10-K 1 d671465d10k.htm 10-K

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-K

☒ | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

☐ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 001-12111

MEDNAX, INC.

(Exact name of registrant as specified in its charter)

FLORIDA |  | 26-3667538
(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.)
1301 Concord Terrace, Sunrise, Florida |  | 33323
(Address of principal executive offices) |  | (Zip Code)

Registrant’s telephone number, including area code (954) 384-0175

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class |  | Name of Each Exchange on Which Registered
Common Stock, par value $.01 per share |  | New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 (d) of the Exchange Act. Yes ☐ No ☒

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒ |  | Accelerated filer ☐ |  | Non-accelerated filer ☐ |  | Smaller reporting company ☐
|  |  |  |  |  | Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

The aggregate market value of shares of Common Stock of the registrant held by non-affiliates of the registrant on June 30, 2018, the last business day of the registrant’s most recently completed second fiscal quarter, was $3,943,237,534 based on a $43.28 closing price per share as reported on the New York Stock Exchange composite transactions list on such date.

The number of shares of Common Stock of the registrant outstanding on February 7, 2019 was 87,920,463.

DOCUMENTS INCORPORATED BY REFERENCE:

The registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A, with respect to the 2019 Annual Meeting of Shareholders is incorporated by reference in Part III of this Form 10-K to the extent stated herein. Except with respect to information specifically incorporated by reference in the Form 10-K, each document incorporated by reference herein is deemed not to be filed as part hereof.

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MEDNAX, INC.

ANNUAL REPORT ON FORM 10-K

For the Year Ended December 31, 2018

INDEX

PART I |  |  |  |  |  |  |  |  |  |
|  |  | Item 1. |  |  | Business |  |  | 3 |
|  |  | Item 1A. |  |  | Risk Factors |  |  | 28 |
|  |  | Item 1B. |  |  | Unresolved Staff Comments |  |  | 44 |
|  |  | Item 2. |  |  | Properties |  |  | 44 |
|  |  | Item 3. |  |  | Legal Proceedings |  |  | 44 |
|  |  | Item 4. |  |  | Mine Safety Disclosures |  |  | 44 |
PART II |  |  |  |  |  |  |  |  |  |
|  |  | Item 5. |  |  | Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities |  |  | 45 |
|  |  | Item 6. |  |  | Selected Financial Data |  |  | 48 |
|  |  | Item 7. |  |  | Management’s Discussion and Analysis of Financial Condition and Results of Operations |  |  | 49 |
|  |  | Item 7A. |  |  | Quantitative and Qualitative Disclosures About Market Risk |  |  | 65 |
|  |  | Item 8. |  |  | Financial Statements and Supplementary Data |  |  | 66 |
|  |  | Item 9. |  |  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure |  |  | 95 |
|  |  | Item 9A. |  |  | Controls and Procedures. |  |  | 95 |
|  |  | Item 9B. |  |  | Other Information |  |  | 96 |
PART III |  |  |  |  |  |  |  |  |  |
|  |  | Item 10. |  |  | Directors, Executive Officers and Corporate Governance |  |  | 97 |
|  |  | Item 11. |  |  | Executive Compensation |  |  | 97 |
|  |  | Item 12. |  |  | Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters |  |  | 97 |
|  |  | Item 13. |  |  | Certain Relationships and Related Transactions, and Director Independence |  |  | 97 |
|  |  | Item 14. |  |  | Principal Accounting Fees and Services |  |  | 98 |
PART IV |  |  |  |  |  |  |  |  |  |
|  |  | Item 15. |  |  | Exhibits, Financial Statement Schedule |  |  | 99 |
|  |  | Item 16. |  |  | Form 10-K Summary |  |  | 103 |

FORWARD-LOOKING STATEMENTS

Certain information included or incorporated by reference in this Form 10-K may be deemed to be “forward-looking statements” which may include, but are not limited to, statements relating to our objectives, plans and strategies, and all statements (other than statements of historical facts) that address activities, events or developments that we intend, expect, project, believe or anticipate will or may occur in the future. These statements are often characterized by terminology such as “believe,” “hope,” “may,” “anticipate,” “should,” “intend,” “plan,” “will,” “expect,” “estimate,” “project,” “positioned,” “strategy” and similar expressions, and are based on assumptions and assessments made by our management in light of their experience and their perception of historical trends, current conditions, expected future developments and other factors they believe to be appropriate. Any forward-looking statements in this Form 10-K are made as of the date hereof, and we undertake no duty to update or revise any such statements, whether as a result of new information, future events or otherwise. Forward-looking statements are not guarantees of future performance and are subject to risks and uncertainties. Important factors that could cause actual results, developments and business decisions to differ materially from forward-looking statements are described in this Form 10-K, including the risks set forth under “Risk Factors” in Item 1A.

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As used in this Form 10-K, unless the context otherwise requires, the terms “MEDNAX,” the “Company,” “we,” “us” and “our” refer to the parent company, MEDNAX, Inc., a Florida corporation, and the consolidated subsidiaries through which its businesses are actually conducted (collectively, “MDX”), together with MDX’s affiliated business corporations or professional associations, professional corporations, limited liability companies and partnerships (“affiliated professional contractors”). Certain subsidiaries of MDX have contracts with our affiliated professional contractors, which are separate legal entities that provide physician services in certain states and Puerto Rico.

PART I

ITEM 1. | BUSINESS

OVERVIEW

MEDNAX is a leading provider of physician services including newborn, anesthesia, maternal-fetal, radiology and teleradiology, pediatric cardiology and other pediatric subspecialty care. At December 31, 2018, our national network comprised over 4,210 affiliated physicians, including 1,270 physicians who provide neonatal clinical care, primarily within hospital-based neonatal intensive care units (“NICUs”), to babies born prematurely or with medical complications. We have 1,315 affiliated physicians who provide anesthesia care to patients in connection with surgical and other procedures, as well as pain management. In addition, we have 365 affiliated physicians who provide maternal-fetal and obstetrical medical care to expectant mothers experiencing complicated pregnancies primarily in areas where our affiliated neonatal physicians practice. Our network also includes other pediatric subspecialists, including 190 physicians providing pediatric intensive care, 110 physicians providing pediatric cardiology care, 140 physicians providing hospital-based pediatric care, 25 physicians providing pediatric surgical care, and 10 physicians providing pediatric ear, nose and throat and pediatric ophthalmology services.

MEDNAX also provides radiology services through a network of over 355 affiliated physicians, as well as teleradiology services through a network of 430 affiliated physicians. In addition to our national physician network, we provide services to healthcare facilities and physicians, including ours, through complementary businesses, consisting of a management services organization focusing on full-service revenue cycle management and a consulting services company.

MEDNAX, Inc. was incorporated in Florida in 2007 and is the successor to Pediatrix Medical Group, Inc., which was incorporated in Florida in 1979. Our principal executive offices are located at 1301 Concord Terrace, Sunrise, Florida 33323 and our telephone number is (954) 384-0175.

OUR PHYSICIAN SPECIALTIES AND SERVICES

The following discussion describes our physician specialties and the care that we provide:

Neonatal Care

We provide clinical care to babies born prematurely or with complications within specific units at hospitals, primarily NICUs, through our network of affiliated neonatal physician subspecialists (“neonatologists”), neonatal nurse practitioners and other pediatric clinicians who staff and manage clinical activities at more than 400 NICUs in 36 states and Puerto Rico. Neonatologists are board-certified, or eligible-to-apply-for-certification, physicians who have extensive education and training for the care of babies born prematurely or with complications that require complex medical treatment. Neonatal nurse practitioners are registered nurses who have advanced training and education in assessing and treating the healthcare needs of newborns and infants as well as managing the needs of their families.

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We partner with our hospital clients in an effort to enhance the quality of care delivered to premature and sick babies. Some of the nation’s largest and most prestigious hospitals, including both not-for-profit and for-profit institutions, retain us to staff and manage their NICUs. Our affiliated neonatologists generally provide 24-hours-a-day, seven-days-a-week coverage in NICUs, support the local referring physician community and are available for consultation in other hospital departments. Our hospital partners benefit from our experience in managing complex intensive care units. Our neonatal physicians interact with colleagues across the country through an internal communications system to draw upon their collective expertise in managing challenging patient-care issues. Our neonatal physicians also work collaboratively with maternal-fetal medicine subspecialists to coordinate the care of mothers experiencing complicated pregnancies and their fetuses.

Anesthesia and Anesthesia Subspecialty Care

We provide anesthesia care at over 150 hospitals, 155 ambulatory surgery centers and office-based practices across 15 states. Following the “care team” model, our affiliated anesthesiologists work with both practice and hospital-employed certified registered nurse anesthetists (“CRNAs”), anesthesiologist assistants (“AAs”) and other clinicians to provide high quality, cost efficient and service-oriented anesthesia care to our patients. Our anesthesiologists are board-certified, or eligible-to-apply-for-certification, physicians who are responsible for administering anesthesia to relieve pain and for managing vital life functions during surgery, including breathing, heart rhythm and blood pressure.

As an integral part of the surgical team, our affiliated anesthesiologists support the surgeons by providing medical care before, during and after surgery so that surgeons may concentrate on the surgical procedure. Our affiliated anesthesiologists provide this care by evaluating the patient and consulting with the surgical team before surgery, providing pain control and support of life functions during surgery, supervising care after surgery by maintaining the patient in a comfortable state during recovery and discharging the patient from the post-anesthesia care unit. They also support other departments within the hospital such as labor and delivery, imaging and the hospital’s emergency room. In addition to their board certification in anesthesiology, many of our affiliated anesthesiologists have completed fellowships in subspecialties such as obstetrical, critical care, cardiac and pediatric anesthesia.

Pain Management

We also provide acute and chronic pain management services in over 30 pain management centers through our network of affiliated physicians and physician assistants. Our affiliated physicians are board-certified in anesthesiology or neurology and board-certified, or eligible-to-apply-for-certification, in pain medicine. This advanced training and education expands treatment options available for both acute and chronic pain sufferers. The physicians develop treatment plans specific to the patients’ individual needs that include interventional techniques such as trigger point and facet injections, pain pumps, nerve stimulators, radiofrequency ablation and catheters, as well as medication management.

Maternal-Fetal Care

We provide inpatient and office-based clinical care to expectant mothers and their unborn babies through our affiliated maternal-fetal medicine subspecialists as well as obstetricians and other clinicians, such as maternal-fetal nurse practitioners, certified nurse mid-wives, ultrasonographers and genetic counselors. Maternal-fetal medicine subspecialists are board-certified, or eligible-to-apply-for-certification, obstetricians who have extensive education and training for the treatment of high-risk expectant mothers and their fetuses. Our affiliated maternal-fetal medicine subspecialists practice primarily in metropolitan areas where we have affiliated neonatologists to provide coordinated care for women with complicated pregnancies whose babies are often admitted to a NICU upon delivery. We believe continuity of treatment from mother and developing fetus during the pregnancy to the newborn upon delivery has improved the clinical outcomes of our patients.

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Pediatric Cardiology Care

We provide inpatient and office-based pediatric cardiology care of the fetus, infant, child and adolescent patient with congenital heart defects and acquired heart disease, as well as adults with congenital heart defects through our affiliated pediatric cardiologist subspecialists and other related clinical professionals such as pediatric nurse practitioners, echocardiographers, other diagnostic technicians, and exercise physiologists. Pediatric cardiologists are board-certified, or eligible-to-apply for certification, pediatricians who have additional education and training in congenital heart defects and pediatric acquired heart disorders.

We provide specialized cardiac care to the fetus, neonatal and pediatric patients with congenital and acquired heart disorders, as well as adults with congenital heart defects, through scheduled office visits, hospital rounds and immediate consultation in emergency situations. Our affiliated pediatric cardiologists work collaboratively with neonatologists and maternal-fetal medicine subspecialists to provide a coordinated continuum of care.

Other Pediatric Subspecialty Care

Our network includes other pediatric subspecialists such as pediatric intensivists, pediatric hospitalists, pediatric surgeons and pediatric ear, nose and throat physicians. In addition, our affiliated physicians seek to provide support services in other areas of hospitals, particularly in the pediatric emergency room, labor and delivery area, and nursery and pediatric departments, where immediate accessibility to specialized care may be critical.

Pediatric Intensive Care. Pediatric intensivists are hospital-based pediatricians with additional education and training in caring for critically ill or injured children and adolescents. Our affiliated physicians who provide this clinical care staff and manage pediatric intensive care units (“PICUs”) at approximately 65 hospitals.

Pediatric Hospitalists. Pediatric hospitalists are hospital-based pediatricians specializing in inpatient care and management of acutely ill children. Our affiliated hospital-based physicians provide this inpatient pediatric and newborn care in PICUs, NICUs and pediatric emergency rooms at approximately 45 hospitals.

Pediatric Surgery. Pediatric surgeons provide specialized care for patients ranging from newborns to adolescents, for all problems or conditions that require surgical intervention, and often have particular expertise in the areas of neonatal, prenatal, trauma, and pediatric oncology. Our affiliated physicians in this subspecialty include pediatric urologists, pediatric plastic and craniofacial surgeons and general and thoracic pediatric surgeons. Areas of particular expertise include management of neonatal and congenital anomalies, prenatal counseling, trauma management, pediatric oncology, gastrointestinal surgery, as well as common pediatric surgical conditions.

Other Newborn and Pediatric Care. Because our affiliated physicians and advanced nurse practitioners generally provide hospital-based coverage, they are situated to provide highly specialized care to address medical needs that may arise during a baby’s hospitalization. For example, as part of our ongoing efforts to support and partner with hospitals and the local referring physician community, our affiliated neonatologists, pediatric hospitalists and advanced nurse practitioners provide in-hospital nursery care to newborns through our newborn nursery program. This program is made available for babies during their hospital stay, which in the case of healthy babies typically consists of evaluation and observation, following which they are referred, and their hospital records are provided, to their pediatricians or family practitioners for follow-up care.

Newborn Hearing Screening Program. Our affiliated physicians also oversee our newborn hearing screening program. Since we launched this program in 1994, we believe that we have become the largest provider of newborn hearing screening services in the United States. In 2018, we screened over 865,000 babies for potential hearing loss at 450 hospitals across the nation. Over 40 states either require newborns to be screened

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for potential hearing loss before being discharged from the hospital or require that parents be offered the opportunity to submit their newborns to hearing screens. We contract or coordinate with hospitals to provide newborn hearing screening services.

Radiology and Teleradiology

Radiology. We provide radiology services including diagnostic imaging, interventional radiology, women’s imaging, cardiac imaging and nuclear medicine, among others, through a network of over 355 affiliated physicians. We believe that we bring a unique value proposition to radiology physician groups, in that we can provide practice management support and a technology platform enabling radiology to be practiced at a national level, as well as teleradiology capabilities that can enhance their efficiency, provide subspecialty access and help them to grow strategically and remain competitive while meeting the demands of their hospital partners, third-party payors and regulatory bodies. In addition, we believe that radiology physicians in a group practice can complement the staffing needs for our teleradiology services business during certain times, such as nights and weekends, when they are not providing services at their practices.

We recently launched two programs: the MEDNAX Radiology Artificial Intelligence Incubator (“AI Incubator”) and the MEDNAX Radiology Centers of Excellence (“Centers of Excellence”). We expect the AI Incubator program to bring together radiologists, a rich and diverse clinical dataset, and a growing ecosystem of partners to build future tools for radiology with the primary goal of improving patient care. Through a strong partnership between clinical and technical leadership as well as a key group of external partners with shared goals, the program aims to improve the overall quality of patient care by increasing radiologists’ accuracy and efficiency, ultimately impacting patient outcomes. The Centers of Excellence program is designed to provide added value to our hospital partners and patients alike, including continuous access to radiologist subspecialty expertise, world-class information technology and quality metrics for patient safety.

Teleradiology. Teleradiology represents a component of the broader radiology industry whereby radiographic images are transmitted from one location to another for interpretation. Through our vRad business, we provide teleradiology services to approximately 2,100 client hospitals, health systems and radiology groups across all 50 states, the District of Columbia and Puerto Rico. With over 430 U.S. board-certified and eligible radiologists currently reading images in the network, the majority of whom are subspecialty trained, we are able to interpret over 6 million patient studies annually and process over 2 billion images on what we believe is the world’s largest and most advanced telemedicine platform, which is covered by more than 18 patents. This telemedicine platform enables referring physicians to quickly and securely pass patient imaging and information to radiologists, improving the speed, accuracy and cost of clinical diagnoses.

We have also invested heavily in cloud-based technology to develop our radiology workflow system that supports the distribution, prioritization and completion of imaging studies. Each component of our radiology workflow system, from our submittal process, to our post-diagnostic analytics and benchmarking capabilities, provides evidence-based insight to help clients make better decisions for the health of patients and their practice of radiology. Our radiology workflow system allows for real-time personal connections between our radiologists and our hospital, health system and radiology group partners.

We believe that teleradiology services are poised for growth and that there are numerous opportunities for cross-selling vRad’s services within MEDNAX’s existing customer base. We believe that teleradiology will play a significant role in the practice of radiology in the future. Our teleradiology business has continued to identify opportunities throughout the country for our radiology physician group practices to expand their presence, and we believe this is becoming a key differentiator as we continue building a broader radiology business.

Management Services Organization

In addition to our national physician network, we provide services nationwide to healthcare facilities and physicians, including ours, through complementary businesses, consisting of a management services organization

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that offers full-service revenue cycle management solutions and innovative technology used for patient/physician connectivity as well as a consulting services company. Our management services organization provides a suite of solutions including a range of patient access and communications, full-service revenue cycle management, consulting and analytics services, billing and coding, patient responsibility, eligibility and disability, complex accounts receivable services such as workers’ compensation, out-of-state Medicaid eligibility and more, and mobile-first engagement and communication software for patients and providers. Our solutions are designed to engage patients, empower physicians and hospitals and other healthcare providers and improve financial outcomes throughout the entire healthcare continuum. We provide these services at more than 2,600 hospitals and other healthcare providers nationwide. In November 2018, we announced the initiation of a process to potentially divest our management services organization to allow us to focus our organization on our core physician services business. However, there can be no assurance that this process will result in a transaction, and we may decide to retain all or part of the management services organization.

Consulting Services

Our perioperative consulting company is comprised of a collaborative team of anesthesiologists, operating room nurse executives and perioperative business strategists who develop and provide solutions to optimize the performance, resources and capacity within hospital operating rooms and across the care continuum. Our services include strategic assessments and transformations, central sterile redesign, physician engagement and governance, and staffing/workforce support. With our peer-to-peer consulting model, we partner with our clients to deliver sustainable and actionable results with the goal of streamlining patient throughput, enhancing anesthesia service levels, increasing surgeon and patient satisfaction, decreasing costs and implementing strategic perioperative growth plans to hospitals and health systems.

Clinical Research, Education, Quality and Safety

As part of our ongoing commitment to improving patient care through evidence-based medicine, we also conduct clinical research, monitor clinical outcomes and implement clinical quality initiatives with a view to improving patient outcomes, shortening the length of hospital stays and reducing long-term health system costs. Our physician-centric approach to clinical research and continuous quality improvement has demonstrated improvements in clinical outcomes, while reducing the costs of care associated with complications as well as variability in protocols. We provide extensive continuing medical education and continuing nursing education to our affiliated clinicians in an effort to ensure that they have access to current treatment methodologies, national best practices and evidence-based guidelines. We believe that referring and collaborating physicians, hospitals, third-party payors and patients all benefit from our clinical research, education, quality and safety initiatives.

DEMAND FOR OUR SERVICES

Hospital-Based Care. Hospitals generally must provide cost-effective, quality care in order to enhance their reputations within their communities and desirability to patients, referring and collaborating physicians and third-party payors. In an effort to improve outcomes and manage costs, hospitals typically employ or contract with physician specialists to provide specialized care in many hospital-based units or settings. Hospitals traditionally staff these units or settings through affiliations with local physician groups or independent practitioners. However, management of these units and settings presents significant operational challenges, including variable admissions rates, increased operating costs, complex reimbursement systems and other administrative burdens. As a result, some hospitals choose to contract with physician organizations that have the clinical quality initiatives, information and reimbursement systems and management expertise required to effectively and efficiently operate these units and settings in the current healthcare environment. Demand for hospital-based physician services, including neonatology and anesthesiology, is determined by a national market in which qualified physicians with advanced training compete for hospital contracts.

Neonatal Medicine. Of the approximately 3.9 million births in the United States annually, we estimate that approximately 14% require NICU admission. Numerous institutions conduct research to identify potential causes

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of premature birth and medical complications that often require NICU admission. Some common contributing factors include the presence of hypertension or diabetes in the mother, lack of prenatal care, complications during pregnancy, drug and alcohol abuse and smoking or poor nutritional habits during pregnancy. Babies admitted to NICUs typically have an illness or condition that requires the care of a neonatologist. Babies who are born prematurely or have a low birth weight often require neonatal intensive care services because of an increased risk for medical complications. We believe obstetricians generally prefer to perform deliveries at hospitals that provide a full complement of labor and delivery services, including a NICU staffed by board-certified, or eligible-to-apply-for-certification, neonatologists. Because obstetrics is a significant source of hospital admissions, hospital administrators have responded to these demands by establishing NICUs and contracting with independent neonatology group practices, such as our affiliated professional contractors, to staff and manage these units. As a result, NICUs within the United States tend to be concentrated in hospitals with higher volumes of births. There are approximately 5,600 board-certified neonatologists in the United States.

Anesthesia Medicine. An estimated 50 million inpatient procedures and 35 million ambulatory procedures are performed annually in the United States. Anesthesiologists generally provide or participate in the administration of anesthetics in these procedures. According to the U.S. Census Bureau, the U.S. population continues to expand and the fastest-growing segment of the population consists of individuals over the age of 65. The growth in population and, in particular the age 65 or greater segment, has resulted in an increase in demand for surgical services and a correlating increase in demand for anesthesia services. The growth of ambulatory surgical centers and expansion of office-based procedures has also contributed to the demand for anesthesia providers. There are approximately 51,000 board certified/eligible anesthesiologists in the United States.

Pain Management. According to the American Academy of Pain Medicine, more than 75 million people suffer from pain and 15% of those who suffer from pain will consult with a pain specialist. As the population ages, we believe that the number of people suffering from acute or chronic pain will continue to increase. Lifestyle also plays an important part in the demand for pain management services. We believe that the combination of the growing population of people who suffer from pain, the lifestyle expectations of this population and the ability for patients to seek out a pain specialist without having to be referred by a physician will increase the demand for pain management services.

Maternal-Fetal Medicine. Expectant mothers with pregnancy complications often seek or are referred by their obstetricians to maternal-fetal medicine subspecialists. These subspecialists provide inpatient and office-based care to women with conditions such as diabetes, heart disease, hypertension, multiple gestation, recurrent miscarriage, family history of genetic diseases, suspected fetal birth defects and other complications during their pregnancies. We believe that improved maternal-fetal care has a positive impact on neonatal outcomes. Data on neonatal outcomes demonstrates that, in general, the likelihood of mortality or an adverse condition or outcome (referred to as “morbidity”) is reduced the longer a baby remains in the womb. There are approximately 2,500 board-certified maternal-fetal medicine subspecialists in the United States.

Pediatric Cardiology Medicine. Pediatric cardiologists provide inpatient and office-based cardiology care of the fetus, infant, child, and adolescent with congenital heart defects and acquired heart disease, as well as providing care to adults with congenital heart defects. We estimate that approximately one in every 125 babies is born with some form of heart defect. With advancements in care, there are approximately 1.4 million adults in the United States today living with congenital heart disease. There are approximately 2,800 board-certified pediatric cardiologists in the United States.

Other Pediatric Subspecialty Medicine. Other areas of pediatric subspecialty medicine are closely associated with maternal-fetal-newborn medical care. For example, pediatric intensivists are subspecialists who care for critically ill or injured children and adolescents in PICUs. There are approximately 2,200 board-certified pediatric intensivists in the United States. As another example, pediatric hospitalists are pediatricians who provide care in many hospital areas, including labor and delivery and the newborn nursery. In addition, pediatric surgeons provide specialized care for patients ranging from newborns to adolescents, for all problems or

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conditions affecting children that require surgical intervention, and often have particular expertise in the areas of neonatal, prenatal, trauma, and pediatric oncology. There are approximately 1,000 board-certified pediatric surgeons in the United States.

Radiology. Radiology is the branch of medical science that uses a variety of medical imaging technology to diagnose injury and disease and sometimes treat diseases in the body. A variety of imaging techniques such as X-ray, fluoroscopy, ultrasound, computed tomography (CT), nuclear medicine, including positron emission tomography (PET), and magnetic resonance imaging (MRI) are used. Interventional radiology is the performance of typically minimally invasive medical procedures with the guidance of imaging technologies. According to the U.S. Census Bureau, the U.S. population continues to expand and the fastest-growing segment of the population consists of individuals over the age of 65. The growth in population and, in particular the age 65 or greater segment, is expected to result in an increase in demand for radiology services as the increased medical needs of this population require more imaging. There are approximately 34,000 board-certified radiologists in the United States.

Teleradiology and Telemedicine. Teleradiology is the transmission of radiographic images from one location to another for interpretation. Teleradiology represents a component of the broader radiology industry. Within this market, teleradiology is a fast growing segment of the physician services sector. We believe that there are several factors prompting growth of the teleradiology model. Around-the-clock subspecialty coverage is becoming a standard of care; the idea that a general radiologist practicing in a single hospital has the ability to read all types of images is no longer prevalent. On behalf of their patients, healthcare facilities increasingly seek to have diagnostic images evaluated by radiologists who have expertise in specific subspecialty areas such as neuroradiology, cardiac imaging and vascular surgery. In addition, facilities wish to have this subspecialty service available to them immediately because timing is critical for treatment and recovery. Advances in technology now make this around-the clock expert attention possible; using remote/onsite integration and data analytics, teleradiologists can read diagnostic images from anywhere at any time and seamlessly deliver results. This not only provides the ability to determine optimal treatment decisions for the patient, but also enhances a healthcare facility’s ability to efficiently and effectively meet its patients’ needs. Since most teleradiology work is completed remotely, the pool of qualified radiologists who are subspecialty trained is significantly greater than would be available in a single geographic area.

Another key driver, we believe, is how we support forward-thinking radiology groups that are attempting to become high-performance providers in their markets. Traditionally, radiology groups have had to staff to their peak volume creating periods where they are overstaffed as volume ramps up or down. With us as a partner, radiology groups can staff to meet typical demand, as opposed to overstaffing, and leverage our solutions for additional coverage at all times, not just the overnight hours. Likewise, radiology groups can more quickly expand their services to other geographies and locations with us as a partner reducing or eliminating the time it takes to recruit physicians for growth. Similarly, teleradiology coverage can be provided for other physician group staffing challenges such as physician retirement and attrition, or to provide expertise in specific subspecialty areas that may not be covered by the physicians in the practice.

Further, we believe there are broader applications across the larger telemedicine industry for the use of the proprietary technology and workflow platform utilized within our teleradiology business. Telemedicine services are well documented as high quality, safe and efficient means of expanding physician services into metropolitan and rural communities. We have begun to expand our services to provide these remote programs to our hospital partners and believe that this will become more relevant as more healthcare providers integrate remote healthcare solutions into their healthcare practices.

Physician Practice Administration. Administrative demands and cost containment pressures from a number of sources, principally commercial and government payors, make it increasingly difficult for physicians to effectively manage patient care, remain current on the latest procedures and efficiently administer non-clinical activities. As a result, we believe that physicians remain receptive to being affiliated with larger organizations

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that reduce administrative burdens, achieve economies of scale and provide value-added clinical research, education and quality initiatives. By relieving many of the burdens associated with the management of a subspecialty group practice, we believe that our practice administration services permit our affiliated physicians to focus on providing quality patient care and thereby contribute to improving patient outcomes, ensuring appropriate length of hospital stays and reducing long-term health system costs. In addition, our national network of affiliated physician practices, modeled around a traditional group practice structure, is managed by a non-clinical professional management team with proven abilities to achieve significant operating efficiencies in providing administrative support systems, interacting with physicians, hospitals and third-party payors, managing information systems and technologies, and complying with applicable laws, rules and regulations.

Management Services / Full-Service Revenue Cycle Management. Our management services organization is designed to help physicians and other healthcare providers better engage patients throughout the entire healthcare continuum by addressing the various challenges that they face from the complexity of reimbursement and practice coordination in today’s healthcare environment. We believe our suite of solutions sets our management services organization apart in the world of healthcare revenue cycle management. Our suite of solutions includes a range of patient access and communications, revenue cycle management, consulting and analytics services, billing and coding, patient responsibility, eligibility and disability, complex accounts receivable services such as workers’ compensation, out-of-state Medicaid eligibility and more, as well as offering advanced technology solutions through mobile-first engagement and communication software for patients and providers. By allowing our organization to step in and handle these areas, hospitals and other healthcare providers can focus on providing care to their patients without the administrative burdens.

The healthcare landscape is changing rapidly, particularly in various areas that hospitals and other healthcare providers typically have not invested in. Our solutions become even more relevant in these specific areas. For example, as patient responsibility balances continue to grow and become harder to collect, our management services organization’s unique process of patient outreach and communication, before the healthcare bills are even sent, is a proven solution to this problem that also enhances patient satisfaction. Our management services organization also helps hospitals and other healthcare providers streamline the eligibility process for Medicaid. Medicaid eligibility is not a simple process to establish, as it differs across states and must be reestablished monthly, and is a critical function as there are millions of individuals who are eligible for Medicaid. We believe that our solutions address the key areas where hospitals and other healthcare providers must adapt to the changes in the business of healthcare.

In November 2018, we announced the initiation of a process to potentially divest our management services organization to allow us to focus our organization on our core physician services business. However, there can be no assurance that this process will result in a transaction, and we may decide to retain all or part of the management services organization.

OUR BUSINESS STRATEGY

Our business objective is to enhance our position as a leading provider of physician and other complementary healthcare services. The key elements of our strategy to achieve this objective are:

| • |  | Build upon core competencies. We have developed significant administrative expertise relating to our practice physician services. We have also facilitated the development of a clinical approach to the practice of medicine among our affiliated physicians through clinical data warehouses that include research, education and quality initiatives intended to advance the practice of medicine and care, improve the quality of care provided to our patients and reduce long-term health system costs. Analysis of the data within our clinical data warehouses across our neonatology, anesthesia and other pediatric subspecialty services allows us to provide feedback to our physicians and hospital partners and to develop and implement best practices, all with the goal of improving outcomes, creating efficiencies and ensuring patient satisfaction. As healthcare organizations are expected to increasingly be held accountable for the

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| quality and cost of the care they provide, we believe that our ability to capture this data within our clinical data warehouses adds value to our patients and our hospital and physician partners.

| • |  | Promote same-unit and organic growth. We seek opportunities for increasing revenue from our hospital- and office-based operations. For example, our affiliated hospital-based neonatal, maternal-fetal and other pediatric physicians are well situated to, and, in some cases, provide physician services in other departments, such as pediatric emergency rooms, newborn nurseries, or in situations where immediate accessibility to specialized obstetric and pediatric care may be critical. Our hospital-based and office-based physicians continue to pursue an organic growth strategy that involves working with our hospital partners to develop integrated service programs for which we become a provider of solutions across the maternal-fetal, newborn, pediatric continuum of care. An integrated program results in a broader offering of care across our specialties and permits the extension of our service lines in our markets. We have successfully executed this organic growth strategy and market partnership in many metropolitan areas and intend to continue this growth initiative in the future. In addition, we market our capabilities to obstetricians, pediatricians and family physicians to attract referrals to our hospital-based units and our office-based practices. We also market the services of our affiliated physicians to other hospitals to attract maternal, neonatal and pediatric transport admissions. In addition, we may pursue new contractual arrangements with hospitals, including possibly through joint ventures, either where we currently provide or do not currently provide physician services.

We have had success developing other programs with our hospital partners. One of these programs relates to obstetric hospitalists (“OB hospitalists”) whereby we have collaborated with hospitals to design programs for which an OB hospitalist is on site at the hospital on a shift basis to provide care for laboring patients and managing obstetrical emergencies. We believe this program is valuable to our hospital partners as the program improves patient safety in part by preventing unattended deliveries and allowing for swifter emergency treatment. An additional benefit from such a program for our hospital partners is that local obstetricians unable to attend deliveries can be confident that there are dedicated in-house obstetricians available to attend such deliveries, and they may therefore choose to deliver at hospitals with such programs.

We also continue to expand our services in telemedicine, which is the use of telecommunication and information technology in order to provide clinical healthcare at a distance. Our acquisition of vRad was a significant milestone in this rapidly evolving area of healthcare and provided us with vRad’s proprietary technology and workflow platform. Similarly, we expect that many pediatric subspecialties as well as maternal-fetal medicine, will benefit in the future from having a robust platform in telemedicine. Telemedicine services are well documented as high quality, safe and efficient means of expanding physician services into metropolitan and rural communities. We have expanded our services to provide these remote programs to our hospital partners. These programs enhance the standing of our hospital partners while creating another portal of entry of pediatric patients to our inpatient service lines.

Additionally, with the goal of further expanding our organic growth strategy, our national sales team pursues opportunities across our service lines by employing a targeting strategy with a specific focus and prioritization. This sales team works with existing hospital and other healthcare partners and also focuses on building new relationships with hospitals and other service providers to which we do not currently provide services in order to offer clinical and other solutions and respond to requests for proposals. Our growth teams are managed under one collaborative group that addresses acquisition and organic growth opportunities with the shared goal of MEDNAX being viewed by hospitals and other partners as a multi-specialty health solutions partner across all of its service lines.

| • |  | Acquire physician practice groups. We continue to seek to expand our operations by acquiring established physician practices in our core physician specialties and pursuing complementary pediatric subspecialty physician groups outside of our core specialties when appropriate. During 2018, we added nine physician group practices, including five radiology practices, two neonatology practices, and two

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| other pediatric subspecialty practices. We currently expect a modest level of acquisition activity during 2019 and intend to primarily focus that acquisition activity in our radiology, neonatology and other pediatric subspecialty service lines.

| • |  | Strengthen and broaden relationships with our partners. By managing many of the operational challenges associated with physician practices, encouraging clinical research, education and quality initiatives, and promoting timely intervention by our physicians, we believe that our business model is focused on improving the quality of care delivered to patients, promoting the appropriate length of their hospital stays and optimizing efficient use of health system resources. We believe that referring and collaborating physicians, hospitals, third-party payors and patients all benefit to the extent that we are successful in implementing our business model. In addition, we will continue to concentrate efforts in becoming more responsive and proactive in broadening our existing hospital relationships to expand the scope of services that we provide across all specialties. We believe this will be critical as hospitals and health systems seek to expand their service offerings and as the broader healthcare market seeks new solutions to operate more efficiently.

| • |  | Focus on Shared Services and Operational Initiatives. We have developed a number of strategic initiatives across our organization, in both our shared services functions and our operational infrastructure, with a goal of generating improvements in our general and administrative expenses and our operational infrastructure. In our shared services departments, we are focused on improving processes, using our resources more efficiently and utilizing our scale more effectively to improve cost and service performance across our operations. Within our operational infrastructure, we have developed specific operational plans within each of our service lines and affiliated physician practices, with specific milestones and regular reporting, with the goal of generating long-term operational improvements and fostering even greater collaboration across our national medical group. We believe these strategic initiatives, together with our continued plans to invest in focused, targeted and strategic organic and acquisitive growth, position us well to deliver a differentiated value proposition to our stakeholders while continuing to provide the highest quality care for our patients.

CLINICAL RESEARCH, EDUCATION, QUALITY AND SAFETY

As part of our patient focus and ongoing commitment to improving patient care through evidenced-based medicine, we engage in clinical research, continuous quality improvement, safety and education initiatives. We discover, understand and teach healthcare practices that enhance the abilities of clinicians to deliver quality care, thereby contributing to better patient outcomes and reduced long-term health system costs. Our investment in these initiatives benefits our patients, clinicians, referring and collaborating physicians, hospital partners and third-party payors. We believe that these initiatives help us, among other things, to enhance the value of our services, attract new and retain existing clinicians, improve clinical operations and enhance practice communication.

| • |  | Clinical Research. We conduct clinical research to discover ways to improve clinical care for our patients and share our discoveries throughout the medical community through submissions to peer-reviewed literature. To help facilitate and support research efforts, MEDNAX established a Research Advisory Committee (RAC). The goal of the RAC is to design, implement and maintain a program for clinical research oversight and support that enables our practices to conduct research that is safe, effective, financially viable and legally compliant, while optimizing research opportunities. The RAC’s multi-disciplinary approach involves the collaboration of both clinical and business professionals, including finance, legal and compliance, and has ultimately enhanced our research efforts and improved overall process flow. With participating clinicians located throughout the country, the RAC supports a comprehensive scope of research efforts, allowing for a more in-depth look at our specialties. This nationwide perspective allows us to better anticipate future needs and opportunities.

| • |  | Quality and Safety. Through the leadership of our affiliated clinicians, we have cultivated a culture of continuous quality improvement and safety, which is the cornerstone of our success and helps us to

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| fulfill our mission. Our team of clinical experts leads and provides oversight for several national quality and safety programs across various specialties and subspecialties.

| • |  | Continuous Quality Improvement (“CQI”). CQI initiatives are important for all of our physician specialties. As part of our dedication to improving quality across our affiliated practices, we provide our clinicians with the opportunity to collaborate and share best practices and facilitate access to valuable information, resources and professional development tools. From these collaborations, our affiliated physicians can identify areas for improvement, and then systematically monitor, study, learn, and implement change. There are several complex initiatives that are derived and based on our long-standing CQI efforts, such as our Regional Resource Teams, our National High Reliability Organization (“HRO”) program and our Performance Improvement Teams. For anesthesia care, we have launched a new Comprehensive Enhanced Recovery after Surgery program and continue to offer a Centers for Medicare and Medicaid Service (“CMS”) certified Qualified Clinical Data Registry (“QCDR”). Our quality metrics are analyzed to include standard clinical outcome reporting, trend analysis and threshold performance, all of which are provided to our individual physicians. The quality committees and medical directors of the practices manage quality improvement programs and drive best practices that are adapted to the needs of the local care setting.

| • |  | Patient Safety Organization (“PSO”). We have established a federally listed PSO, the mission of which is to improve the quality and safety of care rendered by our clinical providers through the collection and analysis of quality data. As a federally listed PSO, our mission to improve the safety of care rendered is supported by the dissemination of best practices information and implementation of patient safety programs. Both our anesthesiology HRO program and women’s and children’s HRO program aim to provide “Just Culture” training to our clinicians. The complex curriculum has been customized to meet our affiliated physician practices’ needs and is based on principles outlined by the Agency for Healthcare Research and Quality (“AHRQ”), Institute for Healthcare Improvement, National Patient Safety Foundation and Team STEPPS, the teamwork system developed by the AHRQ and the Department of Defense.

| • |  | Simulation. Practicing critical decision-making, communication, task and teamwork skills with in situ scenarios promotes optimized clinical performance for high-risk, low-volume critical situations. To meet the needs of our health care providers, hospital and ASC partners, as well as our patients, MEDNAX offers a variety of customized simulation programs with the aim of instilling competence and confidence with one goal in mind: improved outcomes. Our Simulation Program has gained provisional accreditation by the Society for Simulation in Healthcare, a required first step towards attaining full accreditation, and currently offers highly interactive programs for neonatology, anesthesiology and hospital-based medicine practices. The effects of simulation are proven as a performance improvement method and are known to lead to enhanced communication and improved patient outcomes.

| • |  | Education. Our commitment to clinical and research excellence is evidenced by our comprehensive educational and professional development opportunities offered. We provide extensive continuing medical education and continuing nursing education to our affiliated clinicians in an effort to ensure that they have access to current treatment methodologies, national best practices and evidence-based guidelines. As an Accreditation Council for Continuing Medical Education accredited provider, we offer a variety of live and online educational credit opportunities that can be accessed on demand by our providers and are in synergy with latest research publications and healthcare industry standards. We strive to expand our learning materials to new subspecialties. In addition, each year, thousands of healthcare providers worldwide take advantage of educational programs hosted by MEDNAX. We believe that the number of clinicians both nationally and internationally who participate in these activities is evidence of the depth and breadth of our clinical expertise and position as an industry leader.

| • |  | Innovation. We believe collaborative innovation is a pathway towards excellence in research, education, quality and safety. Because of the critical role innovation plays, our team strives to integrate the latest

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| technological advances, artificial or augmented intelligence, genetic discoveries and mobile applications into every day care. Tele- and mobile health, virtual reality, next generation sequencing, point-of-care diagnostics and advanced data analytics are currently shaping the future of medicine. Our team is actively engaged in designing projects that we believe will allow us to prevent disease, offer precision care and further optimize patient outcomes.

We believe that these initiatives have been enhanced by our integrated national presence together with our clinical and management information systems, which are an integral component of our clinical research and education activities. See “Our Information Systems.”

OUR INFORMATION SYSTEMS

We maintain several information systems that support our day-to-day operations, ongoing clinical initiatives and business analysis.

| • |  | BabySteps®. BabySteps is a clinical electronic documentation system used by our affiliated neonatal physicians and other clinicians to record clinical progress notes and certain laboratory and radiology reports and provides a decision tree to assist them in certain situations with the selection of appropriate billing codes.

| • |  | Clinical Data Warehouse. BabySteps enables our affiliated practices to capture a consistent set of clinical information about the patients we treat. We de-identify and transfer information from our electronic health records that reside in BabySteps to our “clinical data warehouse” that since inception has accumulated clinical information on more than 1.4 million patients and 25 million patient days. With comprehensive reporting tools, our physicians are able to use this information to benchmark outcomes, enhance clinical decision-making and advance best practices at the bedside. Using a variety of clinical performance markers, our de-identified data warehouse also helps us track medication and procedure interactions, link treatments to outcomes and identify opportunities to enhance patient outcomes. Our clinical data warehouse also helps us to identify which prospective clinical trials are most important and allows us to monitor the impact of our continuous quality improvement initiatives.

| • |  | MEDNAX Qualified Clinical Data Registry (“QCDR”). MEDNAX QCDR is a quality metric acquisition and database that has been implemented in our anesthesiology, interventional pain and radiology physician practices. QCDR collects patient level data which is then stored, analyzed and reported to physicians and to CMS to address Merit-Based Incentive Payment System (“MIPS”) requirements within the CMS Quality Payment Program. Our affiliated clinicians use the data, along with evidence-based medicine, to develop and implement best practices and standard operating procedures, for educational programs and for providing quality metrics, all with the goal of improving outcomes and efficiency and ensuring patient satisfaction. CMS has certified the MEDNAX QCDR as an appropriate platform for reporting under MIPS, and CMS approved our self-nomination for the 2019 MIPS reporting year.

| • |  | Nextgen®. We have licensed the Nextgen Electronic Medical Record (“EMR”) and Electronic Patient Management (“EPM”) system for our affiliated office-based physicians and other clinicians to record clinical documentation related to their patients and to manage the revenue cycle for our office-based practices. This system has the ability to provide benefits to our office-based practices that are similar to what BabySteps provides to our neonatology practices, including decision trees to assist physicians with the selection of compliant billing codes, promotion of consistent documentation, and data for research and education. We are continuing the process of implementing EMR and EPM throughout our office-based practices.

| • |  | eCCAP. Our electronic charge capture system is used to appropriately record and bill for pediatric intensive care clinicians, hospitalist clinicians and other clinical care providers. We also use administrative data derived from this system to drive quality assurance and quality improvement programs.

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| • |  | Radiology Clinical Data Warehouse. Our extensive database of aggregated and normalized radiology studies powers our sophisticated analytics capabilities. Our analytics technology provides evidence-based insights to our own practice and to key decision makers at hospitals and healthcare systems, as well as to onsite radiology groups regarding optimal staffing, imaging utilization and clinical outcomes, all to help them more efficiently manage their radiology service lines and practices. Our analytics tools are relevant for both hospitals trying to better manage costs and improve operating efficiencies, as well as to radiology groups trying to demonstrate value in an increasingly challenging and evolving healthcare reimbursement environment. Our analytics tools differentiate us as a strategic partner to both existing and new clients who rely on our insight to efficiently manage their radiology service lines and practices.

| • |  | MEDNAX Learning Center®. In addition to providing continuing education, our web-based education platforms also function as important educational adjuncts to our affiliated physician groups, providing a rich source of ongoing medical education for our physicians and enabling physicians to discuss cases with one another through various clinical resources.

Our management information systems are also an integral element of the billing and reimbursement process. We maintain systems that provide for electronic data interchange with payors that accept electronic submissions, including electronic claims submission, insurance benefits verification and claims processing and remittance advice, which enable us to track numerous and diverse third-party payor relationships and payment methods. Our information systems provide scalability and flexibility as payor groups upgrade their payment and reimbursement systems. We continually seek improvements to our systems to expedite the overall process, streamline information gathering from our clinical systems and improve efficiencies in the reimbursement process.

We maintain additional information systems designed to improve operating efficiencies of our affiliated practice groups, reduce physicians’ paperwork requirements and facilitate interaction among our affiliated physicians and their colleagues regarding patient care issues. Following the acquisition of a physician practice group, we implement systematic procedures to improve the acquired group’s operating and financial performance. One of our first steps is to convert a newly acquired group to our broad-based management information system. We also maintain a database management system to assist our business development and recruiting departments to identify potential practice group acquisitions and physician candidates.

PHYSICIAN PRACTICE GROUP ADMINISTRATION

We provide multiple administrative services to support the practice of medicine by our affiliated physicians and strive to improve operating efficiencies of our affiliated practice groups.

| • |  | Unit Management. A senior physician practicing medicine in each physician specialty or subspecialty practice that we manage acts as the medical director for that practice. Each medical director is responsible for the overall management of his or her practice, including staffing and scheduling, quality of care, professional discipline, utilization review, coordinating physician recruitment and monitoring of the financial success within the practice. Medical directors also serve as a liaison with hospital administration, other physicians and the community.

| • |  | Staffing and Scheduling. We assist with staffing and scheduling physicians and advanced practice nurses within the units and practices that we manage. For example, each NICU is staffed by at least one specialist on site or available on call. For our affiliated anesthesia physicians, CRNAs and AAs, we employ an operational system that assists with their staffing and scheduling. We are responsible for managing and coordinating the process for the salaries and benefits paid and provided to our affiliated physicians and practitioners. In addition, we employ, compensate and manage all non-medical personnel for our affiliated physician groups.

| • |  | Recruiting and Credentialing. We have significant experience in locating, qualifying, recruiting and retaining experienced physicians. We maintain an extensive nationwide database of neonatologists,

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| maternal-fetal medicine physicians, anesthesiologists and other pediatric subspecialty physicians and are working to develop such a database for radiologists. Our medical directors and physician leaders play a central role in the recruiting and interviewing process before candidates are introduced to other practice group physicians and hospital administrators. We verify the credentials, licenses and references of all prospective affiliated physician candidates. In addition to our database of physicians, we recruit nationally through trade advertising, referrals from our affiliated physicians and attendance at conferences.

| • |  | Billing, Collection and Reimbursement. We assume responsibility for assisting our affiliated physicians with contracting with third-party payors. We are responsible for billing, collection and reimbursement for services rendered by our affiliated physicians. In all instances, however, we do not assume responsibility for charges relating to services provided by hospitals or other physicians with whom we collaborate. Such charges are separately billed and collected by the hospitals or other physicians. We provide our affiliated physicians and other clinicians with a training curriculum that emphasizes detailed documentation of and compliant coding protocols for all procedures performed and services provided, and we provide comprehensive internal auditing processes, all of which are designed to achieve compliant coding, billing and collection of revenue for physician services. Generally, our billing and collection operations are conducted from our business offices located across the United States and in Puerto Rico, as well as our corporate offices.

| • |  | Risk Management. We maintain a risk management program focused on reducing risk, including the identification and communication of potential risk areas to our medical affairs staff. We maintain professional liability coverage for our national group of affiliated healthcare professionals. Through our risk management and medical affairs staff, we conduct risk management programs for loss prevention and early intervention in order to prevent or minimize professional liability claims.

| • |  | Compliance. We provide a multi-faceted compliance program that is designed to assist our affiliated practice groups in understanding and complying with the increasingly complex laws, rules and regulations that govern the provision of healthcare services.

| • |  | Other Services. We also provide management information systems, facilities management, legal support, marketing support and other services to our affiliated physicians and affiliated practice groups.

RELATIONSHIPS WITH OUR PARTNERS

Our business model, which has been influenced by the direct contact and daily interaction that our affiliated physicians have with their patients, emphasizes a patient-focused clinical approach that addresses the needs of our various “partners,” including hospitals, third-party payors, referring and collaborating physicians, affiliated physicians and, most importantly, our patients.

Hospitals and Other Customers

Our relationships with our hospital partners and other customers are critical to our operations. Hospitals control access to their units and operating rooms through the awarding of contracts and hospital privileges. We have been retained by approximately 570 hospitals to staff and manage clinical activities within specific hospital-based units and other departments. Our affiliated physicians are important components of obstetric, pediatric and surgical services provided at hospitals. Our hospital-based focus enhances our relationships with hospitals and creates opportunities for our affiliated physicians to provide patient care in other areas of the hospital. For example, our physicians may provide care in emergency rooms, nurseries, intensive care units and other departments where access to specialized obstetric, pediatric and anesthesia care may be critical. Our hospital partners benefit from our expertise in managing critical care units and other settings staffed with physician specialists, including managing variable admission rates, operating costs, complex reimbursement systems and other administrative burdens. We work with our hospital partners to enhance their reputation and market our services to referring physicians within the communities served by those hospitals. We also provide radiology

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physician services to hospitals and other physician groups. In addition, our affiliated physicians work with our hospital partners to develop integrated services programs for solutions within the services we provide. Integrated programs provide our hospital partners and us with incremental growth and result in a broader spectrum of care across our specialties and permit us to extend our patient service lines into our existing markets. Our relationships with our hospital partners are continually evolving with the goal of being viewed by them as a solutions provider across all of our specialties.

Under our contracts with hospitals, we have the responsibility to manage, in many cases exclusively, the provision of physician services for hospital-based units, such as NICUs, and other hospital settings. We typically are responsible for billing patients and third-party payors for services rendered by our affiliated physicians separately from other related charges billed by the hospital or other physicians to the same payors. Some of our hospital contracts require hospitals to pay us administrative fees. Some contracts provide for fees if the hospital does not generate sufficient patient volume in order to guarantee that we receive a specified minimum revenue level. We also receive fees from hospitals for administrative services performed by our affiliated physicians providing medical director services at the hospital. Administrative fees accounted for 10% of our net revenue during 2018. Some of our contracts with hospitals require us to indemnify them and their affiliates for losses resulting from the negligence of our affiliated physicians. Our hospital contracts typically have terms of one to three years which can be terminated without cause by either party upon prior written notice, and renew automatically for additional terms of one to three years unless terminated early by any party. While we have in most cases been able to renew these arrangements, hospitals may cancel or not renew our arrangements, or reduce or eliminate our administrative fees in the future.

Third-Party Payors

Our relationships with government-sponsored or funded healthcare programs (“GHC Programs”), including Medicare and Medicaid, and with managed care organizations and commercial health insurance payors are vital to our business. We seek to maintain professional working relationships with our third-party payors, streamline the administrative process of billing and collection, and assist our patients and their families in understanding their health insurance coverage and any balances due for co-payments, co-insurance, deductibles or benefit limitations. In addition, through our quality initiatives and continuing research and education efforts, we have sought to enhance clinical care provided to patients, which we believe benefits third-party payors by contributing to improved patient outcomes and reduced long-term health system costs.

We receive compensation for professional services provided by our affiliated physicians to patients based upon rates for specific services provided, principally from third-party payors. Our billed charges are substantially the same for all parties in a particular geographic area, regardless of the party responsible for paying the bill for our services, but the payments we receive vary among payors. A significant portion of our net revenue is received from GHC Programs, principally state Medicaid and federal Medicare programs.

Medicaid programs, which are jointly funded by the federal government and state governments, pay for medical and health-related services for certain categories of individuals and families generally who have low incomes or disabilities. Medicaid programs can be either standard fee-for-service payment programs or managed care programs in which states have contracted with health insurance companies to run local or state-wide health plans with features similar to health maintenance organizations. Our compensation rates under standard fee-for-service Medicaid programs are established by state governments and are not negotiated. Although Medicaid rates vary across the states, these rates are generally much lower in comparison to private-sector health plan rates. Rates under Medicaid managed care programs typically are negotiated, but are also much lower in comparison to private-sector health plan rates.

The Affordable Care Act (“ACA”) allows states to expand their Medicaid programs to enroll more individuals through federal payments that fund most of the cost of increasing the Medicaid eligibility income limit from a state’s historical eligibility levels to 133% of the federal poverty level. To date, 36 states and the

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District of Columbia have expanded Medicaid eligibility to cover this additional low income patient population (including states that have adopted but not yet implemented expansion and those that are using an alternative approach to eligibility expansion) and other states are considering such expansion. All of the states in which we operate, however, already cover children in the first year of life and pregnant women if their household income is at or below 133% of the federal poverty level. In light of changes to the ACA, some of these states may eliminate, reduce or otherwise modify expanded enrollment eligibility. See Item 1A. Risk Factors — “State budgetary constraints and the uncertainty over the future Medicaid expansion could have an adverse effect on our reimbursement from Medicaid programs” and “The ACA and potential changes to it may have a significant effect on our business.”

Medicare is a health insurance program primarily for individuals 65 years of age and older, younger individuals with certain disabilities and individuals with end-stage renal disease. The program is available without regard to income or assets (with means-tested premiums for beneficiaries with relatively high incomes) and offers beneficiaries different ways to obtain their medical benefits. The most common option selected today by Medicare beneficiaries is the traditional fee-for-service payment system. The other options include managed care, preferred provider organizations, private fee-for-service and specialty plans. Medicare compensation rates are generally much lower in comparison to private-sector health plans. Because we provide services to a wide array of patients, including Medicare beneficiaries, a portion of our patients’ services are reimbursed by Medicare.

In order to participate in government programs, we and our affiliated practices must comply with stringent and often complex standards, including enrollment and reimbursement requirements. Different states also impose varying standards for their Medicaid programs. See “Government Regulation—Government Regulatory Requirements.”

We also receive compensation pursuant to contracts with commercial payors that offer a wide variety of health insurance products, such as health maintenance organizations, preferred provider organizations and exclusive provider organizations that are subject to various state laws and regulations, as well as employer-sponsored coverage subject to federal Employee Retirement Income Security Act (“ERISA”) requirements. We seek to secure mutually agreeable contracts with payors that enable our affiliated physicians to be listed as in-network participants within the payors’ provider networks. We generally contract with commercial payors through our affiliated professional contractors. Subject to applicable laws, rules and regulations, the terms, conditions and compensation rates of our contracts with commercial third-party payors are negotiated and often vary across markets and among payors. In some cases, we contract with organizations that establish and maintain provider networks and then rent or lease such networks to the actual payor. Our contracts with commercial payors typically provide for discounted fee-for-service arrangements and grant each party the right to terminate the contracts without cause upon prior written notice. In addition, these contracts generally give commercial payors the right to audit our billings and related reimbursements for professional and other services provided by or through our affiliated physicians.

If we do not have a contractual relationship with a health insurance payor, we generally bill the payor our full billed charges. If payment is less than billed charges, we bill the balance to the patient, subject to federal and state laws regulating such billing. Although we maintain standard billing and collections procedures with appropriate discounts for prompt payment, we also provide discounts in certain hardship situations where patients and their families do not have financial resources necessary to pay the amount due for services rendered. Any amounts written-off are based on the specific facts and circumstances related to each individual patient account.

Referring and Collaborating Physicians

Our relationships with our referring and collaborating physicians are critical to our success. Our affiliated physicians seek to establish and maintain professional relationships with referring physicians in the communities

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where they practice. Because patient volumes in our NICUs are based in part on referrals from other physicians, particularly obstetricians, it is important that we are responsive to the needs of referring physicians in the communities in which we operate. We believe that our community presence, through our hospital coverage and outpatient clinics, assists referring obstetricians, office-based pediatricians and family physicians with their practices. Our affiliated physicians are able to provide comprehensive maternal-fetal, newborn and pediatric subspecialty care to patients using the latest advances in methodologies, supporting the local referring physician community with 24-hours-a-day, seven-days-a-week on-site or on-call coverage.

Our affiliated anesthesiologists seek to establish and maintain professional relationships with collaborating physicians, such as surgeons, and other healthcare providers. Our affiliated anesthesiologists play an important role for surgeons because they provide medical care to the patient throughout the surgical experience. This care includes evaluation of the patient prior to surgery, consultations with the surgical team, providing pain control and support of life functions during surgery and supervising care following surgery through the discharge of the patient from the recovery unit. Accordingly, our affiliated anesthesiologists are focused on delivering quality services to enhance the reputation and satisfaction of collaborating surgeons.

Affiliated Physicians and Practice Groups

Our relationships with our affiliated physicians are important. Our affiliated physicians are organized in traditional practice group structures. In accordance with applicable state laws, our affiliated practice groups are responsible for the provision of medical care to patients. Our affiliated practice groups are separate legal entities organized under state law as business corporations or professional associations, professional corporations, limited liability companies and partnerships, which we sometimes refer to as our “affiliated professional contractors”. Each of our affiliated professional contractors is owned by a licensed physician affiliated with the Company through employment or another contractual relationship. Our national infrastructure enables more effective and efficient sharing of new discoveries and clinical outcomes data, including best demonstrated processes, access to our sophisticated information systems, clinical research and education.

Our business corporations and affiliated professional contractors employ or contract with physicians to provide clinical services in certain states and Puerto Rico. In most of our affiliated practice groups, each physician has entered into an employment agreement with us or one of our affiliated professional contractors providing for a base salary and incentive bonus eligibility and typically having a term of three to seven years. We are typically responsible for billing patients and third-party payors for services rendered by our affiliated physicians and, with respect to services provided in a hospital, separately from other charges billed by hospitals to the same payors. Each physician must hold a valid license to practice medicine in the state in which he or she provides patient care and must become a member of the medical staff, with appropriate clinical privileges, at each hospital at which he or she practices. Substantially all the physicians employed by us or our affiliated professional contractors have agreed not to compete within a specified geographic area during employment and for a certain period after termination of employment. Although we believe that the non-competition covenants of our affiliated physicians are reasonable in scope and duration and therefore enforceable under applicable state laws, we cannot predict whether a court or arbitration panel would enforce these covenants in any particular case. Our hospital contracts also typically require that we and the physicians performing services maintain minimum levels of professional and general liability insurance. We negotiate those policies and contract and pay the premiums for such insurance on behalf of the physicians.

Each of our affiliated professional contractors has entered into a comprehensive management agreement with a subsidiary of MEDNAX as the manager. Under the terms of these management agreements, and subject to state laws and other regulations, the manager is typically paid for its services based on the performance of the applicable practice group. See “Government Regulation—Fee Splitting; Corporate Practice of Medicine.”

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COMPETITION

The physician services industry is highly fragmented. Competition in our business is generally based upon a number of factors, including reputation, experience and level of care and our affiliated physicians’ ability to provide cost-effective, quality clinical care. The nature of competition for our hospital-based practices, such as neonatology, anesthesiology and radiology, differs significantly from competition for our office-based practices. Our hospital-based practices compete nationally with other health services companies and physician groups for hospital contracts and qualified physicians. In some instances, our hospital-based physicians also compete on a regional or local basis. For example, our neonatologists compete for referrals from local physicians and transports from surrounding hospitals. Our office-based practices, such as maternal-fetal medicine and pediatric cardiology, compete for patients with office-based practices in those subspecialties. In addition, we compete in our teleradiology service line with other teleradiology service providers where costs to provide services may be lower and turnaround times may be faster. We also compete directly with hospitals themselves as they may consider reading images with their own employed radiologists rather than outsource those reads to our affiliated radiologists.

Hospitals control access to their NICUs and operating rooms by awarding contracts and hospital clinical privileges, and our relationships with our hospital partners are critical to our operations. Because our operations consist primarily of physician services provided within hospital-based units, we compete with others for contracts with hospitals to provide services. We also compete with hospitals themselves to provide such services. Hospitals may employ neonatologists, anesthesiologists or radiologists directly or contract with other physician groups to provide services either on an exclusive or non-exclusive basis. A hospital not otherwise competing with us may begin to do so by opening a new NICU or operating facility, expanding the capacity of an existing NICU, adding operating room suites or, in the case of neonatal services, upgrading the level of its existing NICU. If the hospital chooses to do so, it may award the contract to operate the relevant facility to a competing group or company from within or outside the surrounding community. Our contracts with hospitals generally provide that they may be terminated without cause upon prior written notice.

The healthcare industry is highly competitive. Companies in other segments of the industry as well as healthcare-focused and other private equity firms, some of which have financial and other resources greater than ours, may become competitors in providing neonatal, anesthesia, radiology and teleradiology, maternal-fetal and other pediatric subspecialty care.

GOVERNMENT REGULATION

The healthcare industry is governed by a framework of federal and state laws, rules and regulations that are extensive and complex and for which, in many cases, the industry has the benefit of only limited judicial and regulatory interpretation. The resources and costs required to comply with these laws, rules and regulations are high. If we or one of our affiliated practice groups or service businesses is found to have violated these laws, rules or regulations, our business, financial condition and results of operations could be materially, adversely affected. The ACA made numerous changes that have reshaped the United States healthcare delivery system. Further healthcare reform, including potential repeal of or changes to the ACA, continues to attract significant legislative and administrative interest, legal challenges, regulatory and compliance requirements, new approaches and public attention that create uncertainty and the potential for additional changes. Healthcare reform implementation, additional legislation or regulations, and other changes in government policy or regulation may affect our reimbursement, restrict our existing operations, limit the expansion of our business or impose additional compliance requirements and costs, any of which could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. See Item 1A. Risk Factors — “The ACA and potential changes to it may have a significant effect on our business.”

Licensing and Certification

Each state imposes licensing requirements on individual physicians and clinical professionals, and on facilities operated or utilized by healthcare companies like us. Many states require regulatory approval, including

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certificates of need, before establishing certain types of healthcare facilities, offering certain services or expending amounts in excess of statutory thresholds for healthcare equipment, facilities or programs. We and our affiliated physicians are also required to meet applicable Medicare provider requirements under federal laws, rules and regulations and Medicaid provider requirements under federal and state laws, rules and regulations.

Fee Splitting; Corporate Practice of Medicine

Many states have laws that prohibit business corporations, such as MEDNAX, from practicing medicine, employing physicians to practice medicine, exercising control over medical decisions by physicians, or engaging in certain arrangements, such as fee splitting, with physicians. In light of these restrictions, we operate by maintaining long-term management contracts through our subsidiaries with affiliated professional contractors, which employ or contract with physicians to provide physician professional services. Under these arrangements, our manager subsidiaries perform only non-medical administrative services, do not represent that they offer medical services and do not exercise influence or control over the practice of medicine by the physicians employed by the affiliated professional contractors. In states where fee splitting with a business corporation or manager is prohibited, the fees that are received from the affiliated professional contractors have been established on a basis that we believe complies with applicable laws. Although the relevant laws in these states have been subject to limited judicial and regulatory interpretation, we believe that we are in compliance with applicable state laws in relation to the corporate practice of medicine and fee splitting. However, regulatory authorities or other parties, including our affiliated physicians, may assert that, despite these arrangements, we or our manager subsidiaries are engaged in the corporate practice of medicine or that the contractual arrangements with the affiliated professional contractors constitute unlawful fee splitting, in which case we or our affiliated physicians could be subject to administrative, civil or criminal remedies or penalties, the contracts could be found to be legally invalid and unenforceable, in whole or in part, or we could be required to restructure our contractual arrangements with our affiliated professional contractors.

Fraud and Abuse Provisions

Existing federal laws, as well as similar state laws, governing Medicare, Medicaid, other GHC Programs and other non-governmental arrangements and interactions, impose a variety of fraud and abuse prohibitions on healthcare companies like us. These laws are interpreted broadly and enforced aggressively by multiple government agencies, including the Office of Inspector General of the Department of Health and Human Services, the Department of Justice (“DOJ”) and various state agencies.

Federal and state fraud and abuse laws apply to and affect our financial relationships and other ordinary and common business interactions with hospitals, referring physicians and other healthcare entities. In particular, the federal anti-kickback statute makes it a crime to knowingly and willfully solicit, receive, offer, or pay any remuneration, in cash or in kind, in return for either referring items or services for which payment may be made in whole or in part by a GHC Program or purchasing, leasing, ordering, or arranging for or recommending the purchase, lease, or ordering of any service or item for which payment may be made in whole or in part by a GHC Program. In addition, the federal physician self-referral law, commonly known as the “Stark Law,” is a strict liability statute that prohibits a physician from making a referral to an entity for certain “designated health services” if the physician, or an immediate family member, has a financial relationship with that entity, unless an exception applies. The entity is prohibited from billing the Medicare program for designated health services furnished pursuant to a prohibited referral. These laws have been broadly interpreted by federal courts and agencies, and potentially subject many healthcare business arrangements to government investigation, enforcement and prosecution, which can be costly and time consuming. Many of the states in which we operate also have similar anti-kickback and self-referral laws that apply to our government and non-government business.

Violations of these laws are punishable by substantial penalties and other remedies, including monetary fines, civil penalties, administrative remedies, criminal sanctions (in the case of the anti-kickback statute), exclusion from participation in GHC Programs and forfeiture of amounts collected in violation of such laws.

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There are a variety of other types of federal and state fraud and abuse laws, including laws authorizing the imposition of criminal, civil and administrative penalties for submitting false or fraudulent claims for reimbursement to GHC Programs. These laws include the federal civil False Claims Act (“FCA”), which prohibits knowingly presenting, or causing to be presented, false claims to GHC Programs, including Medicare, Medicaid, TRICARE (the program for military dependents and retirees), the Federal Employees Health Benefits Program, and insurance plans purchased through the ACA insurance exchanges where payments include federal funds. Substantial civil fines and treble damages, along with other remedies, including exclusion from GHC Programs, can be imposed for violating the FCA. Furthermore, the FCA does not require that the individual or company that presented or caused to be presented an allegedly false claim have actual knowledge of its falsity. The statute applies where the individual or company acted in “reckless disregard” or in “deliberate ignorance” of the truth or falsity of the claim. The FCA also applies to the improper retention of identified overpayments and includes “whistleblower” provisions that permit private citizens to sue a claimant on behalf of the government and share in the amounts recovered under the law. In recent years, many cases have been brought against healthcare companies by the government and by “whistleblowers,” which have resulted in judgments and settlements involving substantial payments to the government by the companies involved. The cost to defend against allegations can also be substantial.

In addition, the Civil Monetary Penalties Law imposes substantial civil monetary penalties against a person or entity that engages in other prohibited activities, such as presenting or causing to be presented a claim to a GHC Program that the person knows or should know is for an item or service that was not provided as claimed or for a claim that is false or fraudulent, or providing remuneration to a GHC Program beneficiary that the person or entity knows or should know is likely to influence the beneficiary’s selection of a provider or supplier. Regulators also have the authority to exclude individuals and entities from participation in GHC Programs under the Civil Monetary Penalties Law.

The civil and administrative false claims statutes are being applied in a broad range of circumstances. For example, claims for services that are medically unnecessary or fail to meet applicable coverage standards may, under certain circumstances, violate these statutes. Claims for services that were induced by kickbacks and Stark Law violations may also form the basis for FCA liability. Many of the laws and regulations referenced above can be used in conjunction with each other.

If we or our affiliated professional contractors were excluded from participation in any GHC Programs, not only would we be prohibited from submitting claims for reimbursement under such programs, but we also would be unable to contract with other healthcare providers, such as hospitals, to provide services to them. It could also adversely affect our or our affiliated professional contractors’ ability to contract with, or obtain payment from, non-governmental payors.

Although we intend to conduct our business in compliance with all applicable federal and state fraud and abuse laws, many of the laws, rules and regulations applicable to us, including those relating to billing and those relating to financial relationships with physicians and hospitals, are broadly worded and may be interpreted or applied by prosecutorial, regulatory or judicial authorities in ways that we cannot predict. Accordingly, we cannot assure you that our arrangements or business practices will not be subject to government scrutiny or be alleged or found to violate applicable fraud and abuse laws. If there is a determination by government authorities that we have not complied with any of these laws, rules and regulations, our business, financial condition and results of operations could be materially, adversely affected. See “Government Investigations.”

Government Regulatory Requirements

In order to participate in the Medicare program and in the various state Medicaid programs, we and our affiliated physician practices must comply with stringent and often complex regulatory requirements. Moreover, different states impose varying standards for their Medicaid programs. While our compliance program requires that we and our affiliated physician practices adhere to the laws, rules and regulations applicable to the

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government programs in which we participate, our failure to comply with these laws, rules and regulations could negatively affect our business, financial condition and results of operations. See “Government Regulation—Fraud and Abuse Provisions,” “Government Regulation—Compliance Program,” “Government Investigations” and “Other Legal Proceedings,” and Item 1A. Risk Factors — “Government-funded programs, private insurers or state laws and regulations may limit, reduce or make retroactive adjustments to reimbursement amounts or rates,” “We may become subject to billing investigations by federal and state government authorities” and “The healthcare industry is highly regulated, and government authorities may determine that we have failed to comply with applicable laws, rules or regulations.”

In addition, GHC Programs are subject to statutory and regulatory changes, administrative rulings, interpretations and determinations, manual guidance, requirements for utilization review and new governmental funding restrictions, all of which may materially increase or decrease program payments, as well as affect the cost of providing services and the timing of payments to providers. Moreover, because these GHC programs generally provide for reimbursement on a fee-schedule, per-service or per-discharge basis rather than on a charge-related basis, we generally cannot increase our revenue through increases in the amount we charge for our services. To the extent our costs increase, we may not be able to recover our increased costs from these programs, and cost containment measures and market changes in non-governmental insurance plans have generally restricted our ability to recover or shift these increased costs to non-governmental payors. In attempts to limit federal and state spending, there have been, and we expect that there will continue to be, a number of proposals to limit or reduce Medicare and Medicaid reimbursement for various services. Our business may be significantly and adversely affected by any such changes in reimbursement policies and other legislative initiatives aimed at reducing healthcare costs associated with Medicare, Medicaid and other GHC programs.

Our business also could be adversely affected by reductions in or limitations of funding of GHC programs or restrictions on or elimination of coverage for certain individuals or treatments under these programs.

Antitrust

The healthcare industry is subject to close antitrust scrutiny. The Federal Trade Commission (“FTC”), the Antitrust Division of the DOJ and state Attorneys General all actively review and, in some cases, take enforcement action against business conduct and acquisitions in the healthcare industry. Private parties harmed by alleged anticompetitive conduct can also bring antitrust suits. Violations of antitrust laws may be punishable by substantial penalties, including significant monetary fines, civil penalties, criminal sanctions, consent decrees and injunctions prohibiting certain activities or requiring divestiture or discontinuance of business operations. Any of these penalties could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

HIPAA and Other Privacy, Security and Breach Notification Laws

Numerous federal and state laws, rules and regulations govern the collection, dissemination, use, privacy, security and confidentiality of personal information. For example, the federal Health Insurance Portability and Accountability Act of 1996, as amended, and its implementing regulations (collectively, “HIPAA”) impose requirements to protect the privacy and security of protected health information (“PHI”) and to provide notification in the event of a breach of PHI. Violations of HIPAA are punishable by civil money penalties and, in some cases, criminal penalties and imprisonment. The U.S. Department of Health and Human Services (“HHS”) Office for Civil Rights (“OCR”), which is responsible for enforcing HIPAA, also may enter into resolution agreements requiring the payment of a civil money penalty and/or the establishment of a corrective action plan to address violations of HIPAA. OCR may also take other actions short of requiring payment of a civil money penalty or a corrective action plan, such as the provision of technical assistance. As part of our business operations, including in connection with medical record keeping, third-party billing, research and other services, we and our affiliated physician practices collect and maintain PHI regarding patients, which subjects us to compliance with HIPAA requirements.

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Pursuant to HIPAA, HHS has adopted privacy regulations, known as the privacy rule, to govern the use and disclosure of PHI (the “Privacy Rule”). The Privacy Rule applies to “Covered Entities,” which are health plans, health care clearinghouses, and health care providers that engage in standardized transactions under HIPAA, and, as discussed further below, “Business Associates,” which are entities that perform functions or services for or on behalf of Covered Entities that involve the use or disclosure of PHI. The term “Business Associate” also includes “Subcontractors,” which means any entity to whom a Business Associate delegates any function, activity or service, other than in the capacity of a member of the Business Associate’s workforce. PHI is broadly defined as any individually identifiable health information transmitted or maintained in any form, including electronic, paper or oral. As a general rule, a Covered Entity or Business Associate may not use or disclose PHI except as permitted under the Privacy Rule. We have implemented privacy policies and procedures, including training programs, designed to comply with the requirements set forth in the Privacy Rule, as amended to reflect changes required by HITECH, as discussed further below.

HHS has also adopted data security regulations (the “Security Rule”) that require Covered Entities (including health care providers) and Business Associates to implement administrative, physical and technical safeguards to protect the integrity, confidentiality and availability of PHI that is electronically created, received, maintained or transmitted (such as between us and our affiliated practices). We have implemented security policies, procedures and systems, including training programs, designed to comply with the requirements set forth in the Security Rule.

In addition, Congress enacted the Health Information Technology for Economic and Clinical Health (“HITECH”) Act as part of the American Recovery and Reinvestment Act. Among other changes to the laws governing PHI, HITECH required OCR to strengthen and expand HIPAA requirements, increase penalties for violations, give patients new rights to restrict uses and disclosures of their PHI, and impose a number of privacy and security requirements directly on Business Associates, which are now directly subject to penalties under HIPAA as a result of HITECH. Notably, as a result of HITECH, a Covered Entity is liable for violations of HIPAA resulting from the acts or omissions of any Business Associate acting as its agent, as determined by the federal common law of agency.

Under HIPAA, as amended by regulations promulgated pursuant to HITECH, Covered Entities are required to report any unauthorized use or disclosure of PHI that meets the definition of a breach to affected individuals, HHS and, depending on the number of affected individuals, the media for the affected market. In addition, HIPAA requires that Business Associates report breaches to their Covered Entity customers. HITECH further authorizes state Attorneys General to bring civil actions in response to violations of HIPAA that threaten the privacy of state residents. We have adopted breach notification policies and procedures designed to comply with the applicable requirements set forth in HIPAA.

HIPAA establishes a federal “floor” with respect to privacy, security, and breach notification requirements and does not supersede any state laws insofar as they are broader or more stringent than HIPAA. Numerous state and certain other federal laws protect the confidentiality of patient information and other personal information, including but not limited to state medical privacy laws, state laws protecting personally identifiable information, state data breach notification laws, state genetic privacy laws, human subjects research laws and federal and state consumer protection laws.

These requirements are also subject to change. Compliance with new privacy, security, and breach notification laws, regulations and requirements may result in increased operating costs, and may constrain or require us to alter our business model or operations. For example, changes to HIPAA promulgated pursuant to HITECH further restricted our ability to collect, disclose and use PHI and imposed additional compliance requirements on us.

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HIPAA Transaction Requirements

In addition to privacy, security, and breach notifications requirements, HIPAA establishes uniform electronic data transmission standards that all healthcare providers must use for electronic healthcare transactions. For example, claims for reimbursement that are transmitted electronically to third-party payors must comply with specific formatting standards, and these standards apply whether the payor is a government or a private entity. We report medical diagnoses under International Classification of Diseases, 10th Edition (“ICD-10”). If claims are not reported properly under ICD-10 due to technical or coding errors or other implementation issues involving systems, including ours and those of our third-party payors, there can be a delay in the processing and payment of such claims, or a denial of such claims, which could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

Environmental Regulations

Our healthcare operations generate medical waste that must be disposed of in compliance with federal, state and local environmental laws, rules and regulations. Our office-based operations are subject to compliance with various other environmental laws, rules and regulations. Such compliance does not, and we anticipate that such compliance will not, materially affect our capital expenditures, financial position or results of operations.

Compliance Program

We maintain a compliance program that includes the established elements of an effective program and reflects our commitment to complying with all laws, rules and regulations applicable to our business and that meets our ethical obligations in conducting our business (the “Compliance Program”). We believe our Compliance Program provides a solid framework to meet this commitment and our obligations as a provider of healthcare services, including:

| • |  | a Chief Compliance Officer who reports to the Board of Directors on a regular basis;

| • |  | a Compliance Committee consisting of our senior executives;

| • |  | a formal internal audit function, including a Senior Director of Internal Audit who reports to the Audit Committee on a regular basis;

| • |  | our Code of Conduct, which is applicable to our employees, independent contractors, officers and directors;

| • |  | our Code of Professional Conduct – Finance, which is applicable to our finance personnel, including our Chief Executive Officer, Chief Financial Officer and Chief Accounting Officer;

| • |  | a disclosure program that includes a mechanism to enable individuals to disclose on a confidential or anonymous basis to the Chief Compliance Officer or any person who is not in the disclosing individual’s chain of command, issues or questions believed by the individual to be a potential violation of criminal, civil, or administrative laws or of company policies or procedures;

| • |  | an organizational structure designed to integrate our compliance objectives into our corporate offices, regions and practices; and

| • |  | education, monitoring and corrective action programs designed to establish methods to promote the understanding of our Compliance Program and adherence to its requirements.

The foundation of our Compliance Program is our Code of Conduct, which is intended to be a comprehensive statement of the ethical and legal standards governing the daily activities of our employees, affiliated professionals, independent contractors, officers and directors. All of our personnel are required to abide by, and are given thorough education regarding, our Code of Conduct. In addition, all employees and affiliated

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professionals are expected to report incidents that they believe in good faith may be in violation of our Code of Conduct. We maintain a toll-free helpline to permit individuals to report compliance concerns on an anonymous basis and obtain answers to questions about our Code of Conduct. Our Compliance Program, including our Code of Conduct, is administered by our Chief Compliance Officer with oversight by our Chief Executive Officer, Compliance Committee and Board of Directors. Copies of our Code of Conduct and our Code of Professional Conduct – Finance are available on our website, www.mednax.com. Our internet website and the information contained therein or connected thereto are not incorporated into or deemed a part of this Form 10-K. Any amendments or waivers to our Code of Professional Conduct – Finance will be promptly disclosed on our website following the date of any such amendment or waiver.

GOVERNMENT INVESTIGATIONS

We expect that audits, inquiries and investigations from government authorities, agencies, contractors and payors will occur in the ordinary course of business. Such audits, inquiries and investigations and their ultimate resolutions, individually or in the aggregate, could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

OTHER LEGAL PROCEEDINGS

In the ordinary course of our business, we become involved in pending and threatened legal actions and proceedings, most of which involve claims of medical malpractice related to medical services provided by our affiliated physicians. Our contracts with hospitals generally require us to indemnify them and their affiliates for losses resulting from the negligence of our affiliated physicians and other clinicians. We may also become subject to other lawsuits that could involve large claims and significant defense costs. We believe, based upon a review of pending actions and proceedings, that the outcome of such legal actions and proceedings will not have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. The outcome of such actions and proceedings, however, cannot be predicted with certainty and an unfavorable resolution of one or more of them could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

In July 2018, a securities class action lawsuit was filed against us and certain of our officers and one of our directors in the U.S. District Court for the Southern District of Florida (Case No. 0:18-cv-61572-WPD) that purports to state a claim for alleged violations of Sections 10(b) and 20(a) of the Exchange Act, and Rule 10b-5 thereunder, based on statements made by the defendants primarily concerning our anesthesiology business. The complaint seeks unspecified damages, interest, attorneys’ fees and other costs. We believe this lawsuit to be without merit and intend to vigorously defend against it. The lawsuit is in the very early stages and, at this time, no assessment can be made as to its likely outcome or whether the outcome will be material to us.

Although we currently maintain liability insurance coverage intended to cover professional liability and certain other claims, we cannot ensure that our insurance coverage will be adequate to cover liabilities arising out of claims asserted against us in the future where the outcomes of such claims are unfavorable to us. With respect to professional liability risk, we self-insure a significant portion of this risk through our wholly owned captive insurance subsidiary. Liabilities in excess of our insurance coverage, including coverage for professional liability and certain other claims, could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. See “Professional and General Liability Coverage.”

PROFESSIONAL AND GENERAL LIABILITY COVERAGE

We maintain professional and general liability insurance policies with third-party insurers generally on a claims-made basis, subject to deductibles, self-insured retention limits, policy aggregates, exclusions, and other restrictions, in accordance with standard industry practice. We believe that our insurance coverage is appropriate based upon our claims experience and the nature and risks of our business. However, we cannot predict whether

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any pending or future claim would be successful or, if successful, would not exceed the limits of available insurance coverage.

Our business entails an inherent risk of claims of medical malpractice against our affiliated physicians, clinicians and us. We contract and pay premiums for professional liability insurance that indemnifies us and our affiliated healthcare professionals generally on a claims-made basis for losses incurred related to medical malpractice litigation. Professional liability coverage is required in order for our affiliated physicians to maintain hospital privileges. Our self-insured retention under our professional liability insurance program is maintained primarily through a wholly owned captive insurance subsidiary. We record estimates in our Consolidated Financial Statements for our liabilities for self-insured retention amounts and claims incurred but not reported based on an actuarial valuation using historical loss information, claim emergence patterns and various actuarial assumptions. Liabilities for claims incurred but not reported are not discounted. Because many factors can affect historical and future loss patterns, the determination of an appropriate reserve involves complex, subjective judgment, and actual results may vary significantly from estimates. If the self-insured retention amounts and other amounts that we are actually required to pay materially exceed the estimates that have been reserved, our financial condition, results of operations and cash flows could be materially, adversely affected.

EMPLOYEES AND PROFESSIONALS UNDER CONTRACT

In addition to the 4,210 practicing physicians affiliated with us as of December 31, 2018, we employed or contracted with approximately 4,250 other clinical professionals and approximately 7,625 other full-time and part-time employees.

GEOGRAPHIC COVERAGE

We provide physician services across all 50 states, the District of Columbia and Puerto Rico. In addition, through our complementary service businesses, we provide full service revenue cycle management and consulting services to healthcare facilities and physicians nationwide. During 2018, approximately 52% of our net revenue was generated by operations in our five largest states. Our operations in Texas accounted for approximately 20% of our net revenue for the same period. Although we continue to seek to diversify the geographic scope of our operations, primarily through acquisitions of physician group practices, we may not be able to implement successfully or realize the expected benefits of any of these initiatives. Adverse changes or conditions affecting states in which our operations are concentrated, such as healthcare reforms, changes in laws, rules and regulations, reduced Medicare or Medicaid reimbursements, an increase in the income level required to qualify for government healthcare programs or government investigations, may have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

SERVICE MARKS

We have registered with the United States Patent and Trademark Office the service marks “MEDNAX National Medical Group and Design,” “Pediatrix Medical Group and Design,” “Obstetrix Medical Group and Design,” “American Anesthesiology and Design,” “BabySteps,” the “Baby Design,” “Quality Steps,” “iNewborn,” “NEO Conference and Design,” “MedData” and “vRad,” among others.

AVAILABLE INFORMATION

Our annual proxy statements, annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those statements and reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934 are available free of charge and may be printed out through our internet website, www.mednax.com, as soon as reasonably practicable after we electronically file such material with, or furnish it to, the SEC. Our proxy statements and reports may also be obtained directly from the SEC’s Internet website at www.sec.gov. Our internet website and the information contained therein or connected thereto are not incorporated into or deemed a part of this Form 10-K.

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ITEM 1A. | RISK FACTORS

Our business is subject to a number of factors that could materially affect future developments and performance. In addition to factors affecting our business that have been described elsewhere in this Form 10-K, any of the following risks could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

Economic conditions could have an adverse effect on our business.

Our operations and performance depend significantly on economic conditions. During the year ended December 31, 2018, the percentage of our patient service revenue being reimbursed under GHC Programs remained relatively consistent as compared to the year ended December 31, 2017. If, however, economic conditions in the United States deteriorate, we could experience shifts toward GHC Programs, and patient volumes could decline. Further, we could experience and have experienced shifts toward GHC Programs if changes occur in population demographics within geographic locations in which we provide services. We have also experienced, and expect to continue to experience, a shift toward GHC Programs in anesthesia care. Adverse economic conditions could also lead to additional increases in the number of unemployed and under-employed workers and a decline in the number of private employers that offer healthcare insurance coverage to their employees. Employers that do offer healthcare coverage may increase the required contributions from employees to pay for their coverage and increase patient responsibility amounts. In addition, certain private payors’ poor experience with the healthcare insurance exchanges and uncertainty around the future of the ACA and healthcare insurance exchanges may result in those payors exiting the healthcare insurance exchange marketplaces or the cessation of the healthcare insurance exchanges. As a consequence, the number of patients who participate in GHC Programs or who are uninsured or underinsured could increase. Payments received from GHC Programs are substantially less than payments received from private healthcare insurance programs (managed care and other third-party payors). Payments under policies issued through the healthcare insurance exchanges may be less than payments from private healthcare insurance programs and in some cases, patients’ responsibility for costs related to healthcare plans obtained through the healthcare insurance exchanges may be high and could increase in the future, and we may experience increased bad debt due to patients’ inability to pay for certain services. A payor mix shift from private healthcare insurance programs to GHC Programs or to healthcare insurance exchanges may result in an increase in our estimated provision for contractual adjustments and uncollectibles and a corresponding decrease in our net revenue, as well as a significant reduction in our average reimbursement rates. While we have developed a number of strategic initiatives across our organization, in both our shared services functions and our operational infrastructure, to address some of the effects of changes in economic conditions, there is no assurance that these initiatives will be successful in generating improvements in our general and administrative expenses and our operational infrastructure. If these initiatives are unsuccessful, it could have a material adverse effect on our financial condition, results of operations, cash flows and the trading price of our securities.

The ACA and potential changes to it may have a significant effect on our business.

The ACA contains a number of provisions that have affected us and may continue to affect us over the next several years. These provisions include the establishment of health insurance exchanges to facilitate the purchase of qualified health plans, expanded Medicaid eligibility, subsidized insurance premiums and additional requirements and incentives for businesses to provide healthcare benefits. Moreover, we could be affected by potential changes to various aspects of the ACA, including subsidies, healthcare insurance marketplaces and Medicaid expansion.

The ACA remains subject to continuing legislative and administrative flux and uncertainty. In 2017, Congress unsuccessfully sought to replace substantial parts of the ACA with different mechanisms for facilitating insurance coverage in the commercial and Medicaid markets. Additionally, CMS has administratively revised a number of provisions and may seek to advance additional significant changes through regulation, guidance and

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enforcement in the future. At the end of 2017, Congress repealed part of the ACA that required most individuals to purchase and maintain health insurance or face a tax penalty, known as the individual mandate. In December 2018, a federal judge in Texas declared that key portions of the ACA were inconsistent with the United States Constitution and specifically that the ACA cannot stand on its own since Congress repealed the individual mandate. Several states are now engaged in appealing this decision. It is possible that as a result of these actions, enrollment in healthcare exchanges declined during 2018.

If the ACA is repealed or further substantially modified, or if implementation of certain aspects of the ACA are diluted or delayed, such repeal, modification or delay may impact our business, financial condition, results of operations, cash flows and the trading price of our securities. We are unable to predict the impact of any repeal, modification or delay in the implementation of the ACA, including the repeal of the individual mandate, on us at this time.

In addition to the potential impacts to the ACA under the current Administration, there could be more sweeping changes to GHC Programs, such as a change in the structure of Medicaid by converting it into a block grant or instituting “per capita caps,” which could eliminate the guarantee that everyone who is eligible and applies for benefits would receive them and could potentially give states sweeping new authority to restrict eligibility, cut benefits and make it more difficult for people to enroll. Additionally, several states are considering and pursuing changes to their Medicaid programs, such as requiring recipients to engage in employment activities as a condition of eligibility for most adults, disenrolling recipients for failure to pay a premium, or adjusting premium amounts based on income.

We cannot ultimately predict with any assurance the ultimate effect of these laws and resulting changes to payments under GHC Programs, nor can we provide any assurance that they will not have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. Further, any fiscal tightening impacting GHC Programs or changes to the structure of any GHC Programs could have a material adverse effect on our financial condition, results of operations, cash flows and the trading price of our securities.

The Medicare Access and CHIP Reauthorization Act of 2015 (“MACRA”) and potential changes to it may have a significant effect on our business.

MACRA contains numerous measures that could affect us, including, requirements that physicians participate in quality measurement programs that differentiate payments to physicians under Medicare based on quality and cost of care, rather than the quantity of procedures performed. MACRA requires physicians to choose to participate in one of two payment formulas, MIPS or Alternative Payment Models (“APMs”). Beginning in 2019, MIPS will allow eligible physicians to receive incentive payments based on the achievement of certain quality and cost metrics, among other measures, and be reduced for those who are underperforming against those same metrics and measures. As an alternative, physicians can choose to participate in an Advanced APMs, and physicians who are meaningful participants in APMs will receive bonus payments from Medicare pursuant to the law. MACRA also remains subject to review and potential modification by Congress, as well as shifting regulatory requirements established by CMS. We currently anticipate that our affiliated physicians will be eligible to receive bonus payments in 2019 through participation in the MIPS, although the amounts of such bonus payments are not expected to be material. We will continue to operationalize the provisions of MACRA and assess any further changes to the law or additional regulations enacted pursuant to the law.

We cannot ultimately predict with any assurance the ultimate effect of these laws and resulting changes to payments under GHC Programs, nor can we provide any assurance that they will not have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. Further, any fiscal tightening impacting GHC Programs or changes to the structure of any GHC Programs could have a material adverse effect on our financial condition, results of operations, cash flows and the trading price of our securities.

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State budgetary constraints and the uncertainty over the future of Medicaid could have an adverse effect on our reimbursement from Medicaid programs.

Congress and the current Administration have expressed interest in repealing, and have attempted to repeal, the ACA and substantially reform the Medicaid program. Congress could, for example, repeal the provisions of the ACA that encouraged states to expand Medicaid eligibility to more adults, including additional federal matching funds that enabled states to do so. The ACA allowed states to expand their Medicaid programs through federal payments that fund most of the cost of increasing the Medicaid eligibility income limit from a state’s historic eligibility levels to 133% of the federal poverty level. As of December 31, 2018, 36 states and the District of Columbia implemented the expansion of Medicaid eligibility. All of the states in which we operate, however, already cover children in the first year of life and pregnant women if their household incomes are at or below 133% of the federal poverty level. If states that expanded Medicaid reduce or eliminate eligibility for certain individuals, the number of patients who are uninsured could increase. Some states may seek to maintain expanded eligibility and to do so could offset the cost by further reducing payments to providers of services. In some states, we could experience delayed or reduced Medicaid payment for services furnished to program enrollees.

Congress and the current Administration are also seeking substantial reforms to Medicaid law to grant states more autonomy and discretion to design Medicaid programs. These changes, if enacted, could reduce or eliminate eligibility for certain individuals, or allow states to reduce payments to providers of services. As a result, in some states, we could experience an increase in the number of uninsured patients and delayed or reduced Medicaid payment for services furnished to program enrollees.

The 2018 mid-term elections in November 2018 changed the balance of power in Congress and may change the direction of future health-related legislation. More recently, a federal judge in Texas declared that key portions of the ACA were inconsistent with the United States Constitution and specifically that the ACA cannot stand on its own since Congress repealed the individual mandate. Several states are now engaged in appealing this decision.

In addition, many states are continuing to collect less tax revenue than they did historically and as a consequence continue to face budget shortfalls and underfunded pension and other obligations. Although shortfalls have been declining in more recent budgetary years, they are still significant by historical standards. The financial condition of the states in which we do business could lead to reduced or delayed funding for Medicaid programs and, in turn, reduced or delayed reimbursement for physician services, which could adversely affect our results of operations, cash flows and financial condition.

The birth rate in the United States has declined and may decline further.

Final birth data for 2017 indicate that total births in the United States declined by approximately 2% as compared to 2016. Provisional data for 2018 is not yet available; however, we expect that birth trends at the hospitals where we provide services will continue to be soft in the near future. Future declines in births are possible and could have an adverse effect on our patient volumes, net revenue, results of operations, cash flows and financial condition.

Expanding eligibility of GHC Programs could adversely affect our reimbursement.

In January 2018, Congress reauthorized the Children’s Health Insurance Program (“CHIP”) through 2023 and then in February 2018 lengthened this funding extension through 2027. Changes to CHIP or the ACA’s expansion of Medicaid coverage could cause patients who otherwise would have participated in private healthcare insurance programs to participate in GHC Programs, or vice versa, or cause patients who otherwise would have been covered by CHIP or Medicaid to lose insurance coverage altogether. Additional reform efforts, as well as legislative or administrative amendment or repeal of the ACA, could change the eligibility

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requirements for Medicaid and for other GHC Programs, including CHIP, and could increase the number of patients who participate in such programs or the number of uninsured patients. In general, payments received from GHC Programs are substantially less than payments received from private healthcare insurance programs (managed care and other third-party payors). A shift in the mix of our payors from private healthcare insurance programs to government payors may result in an increase in our estimated provision for contractual adjustments and uncollectibles and a corresponding decrease in our net revenue, as well as a significant reduction in our average reimbursement rates. Additionally, if Congress does not act to extend CHIP beyond 2027, or if Congress extends CHIP but substantially alters the current program, we could be adversely affected if children in states where we do business lose Medicaid coverage or payments for services furnished to these children are delayed or reduced.

Government-funded programs, private insurers or state laws and regulations may limit, reduce or make retroactive adjustments to reimbursement amounts or rates.

A significant portion of our net revenue is derived from payments made by GHC Programs, principally Medicare and Medicaid. These government-funded programs, as well as private insurers, have been and may continue to be subject to changes, including increased use of managed care organizations, value-based purchasing, and new patient care models to control the cost, eligibility for, use and delivery of healthcare services as a result of budgetary constraints and cost containment pressures due to unfavorable economic conditions, rising healthcare costs and for other reasons, including those described above under Item 1. Business—“Government Regulation—Government Regulatory Requirements.” Federal and state legislatures or administrators of these government-funded programs and private insurers may attempt other measures to control costs, including bundling of services and denial of, or reduction in, reimbursement for certain services and treatments. In addition, increased consolidation among private insurers is resulting in fewer and larger third-party payors with increased negotiating power. As a result, payments from government programs or private payors may decrease significantly. Also, any adjustment in Medicare reimbursement rates may have a detrimental impact on our reimbursement rates not only for Medicare patients, but also for patients covered under Medicaid and other third-party payors, because a state’s Medicaid payments cannot exceed the payments it would have made had those patients been enrolled in traditional Medicare, and other third-party payors often base their reimbursement rates on a percentage of Medicare rates. Our business may also be materially affected by limitations on, or reductions in, reimbursement amounts or rates or elimination of coverage for certain individuals or treatments. Moreover, because government-funded programs generally provide for reimbursements on a fee-schedule basis rather than on a charge-related basis, we generally cannot increase our revenue from these programs through increases in the amount we charge for our services. To the extent our costs increase, we may not be able to recover our increased costs from these programs, and cost containment measures and market changes in non-government-funded insurance plans have generally restricted our ability to recover, or shift to non-governmental payors, these increased costs. In addition, funds we receive from third-party payors are subject to audit with respect to the proper billing for physician and ancillary services and, accordingly, our revenue from these programs may be adjusted retroactively. Any retroactive adjustments to our reimbursement amounts could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

In addition, our agreements with certain third-party payors may be terminated for various reasons, requiring us to seek reimbursement as an out-of-network provider. In the event we attempt to balance-bill patients, we may be limited in our ability to do so by certain state laws and regulations. As these laws and regulations continue to develop in certain states, it could incentivize certain third-party payors to terminate agreements as a business strategy which could lower overall reimbursement to providers. Any reductions in reimbursement amounts could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. Further, if a federal government shutdown were to occur for a prolonged period of time, federal government payment obligations, including its obligations under Medicaid and Medicare, may be delayed. Similarly, if state government shutdowns were to occur, state payment obligations may be delayed. If

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the federal or state governments fail to make payments under these programs on a timely basis, our business could suffer, and our financial position, results of operations or cash flows may be materially affected.

We may become subject to billing investigations by federal and state government authorities and private insurers.

Federal and state laws, rules and regulations impose substantial penalties, including criminal and civil fines, monetary penalties, exclusion from participation in government healthcare programs and imprisonment, on entities or individuals (including any individual corporate officers or individual providers deemed responsible) that fraudulently or wrongfully bill government-funded programs or other third-party payors for healthcare services. CMS requires states to maintain a Medicaid Recovery Audit Contractor (“RAC”) program. States are required to contract with one or more eligible Medicaid RACs to review Medicaid claims for any overpayments or underpayments, and to recoup overpayments from providers on behalf of the state. In addition, federal laws, along with a growing number of state laws, allow a private person to bring a civil action in the name of the government for false billing violations. See Item 1. Business—“Government Regulation—Fraud and Abuse Provisions.” Moreover, the current Administration has expressed a desire to increase scrutiny of providers and payments for services to further minimize fraud and abuse of the program. In addition, our contracts with private insurers often provide such insurers with audit rights over payments made to us and the ability to seek recoupment for overpayments. We believe that audits, inquiries and investigations from government agencies and private insurers will occur from time to time in the ordinary course of our business, which could result in substantial costs to us and a diversion of management’s time and attention. New regulations and heightened enforcement activity also could materially affect our cost of doing business and our risk of becoming the subject of an audit or investigation. We cannot predict whether any future audits, inquiries or investigations, or the public disclosure of such matters, likely would have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. See Item 1. Business—“Government Investigations.”

The healthcare industry is highly regulated, and government authorities may determine that we have failed to comply with applicable laws, rules or regulations.

The healthcare industry and physicians’ medical practices, including the healthcare and other services that we and our affiliated physicians provide, are subject to extensive and complex federal, state and local laws, rules and regulations, compliance with which imposes substantial costs on us. Of particular importance are the provisions summarized as follows:

| • |  | federal laws (including the federal FCA) that prohibit entities and individuals from intentionally (or with reckless disregard or deliberate ignorance) presenting or causing to be presented false or fraudulent claims to Medicare, Medicaid and other government-funded programs, or improperly retaining known overpayments;

| • |  | a provision of the Social Security Act, commonly referred to as the “anti-kickback” statute, that prohibits the knowing and willful offer, payment, solicitation or receipt of any bribe, kickback, rebate or other remuneration, in cash or in kind, in return for the referral or recommendation of patients for, or for the purchasing, leasing, ordering or arranging for, items and services for which payment may be made, in whole or in part, by federal healthcare programs, such as Medicare and Medicaid;

| • |  | a provision of the Social Security Act, commonly referred to as the Stark Law, that, subject to certain exceptions, prohibits physicians from making a referral to an entity for certain “designated health services” if the physician, or an immediate family member, has a direct or indirect financial relationship (including a compensation arrangement) with the entity;

| • |  | similar state law provisions pertaining to anti-kickback, fee splitting, self-referral and false claims, which typically are not limited to relationships involving government-funded programs;

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| • |  | provisions of HIPAA that prohibit knowingly and willfully executing a scheme or artifice to defraud a healthcare benefit program or falsifying, concealing or covering up a material fact or making any material false, fictitious or fraudulent statement in connection with the delivery of or payment for healthcare benefits, items or services;

| • |  | federal and state laws related to confidentiality, privacy and security of personal information, including medical information and records, that limit the manner in which we may use and disclose that information, impose obligations to safeguard that information and require that we notify third parties in the event of a breach;

| • |  | state laws that prohibit general business corporations from practicing medicine, controlling physicians’ medical decisions or engaging in certain practices, such as splitting fees with physicians;

| • |  | federal and state laws governing participation in GHC Programs could result in denial of our application to become a participating provider or revocation of our participation or billing privileges, which in turn, could cause us to not be able to treat patients covered by the applicable program or prohibit us from billing for the treatment services provided to such patients;

| • |  | federal and state laws that prohibit providers from billing and receiving payment from Medicare and Medicaid for services unless the services are medically necessary, adequately and accurately documented and billed using codes that accurately reflect the services rendered;

| • |  | federal and state laws pertaining to the provision and coverage of services by non-physician practitioners, such as advanced nurse practitioners, physician assistants and other clinical professionals, physician supervision of such services and reimbursement requirements that may be dependent on the manner in which the services are provided and documented; and

| • |  | federal laws that impose civil administrative sanctions for, among other violations, inappropriate billing of services to federal healthcare programs, inappropriately reducing hospital inpatient lengths of stay for such patients, or employing individuals who are excluded from participation in federally funded healthcare programs.

In addition, we believe that our business will continue to be subject to increasing regulation, the scope and effect of which we cannot predict. See Item 1. Business—“Government Regulation.”

We may in the future become the subject of regulatory or other investigations, audits or proceedings, and our interpretations of applicable laws, rules and regulations may be challenged. For example, regulatory authorities or other parties may assert that our arrangements with our affiliated professional contractors constitute fee splitting or the corporate practice of medicine and seek to invalidate these arrangements, which could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. See Item 1. Business—“Government Regulation—Fee Splitting; Corporate Practice of Medicine.” Regulatory authorities or other parties also could assert that our relationships, including fee arrangements, among our affiliated professional contractors, hospital clients or referring physicians violate the anti-kickback, fee splitting or self-referral laws and regulations or that we have submitted false claims or otherwise failed to comply with government program reimbursement requirements. See Item 1. Business—“Government Regulation—Fraud and Abuse Provisions” and “—Government Regulatory Requirements.” Such investigations, proceedings and challenges could result in substantial defense costs to us and a diversion of management’s time and attention. In addition, violations of these laws are punishable by monetary fines, civil and criminal penalties, exclusion from participation in GHC Programs, and forfeiture of amounts collected in violation of such laws and regulations, any of which could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

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Federal and state laws that protect the privacy and security of personal information may increase our costs and limit our ability to collect and use that information and subject us to liability if we are unable to fully comply with such laws.

Numerous federal and state laws, rules and regulations govern the collection, dissemination, use, security and confidentiality of personal information, including individually identifiable health information. These laws include:

| • |  | Provisions of HIPAA that limit how covered entities and business associates may use and disclose PHI, provide certain rights to individuals with respect to that information and impose certain security requirements;

| • |  | HITECH, which required OCR to strengthen and expand the HIPAA Privacy Rule and Security Rule and imposes data breach notification obligations;

| • |  | Other federal and state laws restricting the use and protecting the privacy and security of personal information, including health information, many of which are not preempted by HIPAA;

| • |  | Federal and state consumer protection laws; and

| • |  | Federal and state laws regulating the conduct of research with human subjects.

As part of our business operations, including our medical record keeping, third-party billing, research and other services, we collect and maintain PHI in paper and electronic format. Standards related to health information, whether implemented pursuant to HIPAA, HITECH, state laws, federal or state action or otherwise, could have a significant effect on the manner in which we handle personal information, including PHI, and communicate with payors, providers, patients and others, and compliance with these standards could impose significant costs on us or limit our ability to offer services, thereby negatively impacting the business opportunities available to us.

If we are alleged to not comply with existing or new laws, rules and regulations related to PHI or other personal information we could be subject to litigation and to sanctions that include monetary fines, civil or administrative penalties, civil damage awards or criminal penalties.

Government authorities or other parties may assert that our business practices violate antitrust laws.

The healthcare industry is subject to close antitrust scrutiny. The FTC, the Antitrust Division of the DOJ and state Attorneys General all actively review and, in some cases, take enforcement action against business conduct and acquisitions in the healthcare industry. Private parties harmed by alleged anticompetitive conduct can also bring antitrust suits. Violations of antitrust laws may be punishable by substantial penalties, including significant monetary fines and treble damages, civil penalties, criminal sanctions, and consent decrees and injunctions prohibiting certain activities or requiring divestiture or discontinuance of business operations. Any of these penalties could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

Our affiliated physicians and other individual providers may not appropriately record or document services that they provide.

Our affiliated physicians and other individual providers are responsible for appropriately recording and documenting the services that they provide. We use this information to seek reimbursement for their services from third-party payors. In addition, we utilize third-party contractors to perform certain revenue cycle management functions for healthcare providers, including medical coding. If our affiliated physicians or other individual providers and third-party contractors do not appropriately document, or where applicable, code for their services or our customers’ services, we could be subjected to administrative, regulatory, civil, or criminal investigations or sanctions and our business, financial condition, results of operations and cash flows could be materially adversely affected.

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Failure to manage third-party service providers may adversely affect our ability to maintain the quality of service that we provide.

We outsource a certain portion of our revenue cycle management functions to third-party service providers, but we may increase the amount of revenue cycle management functions we outsource in the future. These functions are performed both domestically and in offshore locations, with our oversight. If our outsourcing partners fail to perform their obligations in a timely manner or at satisfactory quality levels or if they are unable to attract or retain sufficient personnel with the necessary skill sets to meet our outsourcing needs, the efficiency, effectiveness and quality of our services could suffer. In addition, our reliance on a workforce in other countries exposes us to disruptions in the business, political and economic environment in those regions. Further, any changes to existing laws or the enactment of new legislation restricting offshore outsourcing in the United States may adversely affect our ability to outsource functions to third-party offshore service providers. Our ability to manage any difficulties encountered could be largely outside of our control. In addition, payors may have prohibitions or restrictions on the use of third-party service providers and/or require notice for the use of such third-party service providers. Diminished service quality from outsourcing, our inability to utilize offshore service providers or the failure to comply with restrictions on the use of third-party service providers could have an adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

We may not find suitable acquisition candidates or successfully integrate our acquisitions. Our acquisitions may expose us to greater business risks and could affect our payor mix.

We have expanded and continue to seek to expand our presence in new and existing metropolitan areas by acquiring established neonatal, radiology, anesthesia, maternal-fetal, pediatric cardiology and other complementary pediatric subspecialty physician group practices. Also, both independently and in collaboration with our hospital partners, we may seek to expand into other specialties and subspecialties. In addition, we have acquired physician and other healthcare services companies that are complementary to our physician practices.

Our acquisition strategy involves numerous risks and uncertainties, including:

| • |  | We may not be able to identify suitable acquisition candidates or strategic opportunities or implement successfully or realize the expected benefits of any suitable opportunities. In addition, we compete for acquisitions with other potential acquirers, some of which may have greater financial or operational resources than we do. This competition may intensify due to the ongoing consolidation in the healthcare industry, which may increase our acquisition costs.

| • |  | We may not be able to complete acquisitions of physician practices or services companies or we may complete acquisitions on less favorable terms as a result of changes in tax laws, financial market or other economic or market conditions.

| • |  | We may not be able to successfully integrate completed acquisitions, including our recent acquisitions. Integrating completed acquisitions into our existing operations involves numerous short-term and long-term risks, including diversion of our management’s attention, failure to retain key personnel, long-term value of acquired intangible assets and acquisition expenses. In addition, we may be required to comply with laws, rules and regulations that may differ not only from those of the states in which our operations are currently conducted but from an expansion in the service offerings we provide in certain states for which the laws, rules and regulations may be different.

| • |  | We cannot be certain that any acquired business will continue to maintain its pre-acquisition revenue and growth rates or be financially successful. In addition, we cannot be certain of the extent of any unknown or contingent liabilities of any acquired business, including liabilities for failure to comply with applicable laws, or liabilities relating to medical malpractice claims. Generally we obtain indemnification agreements from the sellers of businesses acquired with respect to pre-closing acts, omissions and other similar risks. It is possible that we may seek to enforce indemnification provisions

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| in the future against sellers who may no longer have the financial wherewithal to satisfy their obligations to us. Accordingly, we may incur material liabilities for past activities of acquired businesses.

| • |  | We could incur or assume indebtedness and issue equity in connection with acquisitions. The issuance of shares of our common stock for an acquisition may result in dilution to our existing shareholders and, depending on the number of shares that we issue, the resale of such shares could affect the trading price of our common stock.

| • |  | We may acquire businesses that derive a greater portion of their revenue from GHC Programs than what we recognize on a consolidated basis or that have business models with lower operating margins than ours. These acquisitions could affect our overall payor mix or operating results in future periods.

| • |  | Acquisitions of practices and services companies could entail financial and operating risks not fully anticipated. Such acquisitions could divert management’s attention and our resources.

| • |  | An acquisition could be subject to a challenge under the antitrust laws either before or after it is consummated. Such a challenge could involve substantial legal costs and divert management’s attention and resources and could result in us having to abandon the transaction or make a divestiture.

We may not be able to successfully execute our same-unit and organic growth strategies.

In addition to our acquisition growth strategy, we seek opportunities for increasing revenue from our existing operations through same-unit and organic growth strategies. We also seek opportunities to grow organically outside of our existing operations. We may not be able to successfully execute our same-unit and organic growth strategies for reasons including the following:

| • |  | We may not be able to expand the services that our affiliated physicians provide to our hospital partners or the services provided by our services companies to their customers.

| • |  | We may not be able to attract referrals to our office-based practices or neonatology transports to our hospital-based units.

| • |  | We may not be able to execute new contractual arrangements with hospitals, including through joint ventures, where we either currently provide or do not currently provide physician services.

| • |  | We may not be able to work with our hospital partners to develop integrated services programs for which we become a multi-specialty provider of solutions within the maternal-fetal, newborn, pediatric continuum of care.

| • |  | We may not accurately project same-unit and organic growth performance, or we may experience a shift in the mix of services that certain of our customers request from us, potentially resulting in lower margins.

In addition, certain of our organic growth strategies may involve risks and uncertainties similar to those for our acquisition strategy. See “We may not find suitable acquisition candidates or successfully integrate our acquisitions. Our acquisitions may expose us to greater business risks and could affect our payor mix.”

We may not be able to maintain effective and efficient information systems or properly safeguard our information systems.

Our operations are dependent on uninterrupted performance of our information systems. Failure to maintain reliable information systems, disruptions in our existing information systems or the implementation of new systems could cause disruptions in our business operations, including errors and delays in billings and collections, difficulty satisfying requirements under hospital contracts, disputes with patients and payors, violations of patient privacy and confidentiality requirements and other regulatory requirements, increased administrative expenses and other adverse consequences.

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In addition, information security risks have generally increased in recent years because of new technologies and the increased activities of perpetrators of cyber-attacks resulting in the theft of protected health, business or financial information. Despite our layered security controls, experienced computer programmers and hackers may be able to penetrate our information systems and misappropriate or compromise sensitive patient or personnel information or proprietary or confidential information, create system disruptions or cause shutdowns. They also may be able to develop and deploy viruses, worms and other malicious software programs that disable our systems or otherwise exploit any security vulnerabilities. Outside parties may also attempt to fraudulently induce employees to take actions, including the release of confidential or sensitive information or to make fraudulent payments, through illegal electronic spamming, phishing or other tactics.

A failure in or breach of our information systems as a result of cyber-attacks or other tactics could disrupt our business, result in the release or misuse of PHI, confidential or proprietary business information or cause financial loss, damage our reputation, increase our administrative expenses, and expose us to additional risk of liability to federal or state governments or individuals. Although we believe that we have reasonable and appropriate information security procedures and other safeguards in place, which are monitored and routinely tested internally and by external parties, as cyber threats continue to evolve, we may be required to expend additional resources to continue to enhance our information security measures or to investigate and remediate any information security vulnerabilities. Our remediation efforts may not be successful and could result in interruptions, delays or cessation of service and loss of existing or potential customers and disruption of our operations, including, without limitation, our billing processes. In addition, breaches of our security measures and the unauthorized dissemination of patient healthcare and other sensitive information, proprietary or confidential information about us, our patients, clients or customers, or other third-parties, could expose such persons’ personal information to the risk of financial or medical identity theft or expose us or such persons to a risk of loss or misuse of this information, result in litigation and potential liability for us, damage our brand and reputation or otherwise harm our business. Additionally, under certain circumstances, we could be excluded temporarily or permanently from certain commercial or GHC Programs. Any of these disruptions or breaches of security could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

Our employees and business partners may not appropriately secure and protect confidential information in their possession.

Each of our employees and business partners is responsible for the security of the information in our systems or under our control and to ensure that private and financial information is kept confidential. Should an employee or business partner not follow appropriate security measures, including those related to cyber threats or attacks or other tactics, as well as our privacy and security policies and procedures, the improper release of personal information, including PHI, or confidential business or financial information, or misappropriation of assets could result. The release of such information or misappropriation of assets could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

We may not be able to successfully recruit, onboard and retain qualified physicians and other clinicians and other personnel, and our compensation expense for existing clinicians and other personnel may increase.

We are dependent upon our ability to recruit and retain a sufficient number of qualified physicians and other clinicians and other personnel to service existing units at hospitals and our affiliated practices, service our existing customers’ radiology read volumes and expand our business. We compete with many types of healthcare providers, including teaching, research and government institutions, hospitals and health systems and other practice and services groups, for the services of qualified clinicians. We may not be able to continue to recruit new clinicians or other personnel or renew contracts with existing clinicians or other personnel on acceptable terms. In addition, the recruiting and onboarding process for certain of our physicians and other clinicians can

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take several months, or longer, to complete due to various requirements, including state licensing and hospital credentialing. In addition, if the demand exceeds the supply for physicians and other clinicians and personnel either in general or in specific markets, we could experience an increase in compensation expense, including premium pay and agency labor costs. If we are unable to recruit new physicians, renew contracts on acceptable terms or onboard physicians, clinicians and other personnel in a reasonable period of time, our ability to service existing or new hospital units, staff existing or new office-based practices and service our existing or new customer radiology read volumes could be adversely affected. In addition, if we experience a higher rate of growth in compensation expense, our business, financial condition, results of operations, cash flows and the trading price of our securities could be materially, adversely affected.

A significant number of our affiliated physicians or other clinicians could leave our affiliated practices or our affiliated professional contractors may be unable to enforce the non-competition covenants of departed physicians.

Our affiliated professional contractors usually enter into employment agreements with our affiliated physicians. Certain of our employment agreements can be terminated without cause by any party upon prior written notice. In addition, substantially all of our affiliated physicians have agreed not to compete within a specified geographic area for a certain period after termination of employment. The law governing non-compete agreements and other forms of restrictive covenants varies from state to state. Although we believe that the non-competition and other restrictive covenants applicable to our affiliated physicians are reasonable in scope and duration and therefore enforceable under applicable state law, courts and arbitrators in some states may be reluctant to enforce non-compete agreements and restrictive covenants against physicians. In addition, we may incur significant legal fees to pursue enforcement of such agreements and restrictive covenants. Our affiliated physicians or other clinicians may leave our affiliated practices for a variety of reasons, including in order to provide services for other types of healthcare providers, such as teaching, research and government institutions, hospitals and health systems and other practice groups. If a substantial number of our affiliated physicians or other clinicians leave our affiliated practices, we could incur significant legal fees to pursue enforcement of certain covenants within employment agreements or if our affiliated professional contractors are unable to enforce the non-competition covenants in the employment agreements, our business, financial condition, results of operations and cash flows could be materially, adversely affected.

Our treatment of certain physicians and other clinicians as independent contractors may be challenged by taxing authorities or other governmental agencies.

Certain of our affiliated physicians and other clinicians are treated as independent contractors, as opposed to employees, and, accordingly, we do not withhold federal income, state income, FICA, or other employment related taxes from these individuals’ compensation, make federal income, state income, FICA, or unemployment tax or other related payments, provide workers’ compensation insurance or allow them to participate in the benefits and retirement programs available to our employees, or apply federal or state employee requirements. The classification of physicians and other clinicians as independent contractors depends on the facts and circumstances of the relationship. Additionally, under current federal tax law, a safe harbor from reclassification, and consequently retroactive taxes and penalties, is available if our current treatment is consistent with a long-standing practice of a significant segment of our industry and if we meet certain other requirements. In the past, there have been proposals to eliminate the safe harbor, and similar proposals may happen again in the future. If taxing authorities or other governmental agencies are successful in challenging our treatment of these physicians and other clinicians as independent contractors, and we do not prevail in demonstrating the applicability of the safe harbor to our operations or the safe harbor is eliminated, we may be required to pay retroactive employment taxes and penalties and reclassify such independent contractors to employees. In addition, such independent contractors could claim retroactive entitlements to various employee benefits. Any of these actions would increase our costs related to these physicians and our business, financial condition, results of operations and cash flows could be materially, adversely affected.

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We may be subject to medical malpractice and other lawsuits not covered by insurance.

Our business entails an inherent risk of claims of medical malpractice against our affiliated physicians and us. We may also be subject to other lawsuits which may involve large claims and significant defense costs. Although we currently maintain liability insurance coverage intended to cover professional liability and other claims, there can be no assurance that our insurance coverage will be adequate to cover liabilities arising out of claims asserted against us where the outcomes of such claims are unfavorable to us. Generally, we self-insure our liabilities to pay retention amounts for professional liability matters through a wholly owned captive insurance subsidiary. Liabilities in excess of our insurance coverage, including coverage for professional liability and other claims, could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. See Item 1. Business—“Other Legal Proceedings” and—“Professional and General Liability Coverage.”

The reserves that we have established related to our professional liability losses are subject to inherent uncertainties and if a deficiency is determined this may lead to a reduction in our net earnings.

We have established reserves for losses and related expenses that represent estimates involving actuarial projections. These actuarial projections are developed at a given point in time and represent our expectations of the ultimate resolution and administration of costs of losses incurred with respect to professional liability risks for the amount of risk retained by us. Insurance reserves are inherently subject to uncertainty. Our reserve estimates are based on actuarial valuations using historical claims, demographic factors, industry trends, severity and exposure factors and other actuarial assumptions. The estimates of projected ultimate losses are developed at least annually. Our reserves could be significantly affected should current and future occurrences differ from historical claim trends and expectations. While claims are monitored closely when estimating reserves, the complexity of the claims and wide range of potential outcomes often hamper timely adjustments to the assumptions used in these estimates. Actual losses and related expenses may deviate, perhaps substantially, from the reserve estimates reflected in our financial statements. If our estimated reserves are determined to be inadequate, we will be required to increase reserves at the time the deficiency is determined. See Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—“Application of Critical Accounting Policies and Estimates—Professional Liability Coverage.”

We may write-off intangible assets, such as goodwill.

The carrying value of our intangible assets, which consists primarily of goodwill related to our acquisitions, is subject to testing at least annually, and more frequently if impairment indicators exist. Under current accounting standards, goodwill is tested for impairment on an annual basis and we may be subject to impairment losses as circumstances change after an acquisition. If we record an impairment loss related to our goodwill, it could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

We may not effectively manage our growth.

We have experienced significant growth in our business, including growth outside of our core physician specialties. Growth in the number of our employees and affiliated physicians in recent years places significant demands on our financial, operational and management resources. Continued growth may impair our ability to provide our services efficiently and to manage our employees adequately. While we are taking steps to manage our growth, our future results of operations could be materially, adversely affected if we are unable to do so effectively.

Our quarterly results will likely fluctuate from period to period.

We have historically experienced and expect to continue to experience quarterly fluctuations in net revenue and net income. For example, we typically experience negative cash flow from operations in the first quarter of

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each year, principally as a result of bonus payments to affiliated physicians as well as discretionary matching contributions for participants in our qualified contributory savings plans. In addition, a significant number of our employees and associated professional contractors (primarily affiliated physicians) exceed the level of taxable wages for social security contributions during the first and second quarters. As a result, we incur a significantly higher payroll tax burden and our net income is lower during those quarters. Moreover, a lower number of calendar days are present in the first and second quarters of the year as compared to the remainder of the year. Because we provide services in the NICU on a 24-hours-a-day basis, 365 days a year, any reduction in service days will have a corresponding reduction in net revenue. In addition, any reduction in office days in our office-based practices or business days in our anesthesia practices will also have a corresponding reduction in net revenue. We also have significant fixed operating costs, including costs for our affiliated physicians, and as a result, are highly dependent on patient volume and capacity utilization of our affiliated physicians to sustain profitability. Quarterly results may also be impacted by the timing of acquisitions and any fluctuation in patient volume. As a result, our results of operations for any quarter are not indicative of results of operations for any future period or full fiscal year.

Our current indebtedness and any future indebtedness could adversely affect us by reducing our flexibility to respond to changing business and economic conditions and expose us to interest rate risk to the extent of any variable rate debt. In addition, a certain portion of our interest expense may not be deductible.

As of December 31, 2018, our total indebtedness was $2.0 billion, of which $739.5 million was exposed to variable interest rates. We also had $1.3 billion of additional borrowing capacity under our revolving line of credit which was subject to a variable interest rate. Other debt we incur also could be variable rate debt. In addition, the Tax Cuts and Jobs Act of 2017 places certain limitations on the deductibility of interest expense at a percentage of taxable income. If interest rates increase, our variable rate debt will create higher debt service requirements, and if interest expense increases beyond a specified percentage of taxable income, a portion of that interest expense may not be deductible for income tax purposes, which could adversely affect our results of operations and cash flows.

We have limited restrictions on incurring substantial additional indebtedness in the future. Our current indebtedness and any future increases in leverage could have adverse consequences on us, including:

| • |  | a substantial portion of our cash flow from operations will be required to service interest and principal payments on our debt and will not be available for operations, working capital, capital expenditures, expansion, acquisitions, dividends or general corporate or other purposes;

| • |  | our ability to obtain additional financing in the future may be impaired;

| • |  | we may be more highly leveraged than our competitors, which may place us at a competitive disadvantage;

| • |  | our flexibility in planning for, or reacting to, changes in our business and industry may be limited; and

| • |  | we may be more vulnerable in the event of a downturn in our business, our industry or the economy in general.

Our ability to make payments on and to refinance our debt will depend on our ability to generate cash in the future. This, to a certain extent, is subject to general economic, business, financial, competitive, legislative, regulatory, and other factors that are beyond our control. We cannot assure you that our business will generate sufficient cash flow from operations or that future borrowings will be available under our revolving line of credit in an amount sufficient to enable us to pay our debt or to fund our other liquidity needs. We may need to refinance all or a portion of our debt on or before maturity. We cannot assure you that we will be able to refinance any of our debt, including our revolving line of credit and senior notes, on commercially reasonable terms or at all.

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Servicing our debt requires a significant amount of cash.

Our ability to make scheduled payments on or to refinance our debt obligations depends on our financial condition and operating performance, which is subject to prevailing economic and competitive conditions and to certain financial, business, and other factors. We may not be able to maintain a level of cash flows from operating activities sufficient to permit us to pay the principal and interest on our indebtedness.

If our cash flows and capital resources are insufficient to fund our debt service requirements, we may be forced to reduce or delay acquisitions or other investments, or to seek additional capital, or restructure or refinance our indebtedness. Our ability to restructure or refinance our debt will depend on the condition of the capital markets and our financial condition at such time. In addition, any failure to make payments of interest and principal on our outstanding indebtedness on a timely basis would likely result in other defaults, disrupt our operations and cause a reduction of our credit rating, which could further harm our ability to finance or refinance our obligations and business operations. These alternative measures may not be successful and may not permit us to meet our scheduled debt service obligations.

The value of our common stock may fluctuate.

There has been significant volatility in the market price of securities of healthcare companies generally that we believe in many cases has been unrelated to operating performance. In addition, we believe that certain factors, such as actual and potential legislative and regulatory developments, including announced regulatory investigations, quarterly fluctuations in our actual or anticipated results of operations, lower revenue or earnings than those anticipated by securities analysts, not meeting publicly announced expectations, and general economic and financial market conditions, could cause the price of our common stock to fluctuate substantially.

We may not be able to collect reimbursements for our services from third-party payors.

A significant portion of our net revenue is derived from reimbursements from various third-party payors, including GHC Programs, private insurance plans and managed care plans, for services provided by our affiliated professional contractors. We are responsible for submitting reimbursement requests to these payors and collecting the reimbursements, and we assume the financial risks relating to uncollectible and delayed reimbursements. In the current healthcare environment, payors continue their efforts to control expenditures for healthcare, including revisions to coverage and reimbursement policies. Due to the nature of our business and our participation in government-funded and private reimbursement programs, we are involved from time to time in inquiries, reviews, audits and investigations by governmental agencies and private payors of our business practices, including assessments of our compliance with coding, billing and documentation requirements. We may be required to repay these agencies or private payors if a finding is made that we were incorrectly reimbursed, or we may become involved in disputes with payors and could be subjected to pre-payment and post-payment reviews, which can be time-consuming and result in non-payment or delayed payment for the services we provide. We may also experience difficulties in collecting reimbursements because third-party payors may seek to reduce or delay reimbursements to which we are entitled for services that our affiliated physicians have provided or they experience administrative issues that result in a delay in reimbursements. In addition, GHC Programs may deny our application to become a participating provider that could cause us to not be able to provide services to patients or prohibit us from billing for such services. If we are not reimbursed fully and in a timely manner for such services or there is a finding that we were incorrectly reimbursed, our revenue, cash flows and financial condition could be materially, adversely affected. In addition, we may choose to challenge certain GHC reimbursement decisions through administrative appeal mechanisms. Currently, many of those appeal pathways are backlogged and slow to provide resolution, further affecting our ability to collect reimbursement for services rendered.

In addition, adverse economic conditions could affect the timeliness and amounts received from our third-party and government payors which would impact our short-term liquidity needs.

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Hospitals or other customers may terminate their agreements with us, our physicians may lose the ability to provide services in hospitals or administrative fees paid to us by hospitals may be reduced.

Our net revenue is derived primarily from fee-for-service billings for patient care and other services provided by our affiliated physicians and from administrative fees paid to us by hospitals. See Item 1. Business—“Relationships with Our Partners—Hospitals.” Our hospital partners or other customers may cancel or not renew their contracts with us, may reduce or eliminate our administrative fees in the future, or refuse to pay us our administrative fees if we fail to honor the terms of our agreement or fail to meet certain performance metrics under those agreements. Further, consolidation of hospitals, health care systems or other customers could adversely affect our ability to negotiate with these entities. Adverse economic conditions, including decreased federal and state funding to hospitals, could influence future actions of our hospital partners or other customers. To the extent that our arrangements with our hospital partners or other customers are canceled, or are not renewed or replaced with other arrangements having at least as favorable terms, our business, financial condition and results of operations could be adversely affected. In addition, to the extent our affiliated physicians lose their privileges in hospitals or hospitals enter into arrangements with or employ other physicians, including our existing affiliated physicians, our business, financial condition, results of operations and cash flows could be materially, adversely affected.

Hospitals could limit our ability to use our management information systems in our units by requiring us to use their own management information systems.

Our management information systems, including BabySteps® and the MEDNAX Qualified Clinical Data Registry are used to support our day-to-day operations and ongoing clinical research and business analysis. If a hospital prohibits us from using our own management information systems, it may interrupt the efficient operation of our information systems which, in turn, may limit our ability to operate important aspects of our business, including billing and reimbursement as well as research and education initiatives. This inability to use our management information systems at hospital locations may have a material adverse effect on our business, financial condition, results of operations and cash flows.

Our industry is highly competitive.

The healthcare industry is highly competitive and subject to continual changes in the methods by which services are provided and the manner in which healthcare providers are selected and compensated. Because our operations consist primarily of physician services provided within hospital-based units, we compete with other healthcare services companies and physician groups for contracts with hospitals to provide our services to patients. We also face competition from hospitals themselves to provide our services. In addition, we face competition from other services companies in our teleradiology business and management services organization.

Further, consolidation within the healthcare industry could strengthen certain competitors that provide services to hospitals and other customers. Companies in other healthcare industry segments, some of which have greater financial and other resources than ours, may become competitors in providing neonatal, anesthesia, maternal-fetal, radiology or other pediatric subspecialty care. Additionally, we face competition from healthcare-focused and other private equity firms. We may not be able to continue to compete effectively in this industry, additional competitors may enter metropolitan areas where we operate, and this increased competition may have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

Unfavorable changes or conditions could occur in the states where our operations are concentrated.

A majority of our net revenue in 2018 was generated by our operations in five states. In particular, Texas accounted for approximately 20% of our net revenue in 2018. See Item 1. Business—“Geographic Coverage.” Adverse changes or conditions affecting these particular states, such as healthcare reforms, changes in laws and

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regulations, reduced Medicaid eligibility or reimbursements and government investigations, economic conditions, weather conditions, and natural disasters may have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

We are dependent upon our key management personnel for our future success.

Our success depends to a significant extent on the continued contributions of our key management personnel, including our Chief Executive Officer, Roger J. Medel, M.D., for the management of our business and implementation of our business strategy. The loss of Dr. Medel or other key management personnel could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

We are subject to litigation risks.

From time to time, we are involved in various litigation matters and claims, including regulatory proceedings, administrative proceedings, governmental investigations, and contract disputes, as they relate to our services and business. We may face potential claims or liability for, among other things, breach of contract, defamation, libel, fraud or negligence. Our contracts with hospitals generally require us to indemnify them and their affiliates for losses resulting from the negligence of our affiliated physicians and other clinicians. We may also face employment-related litigation, including claims of age discrimination, sexual harassment, gender discrimination, immigration violations, or other local, state, and federal labor law violations. Because of the uncertain nature of litigation and insurance coverage decisions, the outcome of such actions and proceedings cannot be predicted with certainty and an unfavorable resolution of one or more of them could have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities. In addition, legal fees and costs associated with prosecuting and defending litigation matters could have a material adverse effect on our business, financial condition, results of operation and the trading price of our securities.

If our shareholders do not approve the issuance of additional shares of common stock under our Amended and Restated 2008 Incentive Compensation Plan, as amended (the “Incentive Plan”), or a new incentive plan, we may not have sufficient shares of common stock under the Incentive Plan to implement our compensation plans, our ability to attract and retain talent may be hindered, and our cash flows may be reduced.

We have historically used restricted stock, stock options and other equity awards as a component of our employee and director compensation programs to align our directors’, officers’ and employees’ interests with the interests of our shareholders, encourage employee retention and provide competitive compensation packages. As of February 13, 2019, there were approximately 50,600 shares of common stock available for issuance under the Incentive Plan. We intend to seek shareholder approval at our upcoming annual meeting of shareholders for the issuance of additional shares of common stock under the Incentive Plan or a new incentive plan. If we do not obtain shareholder approval to increase the number of shares of common stock available for issuance under the Incentive Plan or a new incentive plan, we may be required to use a greater percentage of our cash flow for incentive, retention, and hiring payments, which would reduce the cash flow available for other purposes and could have a material adverse effect on our ability to attract and retain talent necessary to run our business.

Provisions of our articles and bylaws could deter takeover attempts, but our business could be negatively affected as a result of shareholder activism.

Our Amended and Restated Articles of Incorporation, as amended, authorize our Board of Directors to issue up to 1,000,000 shares of undesignated preferred stock and to determine the powers, preferences and rights of these shares without shareholder approval. This preferred stock could be issued with voting, liquidation, dividend and other rights superior to those of the holders of common stock. The issuance of preferred stock under some circumstances could have the effect of delaying, deferring or preventing a change in control. In addition,

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provisions in our Amended and Restated Articles of Incorporation, as amended, and Bylaws, including those relating to calling shareholder meetings, taking action by written consent and other matters, could render it more difficult or discourage an attempt to obtain control of MEDNAX through a proxy contest or consent solicitation, however, there is no assurance that these provisions would have such an effect. These provisions could limit the price that some investors might be willing to pay in the future for our shares of common stock. Notwithstanding these provisions, we could become the target of activist shareholders who acquire ownership positions in our common stock and seek to influence our company. Responding to actions by activist shareholders can be costly and time-consuming, disrupt our business and divert the attention of our Board of Directors, management and employees. Additionally, perceived uncertainties as to our future direction as a result of shareholder activism may lead to the perception of a change in the direction of our business or other instability, which may be exploited by our competitors, cause concern to our current or potential customers and acquisition candidates, and make it more difficult for us to attract and retain qualified personnel, which could have a material adverse effect on our business, financial condition, results of operations, and cash flows and the trading prices of our securities. In addition, the trading prices of our securities may experience periods of increased volatility as a result of shareholder activism.

ITEM 1B. | UNRESOLVED STAFF COMMENTS

None.

ITEM 2. | PROPERTIES

Our two corporate office buildings, which we own, are located in Sunrise, Florida and contain 260,000 square feet of office space. We also own an office building used for our management services organization call center operations covering 175,000 square feet in Cascade Falls, Michigan. We also lease space in hospitals and other facilities for our business and medical offices, and other needs. See Note 16 to the Consolidated Financial Statements in this Form 10-K, which is incorporated herein by reference. We believe that our facilities and the equipment used in our business are in good condition, in all material respects, and sufficient for our present needs.

ITEM 3. | LEGAL PROCEEDINGS

The information required by this Item is included in and incorporated herein by reference to Item 1. Business of this Form 10-K under “Government Investigations” and “Other Legal Proceedings.”

ITEM 4. | MINE SAFETY DISCLOSURES

Not applicable

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PART II

ITEM 5. | MARKET FOR REGISTRANT’S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Common Stock

Our common stock is traded on the New York Stock Exchange (the “NYSE”) under the symbol “MD.”

As of February 7, 2019, we had 326 holders of record of our common stock, and the closing sales price on that date for our common stock was $36.32 per share. We believe that the number of beneficial owners of our common stock is greater than the number of record holders because a significant number of shares of our common stock is held through brokerage firms in “street name.”

Dividend Policy

We did not declare or pay any cash dividends on our common stock in 2018, 2017, or 2016, nor do we currently intend to declare or pay any cash dividends in the future. The payment of any future dividends will be at the discretion of our Board of Directors and will depend upon, among other things, future earnings, results of operations, capital requirements, our general financial condition, general business conditions and contractual restrictions on payment of dividends, if any, as well as such other factors as our Board of Directors may deem relevant. Our credit agreement (the “Credit Agreement”) imposes certain limitations on our ability to declare and pay cash dividends. See Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations—“Liquidity and Capital Resources.”

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Performance Graph

The following graph compares the cumulative total shareholder return on $100 invested on December 31, 2013 in our common stock against the cumulative total return of the S&P 500 Index, S&P 600 Health Care Index, and the NYSE Composite Index. The returns are calculated assuming reinvestment of dividends. The graph covers the period from December 31, 2013 through December 31, 2018. The stock price performance included in the graph is not necessarily indicative of future stock price performance.

The performance graph shall not be deemed incorporated by reference by any general statement incorporating by reference this annual report into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934, except to the extent that we specifically incorporate this information by reference, and shall not otherwise be deemed filed under such acts.

|  | Base Period |  |  | Years Ending |
Company/Index |  | 2013 |  |  | 2014 |  |  | 2015 |  |  | 2016 |  |  | 2017 |  |  | 2018 |
MEDNAX, Inc. |  | $ | 100.00 |  |  | $ | 123.85 |  |  | $ | 134.25 |  |  | $ | 124.88 |  |  | $ | 100.11 |  |  | $ | 61.82 |
S&P 500 Index |  | $ | 100.00 |  |  | $ | 111.39 |  |  | $ | 110.58 |  |  | $ | 121.13 |  |  | $ | 144.65 |  |  | $ | 135.63 |
S&P 600 Health Care |  | $ | 100.00 |  |  | $ | 110.92 |  |  | $ | 133.53 |  |  | $ | 136.13 |  |  | $ | 183.06 |  |  | $ | 200.95 |
NYSE Composite Index |  | $ | 100.00 |  |  | $ | 104.22 |  |  | $ | 97.53 |  |  | $ | 106.31 |  |  | $ | 123.16 |  |  | $ | 109.37 |

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Issuer Purchases of Equity Securities

During the three months ended December 31, 2018, 1,662,616 shares of our common stock were delivered to us in connection with the final settlement of our August 2018 accelerated share repurchase program.

Period |  | Total Number of Shares Repurchased |  |  | Average Price Paid per Share |  |  | Total Number of Shares Purchased as part of the Repurchase Program |  |  | Approximate Dollar Value of Shares that May Yet Be Purchased Under the Repurchase Programs (a) |
October 1 – October 31, 2018 |  |  | — |  |  | $ | — |  |  |  | — |  |  |  | (a | )
November 1 – November 30, 2018 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (a | )
December 1 – December 31, 2018 |  |  | 1,662,616 |  |  | $ | 42.47 | (b) |  |  | 5,886,480 |  |  |  | (a | )
Total |  |  | 1,662,616 |  |  | $ | 42.47 |  |  |  | 5,886,480 |  |  |  | (a | )

(a) | We have two active repurchase programs. Our July 2013 repurchase program allows us to repurchase shares of our common stock up to an amount sufficient to offset the dilutive impact from the issuance of shares under our equity compensation programs, which was estimated to be approximately 1.1 million shares for 2018 and is estimated to be approximately 1.3 million shares for 2019. The share repurchases under that program for 2018 were completed during the second quarter of 2018. Our August 2018 repurchase program allows us to repurchase up to an additional $500.0 million of shares of our common stock, of which we have repurchased $250.0 million, inclusive of the shares delivered to us in the table above representing the final settlement of our accelerated share repurchase program entered into on August 31, 2018.

(b) | Represents the average price paid per share for the $250.0 million accelerated share repurchase program entered into on August 31, 2018.

The amount and timing of any future repurchases will depend upon several factors, including general economic and market conditions and trading restrictions.

Recent Sales of Unregistered Equity Securities

During the three months ended December 31, 2018, we did not sell any unregistered shares of our equity securities.

Equity Compensation Plans

Information regarding equity compensation plans is set forth in Item 12 of this Form 10-K and is incorporated herein by reference.

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ITEM 6. | SELECTED FINANCIAL DATA

The following table includes selected consolidated financial data set forth as of and for each of the five years in the period ended December 31, 2018. The balance sheet data at December 31, 2018 and 2017, and the income statement data for the years ended December 31, 2018, 2017 and 2016, have been derived from the Consolidated Financial Statements included in this Form 10-K. This selected financial data should be read in conjunction with “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” and our Consolidated Financial Statements and the related notes included in Items 7 and 8, respectively, of this Form 10-K (in thousands, except per share and other operating data).

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |  |  | 2015 |  |  | 2014 |
Consolidated Income Statement Data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenue (1) |  | $ | 3,647,123 |  |  | $ | 3,458,312 |  |  | $ | 3,183,159 |  |  | $ | 2,779,996 |  |  | $ | 2,438,913 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits |  |  | 2,535,588 |  |  |  | 2,337,734 |  |  |  | 2,031,220 |  |  |  | 1,753,505 |  |  |  | 1,543,395 |
Practice supplies and other operating expenses |  |  | 122,028 |  |  |  | 120,518 |  |  |  | 118,416 |  |  |  | 98,480 |  |  |  | 89,002 |
General and administrative expenses |  |  | 432,378 |  |  |  | 417,105 |  |  |  | 372,572 |  |  |  | 305,915 |  |  |  | 247,527 |
Depreciation and amortization |  |  | 111,281 |  |  |  | 102,879 |  |  |  | 89,264 |  |  |  | 64,228 |  |  |  | 45,990 |
Total operating expenses |  |  | 3,201,275 |  |  |  | 2,978,236 |  |  |  | 2,611,472 |  |  |  | 2,222,128 |  |  |  | 1,925,914 |
Income from operations |  |  | 445,848 |  |  |  | 480,076 |  |  |  | 571,687 |  |  |  | 557,868 |  |  |  | 512,999 |
Investment and other income |  |  | 4,935 |  |  |  | 3,953 |  |  |  | 2,019 |  |  |  | 1,844 |  |  |  | 2,728 |
Interest expense |  |  | (88,769 | ) |  |  | (74,559 | ) |  |  | (63,092 | ) |  |  | (23,110 | ) |  |  | (8,891 | )
Equity in earnings of unconsolidated affiliates |  |  | 6,825 |  |  |  | 952 |  |  |  | 3,185 |  |  |  | 3,127 |  |  |  | 1,780 |
Total non-operating expenses |  |  | (77,009 | ) |  |  | (69,654 | ) |  |  | (57,888 | ) |  |  | (18,139 | ) |  |  | (4,383 | )
Income before income taxes |  |  | 368,839 |  |  |  | 410,422 |  |  |  | 513,799 |  |  |  | 539,729 |  |  |  | 508,616 |
Income tax provision |  |  | (100,210 | ) |  |  | (90,050 | ) |  |  | (189,203 | ) |  |  | (204,038 | ) |  |  | (191,413 | )
Net income |  |  | 268,629 |  |  |  | 320,372 |  |  |  | 324,596 |  |  |  | 335,691 |  |  |  | 317,203 |
Net loss attributable to noncontrolling interests |  |  | — |  |  |  | — |  |  |  | 318 |  |  |  | 629 |  |  |  | 78 |
Net income attributable to MEDNAX, Inc. |  | $ | 268,629 |  |  | $ | 320,372 |  |  | $ | 324,914 |  |  | $ | 336,320 |  |  | $ | 317,281 |
Per Common and Common Equivalent Share Data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to MEDNAX, Inc.: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.95 |  |  | $ | 3.47 |  |  | $ | 3.52 |  |  | $ | 3.61 |  |  | $ | 3.22 |
Diluted |  | $ | 2.93 |  |  | $ | 3.45 |  |  | $ | 3.49 |  |  | $ | 3.58 |  |  | $ | 3.18 |
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 91,104 |  |  |  | 92,431 |  |  |  | 92,422 |  |  |  | 93,077 |  |  |  | 98,588 |
Diluted |  |  | 91,606 |  |  |  | 92,958 |  |  |  | 93,109 |  |  |  | 93,960 |  |  |  | 99,887 |
Other Operating Data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of physicians at end of year |  |  | 4,214 |  |  |  | 4,083 |  |  |  | 3,617 |  |  |  | 3,240 |  |  |  | 2,625 |
Number of births |  |  | 793,918 |  |  |  | 808,465 |  |  |  | 807,285 |  |  |  | 803,311 |  |  |  | 799,868 |
NICU admissions |  |  | 113,485 |  |  |  | 112,965 |  |  |  | 112,184 |  |  |  | 111,407 |  |  |  | 108,978 |
NICU patient days |  |  | 1,977,516 |  |  |  | 1,990,521 |  |  |  | 1,977,204 |  |  |  | 1,960,768 |  |  |  | 1,919,579 |
Number of anesthesia cases |  |  | 1,844,451 |  |  |  | 1,924,952 |  |  |  | 1,827,194 |  |  |  | 1,533,089 |  |  |  | 1,284,149 |
Number of radiology studies (2) |  |  | 11,505,524 |  |  |  | 10,166,227 |  |  |  | 5,755,853 |  |  |  | 5,317,309 |  |  |  | — |
Consolidated Balance Sheet Data: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 36,745 |  |  | $ | 60,200 |  |  | $ | 55,698 |  |  | $ | 51,572 |  |  | $ | 47,928 |
Working capital |  |  | 157,216 |  |  |  | 95,810 |  |  |  | 138,179 |  |  |  | 98,998 |  |  |  | 50,779 |
Total assets |  |  | 5,934,911 |  |  |  | 5,867,278 |  |  |  | 5,339,400 |  |  |  | 4,547,214 |  |  |  | 3,608,248 |
Total liabilities |  |  | 2,847,027 |  |  |  | 2,800,824 |  |  |  | 2,578,633 |  |  |  | 2,109,368 |  |  |  | 1,342,682 |
Borrowings under credit facility |  |  | 739,500 |  |  |  | 1,110,500 |  |  |  | 963,500 |  |  |  | 533,500 |  |  |  | 568,000 |
Senior notes outstanding |  |  | 1,250,000 |  |  |  | 750,000 |  |  |  | 750,000 |  |  |  | 750,000 |  |  |  | — |
Total equity |  |  | 3,087,884 |  |  |  | 3,066,454 |  |  |  | 2,760,767 |  |  |  | 2,437,846 |  |  |  | 2,265,566 |

(1) | The increase in net revenue related to acquisitions was $102.1 million, $256.0 million, $356.4 million, $345.7 million, and $205.4 million for the years ended December 31, 2018, 2017, 2016, 2015, and 2014, respectively.

(2) | Represents estimated annualized number of studies for years in which acquisitions took place.

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ITEM 7. | MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion highlights the principal factors that have affected our financial condition and results of operations as well as our liquidity and capital resources for the periods described. This discussion should be read in conjunction with our Consolidated Financial Statements and the related notes included in Item 8 of this Form 10-K. This discussion contains forward-looking statements. Please see the explanatory note concerning “Forward-Looking Statements” preceding Part I of this Form 10-K and Item 1A. Risk Factors for a discussion of the uncertainties, risks and assumptions associated with these forward-looking statements. The operating results for the periods presented were not significantly affected by inflation.

OVERVIEW

MEDNAX is a leading provider of physician services including newborn, anesthesia, radiology and teleradiology, maternal-fetal, pediatric cardiology and other pediatric subspecialty care in 39 states and Puerto Rico. At December 31, 2018, our national network comprised over 4,210 affiliated physicians, including 1,270 physicians who provide neonatal clinical care, primarily within hospital-based NICUs, to babies born prematurely or with medical complications. We have 1,315 affiliated physicians who provide anesthesia care to patients in connection with surgical and other procedures, as well as pain management. In addition, we have 365 affiliated physicians who provide maternal-fetal and obstetrical medical care to expectant mothers experiencing complicated pregnancies primarily in areas where our affiliated neonatal physicians practice. Our network also includes other pediatric subspecialists, including 190 physicians providing pediatric intensive care, 110 physicians providing pediatric cardiology care, 140 physicians providing hospital-based pediatric care, 25 physicians providing pediatric surgical care, and 10 physicians providing pediatric ear, nose and throat and pediatric ophthalmology services. MEDNAX also provides radiology services including diagnostic imaging and interventional radiology, through a network of more than 355 affiliated physicians, as well as teleradiology services in all 50 states, the District of Columbia and Puerto Rico through a network of over 430 affiliated radiologists. In addition to our national physician network, we provide services nationwide to healthcare facilities and physicians, including ours, through complementary businesses, consisting of a management services organization focusing on full-service revenue cycle management and a consulting services company.

2018 Acquisition Activity

During 2018, we completed nine physician group practice acquisitions, including five radiology practices, two neonatology practices and two pediatric subspecialty practices.

Based on our experience, we expect that we can improve the results of all of our acquired physician practices through improved managed care contracting, improved collections, identification of growth initiatives, as well as, operating and cost savings based upon the significant infrastructure that we have developed. We believe that we bring a unique value proposition to radiology physician groups, in that we can provide practice management support and a technology platform enabling radiology to be practiced at a national level, as well as teleradiology capabilities that can enhance their efficiency, provide subspecialty access and help them to grow strategically and remain competitive while meeting the demands of their hospital partners, third-party payors and regulatory bodies. In addition, we believe that radiology physician group practice physicians can complement the staffing needs for our teleradiology services business during certain times, such as nights and weekends, when the group practice physicians are not providing services at their practices.

Shared Services and Operational Initiatives

We have developed a number of strategic initiatives across our organization, in both our shared services functions and our operational infrastructure, with a goal of generating improvements in our general and administrative expenses and our operational infrastructure. In our shared services departments, we are focused on

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improving processes, using our resources more efficiently and utilizing our scale more effectively to improve cost and service performance across our operations. Within our operational infrastructure, we have developed specific operational plans within each of our service lines and affiliated physician practices, with specific milestones and regular reporting, with the goal of generating long-term operational improvements and fostering even greater collaboration across our national medical group. We currently intend to make a series of information-technology and other investments to improve processes and performance across our enterprise, using both internal and external resources. We are targeting annualized financial improvements related to these initiatives of $40 million within general and administrative expenses and $80 million in operational improvements by the end of 2019, although there is no assurance that these improvements will be obtained. We believe these strategic initiatives, together with our continued plans to invest in focused, targeted and strategic organic and acquisitive growth, position us well to deliver a differentiated value proposition to our stakeholders while continuing to provide the highest quality care for our patients.

Senior Notes

In November 2018, we completed a private offering of $500.0 million aggregate principal amount of 6.25% senior unsecured notes due 2027 (the “2027 Notes”). Our obligations under the 2027 Notes are guaranteed on an unsecured senior basis by the same subsidiaries and affiliated professional contractors that guarantee our Credit Agreement. Interest on the 2027 Notes accrues at the rate of 6.25% per annum and is payable semi-annually in arrears on January 15 and July 15, beginning on January 15, 2019. We used the net proceeds of approximately $492.5 million from the issuance of the 2027 Notes to repay a portion of the indebtedness outstanding under our Credit Agreement.

Common Stock Repurchase Programs

In July 2013, our Board of Directors authorized the repurchase of shares of our common stock up to an amount sufficient to offset the dilutive impact from the issuance of shares under our equity compensation programs. The share repurchase program allows us to make open market purchases from time-to-time based on general economic and market conditions and trading restrictions. The repurchase program also allows for the repurchase of shares of our common stock to offset the dilutive impact from the issuance of shares, if any, related to our acquisition program. Shares repurchased by us during the second quarter of 2018 completed the repurchases under the program with respect to issuances of shares under our equity compensation programs during 2018. In August 2018, we announced that our Board of Directors had authorized the repurchase of up to $500.0 million of shares of our common stock in addition to our existing share repurchase program. As part of this repurchase program, on August 31, 2018, we entered into a $250 million uncollared accelerated share repurchase agreement with an investment bank that was completed in December 2018.

Under the share repurchase programs described above, we repurchased approximately 7.0 million shares of our common stock for approximately $302.2 million during the year ended December 31, 2018, inclusive of 54,909 shares withheld to satisfy minimum statutory withholding obligations of $2.5 million in connection with the vesting of restricted stock and exercises of stock options during the second quarter of 2018.

We may utilize various methods to effect any future share repurchases, including, among others, open market purchases and accelerated share repurchase programs. We currently intend to utilize a portion of our remaining $250 million share repurchase authorization via open market purchases in the first quarter of 2019, however, the amount and timing of repurchases will depend upon several factors, including general economic and market conditions and trading restrictions.

General Economic Conditions and Other Factors

Our operations and performance depend significantly on economic conditions. During the year ended December 31, 2018, the percentage of our patient service revenue being reimbursed under GHC Programs,

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remained relatively consistent as compared to the year ended December 31, 2017. If, however, economic conditions in the United States deteriorate, we could experience shifts toward GHC Programs, and patient volumes could decline. Further, we could experience and have experienced shifts toward GHC Programs if changes occur in population demographics within geographic locations in which we provide services. We have also experienced, and expect to continue to experience, a shift toward GHC Programs in anesthesia care. Payments received from GHC Programs are substantially less for equivalent services than payments received from commercial insurance payors. In addition, due to the rising costs of managed care premiums and patient responsibility amounts, we may experience lower net revenue resulting from increased bad debt due to patients’ inability to pay for certain services. See Item 1A. Risk Factors, in this Form 10-K for additional discussion on the general economic conditions in the United States and recent developments in the healthcare industry that could affect our business.

Healthcare Reform

The Patient Protection and Affordable Care Act (the “ACA”) contains a number of provisions that have affected us and, absent amendment or repeal, may continue to affect us over the next several years. These provisions include the establishment of health insurance exchanges to facilitate the purchase of qualified health plans, expanded Medicaid eligibility, subsidized insurance premiums and additional requirements and incentives for businesses to provide healthcare benefits. Other provisions have expanded the scope and reach of the Federal Civil False Claims Act (“FCA”) and other healthcare fraud and abuse laws. Moreover, we could be affected by potential changes to various aspects of the ACA, including subsidies, healthcare insurance marketplaces and Medicaid expansion.

The ACA remains subject to continuing legislative and administrative flux and uncertainty. In 2017, Congress unsuccessfully sought to replace substantial parts of the ACA with different mechanisms for facilitating insurance coverage in the commercial and Medicaid markets. Additionally, CMS has administratively revised a number of provisions and may seek to advance additional significant changes through regulation, guidance and enforcement in the future. At the end of 2017, Congress repealed part of the ACA that required most individuals to purchase and maintain health insurance or face a tax penalty. The 2018 mid-term elections in November 2018 changed the balance of power in Congress and may change the direction of future health-related legislation. More recently, a federal judge in Texas declared that key portions of the ACA were inconsistent with the United States Constitution and specifically that the ACA cannot stand on its own since Congress repealed the individual mandate. Several states are now engaged in appealing this decision.

If the ACA is repealed or further substantially modified, or if implementation of certain aspects of the ACA are diluted or delayed, such repeal, modification or delay may impact our business, financial condition, results of operations, cash flows and the trading price of our securities. We are unable to predict the impact of any repeal, modification or delay in the implementation of the ACA, including the repeal of the individual mandate, on us at this time.

In addition to the potential impacts to the ACA under the current Administration and Congress, there could be more sweeping changes to GHC Programs, such as a change in the structure of Medicaid by converting it into a block grant or instituting “per capita caps,” which could eliminate the guarantee that everyone who is eligible and applies for benefits would receive them and could potentially give states sweeping new authority to restrict eligibility, cut benefits and make it more difficult for people to enroll. Additionally, several states are considering and pursuing changes to their Medicaid programs, such as requiring recipients to engage in employment activities as a condition of eligibility for most adults, disenrolling recipients for failure to pay a premium, or adjusting premium amounts based on income.

As a result, we cannot predict with any assurance the ultimate effect of these laws and resulting changes to payments under GHC Programs, nor can we provide any assurance that they will not have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our

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securities. Further, any fiscal tightening impacting GHC Programs or changes to the structure of any GHC Programs could have a material adverse effect on our financial condition, results of operations, cash flows and the trading price of our securities.

The Medicare Access and CHIP Reauthorization Act

Medicare pays for most physician services based upon a national service-specific fee schedule. The Medicare Access and CHIP Reauthorization Act (“MACRA”) provides physicians 0.5% annual increases in reimbursement through 2019 as Medicare transitions to a payment system designed to reward physicians for the quality of care provided, rather than the quantity of procedures performed. MACRA requires physicians to choose to participate in one of two payment formulas, Merit-Based Incentive Payment System (“MIPS”) or Alternative Payment Models (“APMs”). Beginning in 2019, MIPS will allow eligible physicians to receive incentive payments based on the achievement of certain quality and cost metrics, among other measures, and be reduced for those who are underperforming against those same metrics and measures. As an alternative, physicians can choose to participate in an Advanced APMs, and physicians who are meaningful participants in APMs will receive bonus payments from Medicare pursuant to the law. MACRA also remains subject to review and potential modification by Congress, as well as shifting regulatory requirements established by CMS. We currently anticipate that our affiliated physicians will be eligible to receive bonus payments in 2019 through participation in the MIPS, although the amounts of such bonus payments are not expected to be material. We will continue to operationalize the provisions of MACRA and assess any further changes to the law or additional regulations enacted pursuant to the law.

We cannot predict the ultimate effect that these changes will have on us, nor can we provide any assurance that its provisions will not have a material adverse effect on our business, financial condition, results of operations, cash flows and the trading price of our securities.

Medicaid Expansion

The ACA also allows states to expand their Medicaid programs through federal payments that fund most of the cost of increasing the Medicaid eligibility income limit from a state’s historic eligibility levels to 133% of the federal poverty level. To date, 36 states and the District of Columbia have expanded Medicaid eligibility to cover this additional low income patient population, and other states are considering expansion. All of the states in which we operate, however, already cover children in the first year of life and pregnant women if their household income is at or below 133% of the federal poverty level.

Medicare Sequestration

The Budget Control Act of 2011, as amended by the American Taxpayer Relief Act of 2012, required across-the-board cuts (“sequestrations”) to Medicare reimbursement rates. These annual reductions of 2%, on average, began in April 2013 and apply to mandatory and discretionary spending in the years 2013 to 2027. Unless Congress takes action in the future to modify these sequestrations, Medicare reimbursements will be reduced by 2%, on average, annually. However, this reduction in Medicare reimbursement rates is not expected to have a material adverse effect on our business, financial condition, results of operations, cash flows or the trading price of our securities.

Geographic Coverage

During 2018, 2017 and 2016, approximately 52%, 51%, and 51%, respectively, of our net revenue was generated by operations in our five largest states. During 2018, 2017, and 2016, our five largest states consisted of Texas, Florida, Tennessee, Georgia, and North Carolina. During 2018, 2017, and 2016, our operations in Texas accounted for approximately 20%, 19%, and 19%, respectively, of our net revenue.

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Payor Mix

We bill payors for professional services provided by our affiliated physicians to our patients based upon rates for specific services provided. Our billed charges are substantially the same for all parties in a particular geographic area regardless of the party responsible for paying the bill for our services. We determine our net revenue based upon the difference between our gross fees for services and our estimated ultimate collections from payors. Net revenue differs from gross fees due to (i) managed care payments at contracted rates, (ii) GHC Program reimbursements at government-established rates, (iii) various reimbursement plans and negotiated reimbursements from other third-parties, and (iv) discounted and uncollectible accounts of private-pay patients.

Our payor mix is composed of contracted managed care, government, principally Medicare and Medicaid, other third-parties and private-pay patients. We benefit from the fact that most of the medical services provided in the NICU are classified as emergency services, a category typically classified as a covered service by managed care payors.

The following is a summary of our payor mix, expressed as a percentage of net revenue, exclusive of administrative fees and revenue related to our non-practice service offerings, for the periods indicated:

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Contracted managed care |  |  | 70 | % |  |  | 70 | % |  |  | 70 | %
Government |  |  | 24 | % |  |  | 25 | % |  |  | 23 | %
Other third-parties |  |  | 4 | % |  |  | 4 | % |  |  | 6 | %
Private-pay patients |  |  | 2 | % |  |  | 1 | % |  |  | 1 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %

The payor mix shown in the table above is not necessarily representative of the amount of services provided to patients covered under these plans. For example, the gross amount billed to patients covered under GHC Programs for the years ended December 31, 2018, 2017 and 2016 represented approximately 55% of our total gross patient service revenue. These percentages of gross revenue and the percentages of net revenue provided in the table above include the payor mix impact of acquisitions completed through December 31, 2018.

Quarterly Results

We have historically experienced and expect to continue to experience quarterly fluctuations in net revenue and net income. These fluctuations are primarily due to the following factors:

| • |  | There are fewer calendar days in the first and second quarters of the year, as compared to the third and fourth quarters of the year. Because we provide services in NICUs on a 24-hours-a-day basis, 365 days a year, any reduction in service days will have a corresponding reduction in net revenue.

| • |  | The majority of physician services provided by our office-based and anesthesia practices consist of office visits and scheduled procedures that occur during business hours. As a result, volumes at those practices fluctuate based on the number of business days in each calendar quarter.

| • |  | A significant number of our employees and our associated professional contractors, primarily physicians, exceed the level of taxable wages for social security during the first and second quarters of the year. As a result, we incur a significantly higher payroll tax burden and our net income is lower during those quarters.

We have significant fixed operating costs, including physician compensation, and, as a result, are highly dependent on patient volume and capacity utilization of our affiliated professional contractors to sustain profitability. Additionally, quarterly results may be affected by the timing of acquisitions and fluctuations in

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patient volume. As a result, the operating results for any quarter are not necessarily indicative of results for any future period or for the full year. Our unaudited quarterly results are presented in further detail in Note 17 to our Consolidated Financial Statements in this Form 10-K.

Application of Critical Accounting Policies and Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires estimates and assumptions that affect the reporting of assets, liabilities, revenue and expenses, and the disclosure of contingent assets and liabilities. Note 2 to our Consolidated Financial Statements provides a summary of our significant accounting policies, which are all in accordance with GAAP. Certain of our accounting policies are critical to understanding our Consolidated Financial Statements because their application requires management to make assumptions about future results and depends to a large extent on management’s judgment, because past results have fluctuated and are expected to continue to do so in the future.

We believe that the application of the accounting policies described in the following paragraphs is highly dependent on critical estimates and assumptions that are inherently uncertain and highly susceptible to change. For all of these policies, we caution that future events rarely develop exactly as estimated, and the best estimates routinely require adjustment. On an ongoing basis, we evaluate our estimates and assumptions, including those discussed below.

Revenue Recognition

We recognize patient service revenue at the time services are provided by our affiliated physicians. Our performance obligations relate to the delivery of services to patients and are satisfied at the time of service. Accordingly, there are no performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period with respect to patient service revenue. Almost all of our patient service revenue is reimbursed by GHC Programs and third-party insurance payors. Payments for services rendered to our patients are generally less than billed charges. We monitor our revenue and receivables from these sources and record an estimated contractual allowance to properly account for the anticipated differences between billed and reimbursed amounts.

Accordingly, patient service revenue is presented net of an estimated provision for contractual adjustments and uncollectibles. Management estimates allowances for contractual adjustments and uncollectibles on accounts receivable based upon historical experience and other factors, including days sales outstanding (“DSO”) for accounts receivable, evaluation of expected adjustments and delinquency rates, past adjustments and collection experience in relation to amounts billed, an aging of accounts receivable, current contract and reimbursement terms, changes in payor mix and other relevant information. Collection of patient service revenue we expect to receive is normally a function of providing complete and correct billing information to the GHC Programs and third-party insurance payors within the various filing deadlines and typically occurs within 30 to 60 days of billing. Contractual adjustments result from the difference between the physician rates for services performed and the reimbursements by GHC Programs and third-party insurance payors for such services. The evaluation of these historical and other factors involves complex, subjective judgments. On a routine basis, we compare our cash collections to recorded net patient service revenue and evaluate our historical allowance for contractual adjustments and uncollectibles based upon the ultimate resolution of the accounts receivable balance. These procedures are completed regularly in order to monitor our process of establishing appropriate reserves for contractual adjustments. We have not recorded any material adjustments to prior period contractual adjustments and uncollectibles in the years ended December 31, 2018, 2017 or 2016.

Some of our agreements require hospitals to pay us administrative fees. Some agreements provide for fees if the hospital does not generate sufficient patient volume in order to guarantee that we receive a specified minimum revenue level. We also receive fees from hospitals for administrative services performed by our affiliated physicians providing medical director or other services at the hospital.

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In addition, we generate revenue through our management services organization for services rendered under various coding and billing contracts. Contract terms are specific to each customer and may include a combination of a flat fee for coding of medical charts, a fixed fee per patient, visit as well as a percentage of cash collections received by the providers. Revenue for flat and fixed fee arrangements is recognized in the month the coding occurs or the patient visit occurs. Revenue for percentage fees are recognized in the month that cash is collected for customers from payors.

DSO is one of the key factors that we use to evaluate the condition of our accounts receivable and the related allowances for contractual adjustments and uncollectibles. DSO reflects the timeliness of cash collections on billed revenue and the level of reserves on outstanding accounts receivable. Any significant change in our DSO results in additional analyses of outstanding accounts receivable and the associated reserves. We calculate our DSO using a three-month rolling average of net revenue. Our net revenue, net income and operating cash flows may be materially and adversely affected if actual adjustments and uncollectibles exceed management’s estimated provisions as a result of changes in these factors. As of December 31, 2018, our DSO was 53.5 days. We had approximately $2.0 billion in gross accounts receivable outstanding at December 31, 2018, and considering this outstanding balance, based on our historical experience, a reasonably likely change of 0.5% to 1.50% in our estimated collection rate would result in an impact to net revenue of $10.2 million to $30.5 million. The impact of this change does not include adjustments that may be required as a result of audits, inquiries and investigations from government authorities and agencies and other third-party payors that may occur in the ordinary course of business. See Note 16 to our Consolidated Financial Statements in this Form 10-K.

Professional Liability Coverage

We maintain professional liability insurance policies with third-party insurers generally on a claims-made basis, subject to self-insured retention, exclusions and other restrictions. Our self-insured retention under our professional liability insurance program is maintained primarily through a wholly owned captive insurance subsidiary. We record liabilities for self-insured amounts and claims incurred but not reported based on an actuarial valuation using historical loss information, claim emergence patterns and various actuarial assumptions. Liabilities for claims incurred but not reported are not discounted. The average lag period from the date a claim is reported to the date it reaches final settlement is approximately four years, although the facts and circumstances of individual claims could result in lag periods that vary from this average. Our actuarial assumptions incorporate multiple complex methodologies to determine the best liability estimate for claims incurred but not reported and the future development of known claims, including methodologies that focus on industry trends, paid loss development, reported loss development and industry-based expected pure premiums. The most significant assumptions used in the estimation process include the use of loss development factors to determine the future emergence of claim liabilities, the use of frequency and trend factors to estimate the impact of economic, judicial and social changes affecting claim costs, and assumptions regarding legal and other costs associated with the ultimate settlement of claims. The key assumptions used in our actuarial valuations are subject to constant adjustments as a result of changes in our actual loss history and the movement of projected emergence patterns as claims develop. We evaluate the need for professional liability insurance reserves in excess of amounts estimated in our actuarial valuations on a routine basis, and as of December 31, 2018, based on our historical experience, a reasonably likely change of 4% to 8% in our estimates would result in an increase or decrease to net income of $4.0 million to $7.8 million. However, because many factors can affect historical and future loss patterns, the determination of an appropriate professional liability reserve involves complex, subjective judgment, and actual results may vary significantly from estimates.

Goodwill

We record acquired assets, including identifiable intangible assets and liabilities at their respective fair values, recording to goodwill the excess of purchase price over the fair value of the net assets acquired. We test goodwill for impairment at a reporting unit level on an annual basis, and more frequently if impairment indicators exist. We use a single-step quantitative test with any goodwill impairment measured as the amount by

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which a reporting unit’s carrying value exceeds its fair value. We use income and market-based valuation approaches to determine the fair value of our reporting units. These approaches focus on discounted cash flows and market multiples based on our market capitalization to derive the fair value of a reporting unit. We also consider the economic outlook for the healthcare services industry and various other factors during the testing process, including hospital and physician contract changes, local market developments, changes in third-party payor payments, and other publicly available information.

Other Matters

Other significant accounting policies, not involving the same level of measurement uncertainties as those discussed above, are nevertheless important to an understanding of our Consolidated Financial Statements. For example, our Consolidated Financial Statements are presented on a consolidated basis with our affiliated professional contractors because we or one of our subsidiaries have entered into management agreements with our affiliated professional contractors meeting the “controlling financial interest” criteria set forth in accounting guidance for consolidations. Our management agreements are further described in Note 2 to our Consolidated Financial Statements in this Form 10-K. The policies described in Note 2 often require difficult judgments on complex matters that are often subject to multiple sources of authoritative guidance and are frequently reexamined by accounting standards setters and regulators. See “New Accounting Pronouncements” below for matters that may affect our accounting policies in the future.

Non-GAAP Measures

In our analysis of our results of operations, we use certain non-GAAP financial measures. Earnings before interest, taxes and depreciation and amortization (“EBITDA”) consists of net income attributable to MEDNAX, Inc. before interest expense, income tax provision and depreciation and amortization. Prior to the fourth quarter of 2017, we had included immaterial investment and other income and equity in earnings of unconsolidated affiliates as a component of the interest expense adjustment within EBITDA. Beginning with the fourth quarter of 2017, we excluded these items such that the interest expense adjustment represents only interest expense and conformed its historical EBITDA calculations accordingly. Adjusted earnings per common share (“Adjusted EPS”) consists of diluted net income attributable to MEDNAX, Inc. per common and common equivalent share adjusted for amortization expense and stock-based compensation expense. Adjusted EPS for the year ended December 31, 2017 excludes the net income tax benefit related to the reduction in our net deferred tax liability resulting from the reduction in the corporate tax rate enacted in December 2017 under the Tax Cuts and Jobs Act of 2017. Additionally, Adjusted EPS for the year ended December 31, 2016 excludes the net income tax benefit resulting from the reversal of a liability for uncertain tax positions related to the favorable settlement of a tax matter during the third quarter of 2016.

We believe these measures, in addition to income from operations, net income attributable to MEDNAX, Inc. and diluted net income attributable to MEDNAX, Inc. per common and common equivalent share, provide investors with useful supplemental information to compare and understand our underlying business trends and performance across reporting periods on a consistent basis. These measures should be considered a supplement to, and not a substitute for, financial performance measures determined in accordance with GAAP. In addition, since these non-GAAP measures are not determined in accordance with GAAP, they are susceptible to varying calculations and may not be comparable to other similarly titled measures of other companies.

For a reconciliation of each of EBITDA and Adjusted EPS to the most directly comparable GAAP measures for the years ended December 31, 2018, 2017 and 2016, refer to the tables below (in thousands, except per share data). In addition, historical reconciliations of EBITDA and Adjusted EPS are available on our internet website at

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www.mednax.com under the Investors tab. Our internet website and the information contained therein or connected thereto are not incorporated into or deemed a part of this Form 10-K.

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Net income attributable to MEDNAX, Inc. |  | $ | 268,629 |  |  | $ | 320,372 |  |  | $ | 324,914 |
Interest expense |  |  | 88,769 |  |  |  | 74,559 |  |  |  | 63,092 |
Income tax provision |  |  | 100,210 |  |  |  | 90,050 |  |  |  | 189,203 |
Depreciation and amortization |  |  | 111,281 |  |  |  | 102,879 |  |  |  | 89,264 |
EBITDA |  | $ | 568,889 |  |  | $ | 587,860 |  |  | $ | 666,473 |

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted average diluted shares outstanding |  |  | 91,606 |  |  |  | 92,958 |  |  |  | 93,109 |
Net income and diluted net income per share attributable to MEDNAX, Inc. |  | $ | 268,629 |  |  | $ | 2.93 |  |  | $ | 320,372 |  |  | $ | 3.45 |  |  | $ | 324,914 |  |  | $ | 3.49 |
Adjustments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization (net of tax of $19,780, $26,902 and $23,443) |  |  | 53,020 |  |  |  | 0.58 |  |  |  | 42,079 |  |  |  | 0.45 |  |  |  | 36,873 |  |  |  | 0.39 |
Stock-based compensation (net of tax of $10,516, $11,534 and $13,216) |  |  | 28,187 |  |  |  | 0.31 |  |  |  | 18,039 |  |  |  | 0.19 |  |  |  | 20,784 |  |  |  | 0.22 |
Income tax benefits |  |  | — |  |  |  | — |  |  |  | (70,014 | ) |  |  | (0.75 | ) |  |  | (10,646 | ) |  |  | (0.11 | )
Adjusted net income and diluted EPS |  | $ | 349,836 |  |  | $ | 3.82 |  |  | $ | 310,476 |  |  | $ | 3.34 |  |  | $ | 371,925 |  |  | $ | 3.99 |

RESULTS OF OPERATIONS

The following table sets forth, for the periods indicated, certain information related to our operations expressed as a percentage of our net revenue:

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Net revenue |  |  | 100.0 | % |  |  | 100.0 | % |  |  | 100.0 | %
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits |  |  | 69.5 |  |  |  | 67.6 |  |  |  | 63.8 |
Practice supplies and other operating expenses |  |  | 3.4 |  |  |  | 3.5 |  |  |  | 3.7 |
General and administrative expenses |  |  | 11.9 |  |  |  | 12.1 |  |  |  | 11.7 |
Depreciation and amortization |  |  | 3.0 |  |  |  | 2.9 |  |  |  | 2.8 |
Total operating expenses |  |  | 87.8 |  |  |  | 86.1 |  |  |  | 82.0 |
Income from operations |  |  | 12.2 |  |  |  | 13.9 |  |  |  | 18.0 |
Non-operating expense, net |  |  | 2.1 |  |  |  | 2.0 |  |  |  | 1.8 |
Income before income taxes |  |  | 10.1 |  |  |  | 11.9 |  |  |  | 16.2 |
Income tax provision |  |  | 2.7 |  |  |  | 2.6 |  |  |  | 6.0 |
Net income |  |  | 7.4 | % |  |  | 9.3 | % |  |  | 10.2 | %

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Year Ended December 31, 2018 as Compared to Year Ended December 31, 2017

Our net revenue increased $188.8 million, or 5.5%, to $3.65 billion for the year ended December 31, 2018, as compared to $3.46 billion for 2017. Of this increase, $102.1 million, or 2.8%, was attributable to revenue generated from acquisitions completed after December 31, 2016. Same-unit net revenue increased $86.7 million, or 2.7%, for the year ended December 31, 2018. Same units are those units at which we provided services for the entire current period and the entire comparable period. The increase in same-unit net revenue was comprised of a net increase of $49.6 million, or 1.5%, related to net reimbursement-related factors and an increase of $37.1 million, or 1.2%, from patient service volumes. The net increase in revenue related to net reimbursement-related factors was primarily due to modest improvements in managed care contracting, an increase in the administrative fees received from our hospital partners and the flow through of revenue from modest price increases, partially offset by a decrease in revenue caused by an increase in the percentage of our patients enrolled in GHC Programs. The increase in revenue from patient service volumes was related to growth across almost all of our services.

Practice salaries and benefits increased $197.9 million, or 8.5%, to $2.54 billion for the year ended December 31, 2018, as compared to $2.34 billion for 2017. This increase was primarily attributable to increased costs associated with physicians and other staff to support acquisition-related growth, organic growth initiatives and growth at our existing units, of which $157.5 million was related to salaries and $40.4 million was related to benefits and incentive compensation. Included within practice salaries and benefits expense in 2018 is $18.1 million for certain physicians who remained employed through December 31, 2018 despite the non-renewal of an anesthesia services contract effective July 1, 2018, under which they had previously provided services. We anticipate that we will continue to experience a higher rate of growth in clinician compensation expense at our existing units over historic averages, which could adversely affect our business, financial condition, results of operations, cash flows and the trading price of our securities.

Practice supplies and other operating expenses increased $1.5 million, or 1.3%, to $122.0 million for the year ended December 31, 2018, as compared to $120.5 million for 2017. The increase was primarily attributable to practice supply, rent and other costs related to our acquisitions.

General and administrative expenses include all billing and collection functions and all other salaries, benefits, supplies and operating expenses not specifically related to the day-to-day operations of our physician practices and services, as well as those attributable to our non-physician service businesses. General and administrative expenses increased $15.3 million, or 3.7%, to $432.4 million for the year ended December 31, 2018, as compared to $417.1 million for 2017. The increase is attributable to the overall growth of the Company, including growth from acquisitions. Included within general and administrative expenses was an increase of $9.3 million of stock-based compensation expense primarily resulting from the change in timing of our annual equity grants from June to March in order to align the timing with other compensation related activities. General and administrative expenses also includes a decrease of $25.0 million resulting from cost improvements as part of our shared services initiative. General and administrative expenses as a percentage of net revenue was 11.9% for the year ended December 31, 2018, as compared to 12.1% for the same period in 2017.

Depreciation and amortization expense increased $8.4 million, or 8.2%, to $111.3 million for the year ended December 31, 2018, as compared to $102.9 million for 2017. The increase was primarily attributable to the amortization of intangible assets related to acquisitions.

Income from operations decreased $34.3 million, or 7.1%, to $445.8 million for the year ended December 31, 2018, as compared to $480.1 million for 2017. Our operating margin was 12.2% for the year ended December 31, 2018, as compared to 13.9% for 2017. The decrease of 166 basis points was primarily due to the impact of the non-renewal of an anesthesia services contract effective July 1, 2018, as well as higher operating expense growth as compared to revenue growth.

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Net non-operating expenses were $77.0 million for the year ended December 31, 2018, as compared to $69.7 million for 2017. The net increase in non-operating expenses was primarily related to an increase in interest expense due to a higher effective interest rate on borrowings outstanding under our Credit Agreement.

Our effective income tax rate was 27.2% for the year ended December 31, 2018, as compared to 21.9% for 2017. Our effective income tax rate in 2017 was impacted by a $70.0 million income tax benefit resulting from the reduction of our net deferred tax liability related to the reduction in the corporate tax rate enacted under the Tax Cuts and Jobs Act of 2017 during the fourth quarter of 2017.

Net income was $268.6 million for the year ended December 31, 2018, as compared to $320.4 million for 2017. EBITDA was $568.9 million for the year ended December 31, 2018, as compared to $587.9 million for 2017.

Diluted net income per common and common equivalent share was $2.93 on weighted average shares outstanding of 91.6 million for the year ended December 31, 2018, as compared to $3.45 on weighted average shares outstanding of 93.0 million for 2017. Adjusted EPS was $3.82 for the year ended December 31, 2018, as compared to $3.34 for 2017. The decrease of 1.4 million in our weighted average shares outstanding is primarily due to the impact of shares repurchased under our accelerated share repurchase program.

Year Ended December 31, 2017 as Compared to Year Ended December 31, 2016

Our net revenue increased $275.2 million, or 8.6%, to $3.46 billion for the year ended December 31, 2017, as compared to $3.18 billion for 2016. Of this $275.2 million increase, $256.0 million, or 7.9%, was attributable to revenue generated from acquisitions completed after December 31, 2015. Same-unit net revenue increased $19.1 million, or 0.7%, for the year ended December 31, 2017. Same units are those units at which we provided services for the entire current period and the entire comparable period. The increase in same-unit net revenue was comprised of a net increase of $11.7 million, or 0.4%, related to net reimbursement-related factors and an increase in revenue of $7.4 million, or 0.3%, from patient service volumes. The net increase in revenue of $11.7 million related to net reimbursement-related factors was primarily due to modest improvements in managed care contracting and an increase in the administrative fees received from our hospital partners, partially offset by a decrease in revenue caused by an increase in the percentage of our patients enrolled in GHC Programs. The increase in revenue of $7.4 million from patient service volumes was primarily related to growth across our anesthesiology, neonatology and maternal-fetal medicine services, partially offset by a decrease in our other pediatric services, primarily hearing screen services.

Practice salaries and benefits increased $306.5 million, or 15.1%, to $2.34 billion for the year ended December 31, 2017, as compared to $2.03 billion for 2016. This $306.5 million increase was primarily attributable to increased costs associated with new physicians and other staff to support acquisition-related growth and growth at existing units, of which $230.6 million was related to salaries and $75.9 million was related to benefits and incentive compensation. Included within the increase in salaries expense at our existing units were costs related to clinician compensation that increased at a faster rate than in previous periods. We anticipate that we will continue to experience a higher rate of growth in clinician compensation expense, which could adversely affect our business, financial condition, results of operations, cash flows and the trading price of our securities. Included within the increase in benefits expense were increased costs related to malpractice expense driven by unfavorable claims experience.

Practice supplies and other operating expenses increased $2.1 million, or 1.8%, to $120.5 million for the year ended December 31, 2017, as compared to $118.4 million for 2016. The increase was attributable to practice supply, rent and other costs related to our acquisitions, partially offset by a decrease at our existing units. The decrease at our existing units was primarily attributable to the reclassification of certain temporary staffing costs from practice operating expenses to practice salaries in 2017.

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General and administrative expenses include all billing and collection functions and all other salaries, benefits, supplies and operating expenses not specifically related to the day-to-day operations of our physician practices and services, as well as those attributable to our non-physician service businesses. General and administrative expenses increased $44.5 million, or 12.0%, to $417.1 million for the year ended December 31, 2017, as compared to $372.6 million for 2016. The increase of $44.5 million is attributable to the overall growth of the Company. General and administrative expenses as a percentage of net revenue was 12.1% for the year ended December 31, 2017, as compared to 11.7% for the same period in 2016.

Depreciation and amortization expense increased $13.6 million, or 15.3%, to $102.9 million for the year ended December 31, 2017, as compared to $89.3 million for 2016. The increase was primarily attributable to the amortization of intangible assets related to acquisitions.

Income from operations decreased $91.6 million, or 16.0%, to $480.1 million for the year ended December 31, 2017, as compared to $571.7 million for 2016. Our operating margin was 13.9% for the year ended December 31, 2017, as compared to 18.0% for 2016. The decrease of 408 basis points was primarily due to increases in operating expenses and lower same-unit revenue.

Net non-operating expenses were $69.7 million for the year ended December 31, 2017, as compared to $57.9 million for 2016. The net increase in non-operating expenses was primarily related to an increase in interest expense due to higher average borrowings outstanding under our Credit Agreement.

Our effective income tax rate was 21.9% for the year ended December 31, 2017, as compared to 36.8% for 2016. After excluding a $70.0 million income tax benefit resulting from the reduction of our net deferred tax liability resulting from the reduction in the corporate tax rate enacted under the Tax Cuts and Jobs Act of 2017 during the fourth quarter of 2017, our effective income tax rate for the year ended December 31, 2017 was 39.0%. After excluding a $10.6 million income tax benefit resulting from the reversal of a liability for uncertain tax positions related to the favorable settlement of a tax matter during the third quarter of 2016, our effective income tax rate for the year ended December 31, 2016 was 38.9%. We believe that excluding the favorable impacts on our effective income tax rate related to these income tax benefits provides a more comparable view of our effective income tax rate. After excluding these favorable impacts, our effective tax rate was relatively unchanged.

Net income attributable to MEDNAX, Inc. was $320.4 million for the year ended December 31, 2017, as compared to $324.9 million for 2016. EBITDA was $587.9 million for the year ended December 31, 2017, as compared to $666.5 million for 2016.

Diluted net income attributable to MEDNAX, Inc. per common and common equivalent share was $3.45 on weighted average shares outstanding of 93.0 million for the year ended December 31, 2017, as compared to $3.49 on weighted average shares outstanding of 93.1 million for 2016. Adjusted EPS was $3.34 for the year ended December 31, 2017, as compared to $3.99 for 2016.

LIQUIDITY AND CAPITAL RESOURCES

As of December 31, 2018, we had $36.7 million of cash and cash equivalents on hand as compared to $60.2 million at December 31, 2017. Additionally, we had working capital of $157.2 million at December 31, 2018, an increase of $61.4 million from our working capital of $95.8 million at December 31, 2017. This net increase in working capital is primarily due to 2018 earnings, partially offset by the use of funds for repurchases of our common stock and acquisitions.

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Cash Flows

Cash provided by (used in) operating, investing and financing activities is summarized as follows (in thousands):

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Operating activities |  | $ | 289,925 |  |  | $ | 511,378 |  |  | $ | 443,778 |
Investing activities |  |  | (142,769 | ) |  |  | (576,613 | ) |  |  | (821,217 | )
Financing activities |  |  | (170,611 | ) |  |  | 89,737 |  |  |  | 381,565 |

Operating Activities

We generated cash flow from operating activities of $289.9 million, $511.4 million and $443.8 million for the years ended December 31, 2018, 2017 and 2016, respectively. The net decrease of $221.5 million in cash flow provided from operating activities for the year ended December 31, 2018, as compared to the year ended December 31, 2017, was primarily due to a decrease in cash flow from income taxes payable resulting from tax payments made in the first quarter of 2018 for 2017 taxes that were deferred by the Internal Revenue Service for companies impacted by the 2017 hurricanes as well as a net decrease in cash flow related to accounts receivable, partially offset by an increase in cash flow related to changes in deferred taxes.

During the year ended December 31, 2018, cash flow from accounts receivable decreased by $44.4 million, as compared to an increase of $41.8 million for 2017. The decrease in cash flow from accounts receivable was primarily due to an increase in DSO related to higher accounts receivable balances primarily at our existing units.

Our cash flow from operating activities is significantly affected by the payment of physician incentive compensation. A large majority of our affiliated physicians participate in our performance-based incentive compensation program and almost all of the payments due under the program are made annually in the first quarter. As a result, we typically experience negative cash flow from operations in the first quarter of each year and fund our operations during this period with cash on hand or funds borrowed under our Credit Agreement. In addition, during the first quarter of each year, we use cash to make any discretionary matching contributions for participants in our qualified contributory savings plans.

We generated cash flow from operating activities of $511.4 million and $443.8 million for the years ended December 31, 2017 and 2016, respectively. Cash flow for the year ended December 31, 2017 was impacted by changes in the components of income taxes payable, accounts receivable and professional liability reserves. Cash flow for the year ended December 31, 2016 was impacted by an increase in the adjustment to net income for non-cash depreciation and amortization expense, a net increase in cash flow related to changes in the components of our accounts payable and accrued expenses and an increase in cash flow related to accounts receivable.

Investing Activities

During the year ended December 31, 2018, our net cash used in investing activities of $142.8 million primarily included acquisition payments of $114.5 million, capital expenditures of $48.9 million and net purchases of $2.2 million related to the purchase and maturity of investments, partially offset by proceeds of $22.8 million related to the sale of the controlling interest in a group of assets to a third party.

Financing Activities

During the year ended December 31, 2018, our net cash used in financing activities of $170.6 million consisted primarily of net repayments on our Credit Agreement of $371.0 million and the repurchase of $302.2 million of our common stock, partially offset by proceeds from our 2027 Notes of $500.0 million.

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Liquidity

Our Credit Agreement provides for a $2.0 billion unsecured revolving credit facility and includes a $37.5 million sub-facility for the issuance of letters of credit. In November 2018, we amended and restated our Credit Agreement to make certain technical, conforming and other changes. The Credit Agreement matures on October 31, 2022 and is guaranteed by substantially all of our subsidiaries and affiliated professional associations and corporations. At our option, borrowings under the Credit Agreement will bear interest at (i) the alternate base rate (defined as the higher of (a) the prime rate, (b) the Federal Funds Rate plus 1/2 of 1.00% and (c) LIBOR for an interest period of one month plus 1.00%) plus an applicable margin rate ranging from 0.125% to 0.750% based on our consolidated leverage ratio or (ii) the LIBOR rate plus an applicable margin rate ranging from 1.125% to 1.750% based on our consolidated leverage ratio. The Credit Agreement also calls for other customary fees and charges, including an unused commitment fee ranging from 0.150% to 0.300% of the unused lending commitments, based on our consolidated leverage ratio. The Credit Agreement contains customary covenants and restrictions, including covenants that require us to maintain a minimum interest charge ratio, not to exceed a specified consolidated leverage ratio and to comply with laws, and restrictions on the ability to pay dividends and make certain other distributions, as specified therein. Failure to comply with these covenants would constitute an event of default under the Credit Agreement, notwithstanding the ability of the company to meet its debt service obligations. The Credit Agreement also includes various customary remedies for the lenders following an event of default, including the acceleration of repayment of outstanding amounts under the Credit Agreement.

At December 31, 2018, we had an outstanding principal balance of $739.5 million on our Credit Agreement. We also had outstanding letters of credit of $0.2 million that reduced the amount available on our Credit Agreement to $1.3 billion at December 31, 2018.

In November 2018, we completed a private offering of $500.0 million aggregate principal amount of 2027 Notes. At December 31, 2018, we also had an outstanding principal balance of $750.0 million on our 5.25% senior unsecured notes due 2023 (the “2023 Notes”). Our obligations under the 2023 Notes and the 2027 Notes are guaranteed on an unsecured senior basis by the same subsidiaries and affiliated professional contractors that guarantee our Credit Agreement. Interest on the 2027 Notes accrues at the rate of 6.25% per annum, or $31.3 million, and is payable semi-annually in arrears on January 15 and July 15, beginning on January 15, 2019. Interest on the 2023 Notes accrues at the rate of 5.25% per annum, or $39.4 million, and is payable semi-annually in arrears on June 1 and December 1.

The indenture under which the 2023 Notes and the 2027 Notes are issued, among other things, limits our ability to (1) incur liens and (2) enter into sale and lease-back transactions, and also limits our ability to merge or dispose of all or substantially all of our assets, in all cases, subject to a number of customary exceptions. Although we are not required to make mandatory redemption or sinking fund payments with respect to the 2023 Notes and the 2027 Notes, upon the occurrence of a change in control of MEDNAX, we may be required to repurchase the 2023 Notes and the 2027 Notes at a purchase price equal to 101% of the aggregate principal amount of the 2023 Notes and the 2027 Notes repurchased plus accrued and unpaid interest.

At December 31, 2018, we believe we were in compliance, in all material respects, with the financial covenants and other restrictions applicable to us under the Credit Agreement and the 2023 Notes and the 2027 Notes.

The exercise of employee stock options and the purchase of common stock by employees participating in our ESPP and SPP generated cash proceeds of $16.3 million, $23.3 million, and $22.0 million for the years ended December 31, 2018, 2017 and 2016, respectively. Because stock option exercises and purchases under the ESPP and SPP are dependent on several factors, including the market price of our common stock, we cannot predict the timing and amount of any future proceeds.

We maintain professional liability insurance policies with third-party insurers, subject to self-insured retention, exclusions and other restrictions. We self-insure our liabilities to pay self-insured retention amounts

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under our professional liability insurance coverage through a wholly owned captive insurance subsidiary. We record liabilities for self-insured amounts and claims incurred but not reported based on an actuarial valuation using historical loss information, claim emergence patterns and various actuarial assumptions. Our total liability related to professional liability risks at December 31, 2018 was $244.0 million, of which $34.9 million is classified as a current liability within accounts payable and accrued expenses in the Consolidated Balance Sheet. In addition, there is a corresponding insurance receivable of $16.7 million recorded as a component of other assets for certain professional liability claims that are covered by insurance policies.

We anticipate that funds generated from operations, together with our current cash on hand and funds available under our Credit Agreement, will be sufficient to finance our working capital requirements, fund anticipated acquisitions and capital expenditures, fund expenses related to our transformational and restructuring activities, fund our share repurchase programs and meet our contractual obligations as described below for at least the next 12 months from the date of issuance of this Form 10-K.

CONTRACTUAL OBLIGATIONS

At December 31, 2018, we had the following obligations and commitments (in thousands):

|  | Payments Due |
Obligation |  | Total |  |  | 2019 |  |  | 2020 and 2021 |  |  | 2022 and 2023 |  |  | 2024 and Later |
Credit Agreement (1) |  | $ | 873,710 |  |  | $ | 35,041 |  |  | $ | 70,081 |  |  | $ | 768,588 |  |  | $ | — |
Senior Notes (1) |  |  | 1,694,792 |  |  |  | 70,625 |  |  |  | 141,250 |  |  |  | 887,969 |  |  |  | 594,948 |
Capital leases |  |  | 441 |  |  |  | 253 |  |  |  | 188 |  |  |  | — |  |  |  | — |
Operating leases |  |  | 103,478 |  |  |  | 30,824 |  |  |  | 39,984 |  |  |  | 22,148 |  |  |  | 10,522 |
|  | $ | 2,672,421 |  |  | $ | 136,743 |  |  | $ | 251,503 |  |  | $ | 1,678,705 |  |  | $ | 605,470 |

(1) | Amounts include interest payments at the applicable rate as of December 31, 2018 and assume the amount outstanding under our Credit Agreement as of December 31, 2018 will be paid on the maturity date and amounts outstanding under the 2023 Notes and the 2027 Notes will be paid on their maturity dates of December 1, 2023 and January 15, 2027, respectively.

Certain of our acquisition agreements contain contingent consideration provisions based on volume and other performance measures over an up to five-year period. Potential payments under these provisions are not contingent upon the future employment of the sellers. As of December 31, 2018, cash payments of up to $20.6 million may be due through 2020 under all contingent consideration provisions as follows (in thousands):

2019 |  | $ | 17,900 |
2020 |  |  | 2,700 |
|  | $ | 20,600 |

At December 31, 2018, our total liability for uncertain tax positions was $12.3 million, all of which is included within other liabilities on our Consolidated Balance Sheets. The timing and amount of future cash flows for each year beyond 2018 cannot be reasonably estimated. See Note 11 to our Consolidated Financial Statements in this Form 10-K for more information regarding our uncertain tax positions.

OFF-BALANCE SHEET ARRANGEMENTS

At December 31, 2018, we leased, under operating lease agreements, space in hospitals and other facilities for our business and medical offices, as well as certain equipment necessary for business operations, which are included in the table above. We did not have any other off-balance sheet arrangements that have or are reasonably likely to have a current or future effect on our financial condition, changes in financial condition, revenue or expenses, results of operations, liquidity, capital expenditures or capital resources.

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RECENTLY ADOPTED ACCOUNTING PRONOUNCEMENTS

In May 2014, the accounting guidance related to revenue recognition was amended to outline a single, comprehensive model for accounting for revenue from contracts with customers. The core principle of the new accounting guidance is to require an entity to recognize as revenue the amount that reflects the consideration to which it expects to be entitled in exchange for goods or services as it transfers control to its customers. The guidance became effective for us on January 1, 2018 and was adopted on a full retrospective basis. The primary change for healthcare providers under the new guidance is the requirement to report the allowance for uncollectibles associated with patient responsibility amounts as a reduction in net revenue as opposed to bad debt expense, a component of operating expenses. The guidance also requires increased disclosures, including qualitative and quantitative disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We had historically included the allowance for uncollectibles associated with patient responsibility amounts with our allowance for contractual adjustments as a reduction in net revenue as such amounts are not material. Accordingly, the adoption of this guidance did not have an impact on our Consolidated Financial Statements, other than the increased financial statement disclosures.

NEW ACCOUNTING PRONOUNCEMENTS

In February 2016, the accounting guidance related to leases was issued that will require an entity to recognize leased assets and the rights and obligations created by those leased assets on the balance sheet and to disclose key information about the entity’s leasing arrangements. This guidance became effective for us on January 1, 2019, with early adoption permitted. We expect that the adoption of this guidance will have a material impact on our Consolidated Balance Sheets and related disclosures, resulting from the recognition of significant right of use assets and related liabilities primarily related to our operating lease arrangements for space in hospitals and certain other facilities for its business and medical offices. We have completed the review of our existing lease portfolio and have accumulated all of the necessary information required to properly account for leases under the new guidance. We have implemented a cloud-based software application, inclusive of a lease administration module and an accounting module. We are in the process of finalizing workflows, business processes and internal controls surrounding the new lease accounting process in order to meet the reporting and disclosure requirements.

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ITEM 7A. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are subject to market risk primarily from exposure to changes in interest rates based on our financing, investing and cash management activities. We intend to manage interest rate risk through the use of a combination of fixed rate and variable rate debt. We borrow under our Credit Agreement at various interest rate options based on the Alternate Base Rate or LIBOR rate depending on certain financial ratios. At December 31, 2018, the outstanding principal balance on our Credit Agreement was $739.5 million, and considering this outstanding balance, a 1% change in interest rates would result in an impact to income before income taxes of $7.4 million per year.

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ITEM 8. | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The following Consolidated Financial Statements and Financial Statement Schedule of MEDNAX, Inc. and its subsidiaries are included in this Form 10-K on the pages set forth below:

INDEX TO FINANCIAL STATEMENTS

AND FINANCIAL STATEMENT SCHEDULE

|  | Page |
Consolidated Financial Statements |  |  |  |
Report of Independent Registered Certified Public Accounting Firm |  |  | 67 |
Consolidated Balance Sheets at December 31, 2018 and 2017 |  |  | 69 |
Consolidated Statements of Income for the Years Ended December 31, 2018, 2017 and 2016 |  |  | 70 |
Consolidated Statements of Equity for the Years Ended December 31, 2018, 2017 and 2016 |  |  | 71 |
Consolidated Statements of Cash Flows for the Years Ended December 31, 2018, 2017 and 2016 |  |  | 72 |
Notes to Consolidated Financial Statements |  |  | 73 |
Financial Statement Schedule |  |  |  |
Schedule II—Valuation and Qualifying Accounts for the Years Ended December 31, 2018, 2017 and 2016 |  |  | 99 |

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Report of Independent Registered Public Accounting Firm

To the Board of Directors and shareholders of

MEDNAX, Inc.

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of MEDNAX, Inc. and its subsidiaries (the “Company”) as of December 31, 2018 and December 31, 2017, and the related consolidated statements of income, equity, and cash flows for each of the three years in the period ended December 31, 2018, including the related notes and financial statement schedule listed in the accompanying index (collectively referred to as the “consolidated financial statements”). We also have audited the Company’s internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control—Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2018 and December 31, 2017, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2018, in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on criteria established in Internal Control—Integrated Framework (2013) issued by the COSO.

Basis for Opinions

The Company’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in Management’s Annual Report on Internal Control over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidated financial statements and on the Company’s internal control over financial reporting based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in

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accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ PricewaterhouseCoopers LLP

Miami, Florida

February 14, 2019

We have served as the Company’s auditor since 1999.

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MEDNAX, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands)

|  | December 31, |
|  | 2018 |  |  | 2017 |
ASSETS |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 36,745 |  |  | $ | 60,200 |
Restricted cash |  |  | 20,000 |  |  |  | — |
Short-term investments |  |  | 21,923 |  |  |  | 10,292 |
Accounts receivable, net |  |  | 542,272 |  |  |  | 503,999 |
Prepaid expenses |  |  | 18,763 |  |  |  | 15,584 |
Other current assets |  |  | 17,706 |  |  |  | 37,160 |
Total current assets |  |  | 657,409 |  |  |  | 627,235 |
Restricted cash |  |  | — |  |  |  | 20,000 |
Investments |  |  | 69,699 |  |  |  | 80,682 |
Property and equipment, net |  |  | 133,037 |  |  |  | 123,536 |
Goodwill |  |  | 4,382,995 |  |  |  | 4,283,963 |
Intangible assets, net |  |  | 588,312 |  |  |  | 639,928 |
Other assets |  |  | 103,459 |  |  |  | 91,934 |
Total assets |  | $ | 5,934,911 |  |  | $ | 5,867,278 |
LIABILITIES & SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Accounts payable and accrued expenses |  | $ | 469,342 |  |  | $ | 438,017 |
Current portion of long-term debt and capital lease obligations |  |  | 253 |  |  |  | 1,401 |
Income taxes payable |  |  | 30,598 |  |  |  | 92,007 |
Total current liabilities |  |  | 500,193 |  |  |  | 531,425 |
Line of credit |  |  | 739,500 |  |  |  | 1,110,500 |
Long-term debt and capital lease obligations, net |  |  | 1,234,780 |  |  |  | 740,923 |
Long-term professional liabilities |  |  | 209,060 |  |  |  | 212,274 |
Deferred income taxes |  |  | 131,240 |  |  |  | 147,797 |
Other liabilities |  |  | 32,254 |  |  |  | 57,905 |
Total liabilities |  |  | 2,847,027 |  |  |  | 2,800,824 |
Commitments and contingencies |  |  |  |  |  |  |  |
Shareholders’ equity: |  |  |  |  |  |  |  |
Preferred stock; $.01 par value; 1,000 shares authorized; none issued |  |  | — |  |  |  | — |
Common stock; $.01 par value; 200,000 shares authorized; 87,820 and 93,721 shares issued and outstanding, respectively |  |  | 878 |  |  |  | 937 |
Additional paid-in capital |  |  | 992,647 |  |  |  | 1,017,328 |
Retained earnings |  |  | 2,094,359 |  |  |  | 2,048,189 |
Total shareholders’ equity |  |  | 3,087,884 |  |  |  | 3,066,454 |
Total liabilities and shareholders’ equity |  | $ | 5,934,911 |  |  | $ | 5,867,278 |

The accompanying notes are an integral part of these Consolidated Financial Statements.

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MEDNAX, INC.

CONSOLIDATED STATEMENTS OF INCOME

(in thousands, except for per share data)

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Net revenue |  | $ | 3,647,123 |  |  | $ | 3,458,312 |  |  | $ | 3,183,159 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits |  |  | 2,535,588 |  |  |  | 2,337,734 |  |  |  | 2,031,220 |
Practice supplies and other operating expenses |  |  | 122,028 |  |  |  | 120,518 |  |  |  | 118,416 |
General and administrative expenses |  |  | 432,378 |  |  |  | 417,105 |  |  |  | 372,572 |
Depreciation and amortization |  |  | 111,281 |  |  |  | 102,879 |  |  |  | 89,264 |
Total operating expenses |  |  | 3,201,275 |  |  |  | 2,978,236 |  |  |  | 2,611,472 |
Income from operations |  |  | 445,848 |  |  |  | 480,076 |  |  |  | 571,687 |
Investment and other income |  |  | 4,935 |  |  |  | 3,953 |  |  |  | 2,019 |
Interest expense |  |  | (88,769 | ) |  |  | (74,559 | ) |  |  | (63,092 | )
Equity in earnings of unconsolidated affiliates |  |  | 6,825 |  |  |  | 952 |  |  |  | 3,185 |
Total non-operating expenses |  |  | (77,009 | ) |  |  | (69,654 | ) |  |  | (57,888 | )
Income before income taxes |  |  | 368,839 |  |  |  | 410,422 |  |  |  | 513,799 |
Income tax provision |  |  | (100,210 | ) |  |  | (90,050 | ) |  |  | (189,203 | )
Net income |  |  | 268,629 |  |  |  | 320,372 |  |  |  | 324,596 |
Net loss attributable to noncontrolling interests |  |  | — |  |  |  | — |  |  |  | 318 |
Net income attributable to MEDNAX, Inc. |  | $ | 268,629 |  |  | $ | 320,372 |  |  | $ | 324,914 |
Per common and common equivalent share data: |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to MEDNAX, Inc.: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 2.95 |  |  | $ | 3.47 |  |  | $ | 3.52 |
Diluted |  | $ | 2.93 |  |  | $ | 3.45 |  |  | $ | 3.49 |
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 91,104 |  |  |  | 92,431 |  |  |  | 92,422 |
Diluted |  |  | 91,606 |  |  |  | 92,958 |  |  |  | 93,109 |

The accompanying notes are an integral part of these Consolidated Financial Statements.

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MEDNAX, INC.

CONSOLIDATED STATEMENTS OF EQUITY

(in thousands)

|  | Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Number of Shares |  |  | Amount |  |  | Additional Paid-in Capital |  |  | Retained Earnings |  |  | Noncontrolling Interests |  |  | Total Equity |
Balance at December 31, 2015 |  |  | 93,739 |  |  | $ | 937 |  |  | $ | 926,235 |  |  | $ | 1,510,356 |  |  | $ | 318 |  |  | $ | 2,437,846 |
Net income (loss) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 324,914 |  |  |  | (318 | ) |  |  | 324,596 |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  |  | 473 |  |  |  | 5 |  |  |  | 22,017 |  |  |  | — |  |  |  | — |  |  |  | 22,022 |
Issuance of restricted stock |  |  | 505 |  |  |  | 5 |  |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | — |
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 34,000 |  |  |  | — |  |  |  | — |  |  |  | 34,000 |
Forfeitures of restricted stock |  |  | (53 | ) |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |
Repurchased common stock |  |  | (946 | ) |  |  | (9 | ) |  |  | (12,075 | ) |  |  | (49,744 | ) |  |  |  |  |  |  | (61,828 | )
Excess tax benefit related to employee stock incentive plans |  |  | — |  |  |  | — |  |  |  | 4,131 |  |  |  | — |  |  |  | — |  |  |  | 4,131 |
Balance at December 31, 2016 |  |  | 93,718 |  |  | $ | 937 |  |  | $ | 974,304 |  |  | $ | 1,785,526 |  |  | $ | — |  |  | $ | 2,760,767 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 320,372 |  |  |  | — |  |  |  | 320,372 |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  |  | 528 |  |  |  | 5 |  |  |  | 23,271 |  |  |  | — |  |  |  | — |  |  |  | 23,276 |
Issuance of restricted stock |  |  | 536 |  |  |  | 5 |  |  |  | (5 | ) |  |  | — |  |  |  | — |  |  |  | — |
Issuance of restricted stock for acquisition consideration |  |  | 69 |  |  |  | 1 |  |  |  | 2,657 |  |  |  | — |  |  |  | — |  |  |  | 2,658 |
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 29,573 |  |  |  | — |  |  |  | — |  |  |  | 29,573 |
Forfeitures of restricted stock |  |  | (92 | ) |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |
Repurchased common stock |  |  | (1,038 | ) |  |  | (10 | ) |  |  | (12,473 | ) |  |  | (57,709 | ) |  |  |  |  |  |  | (70,192 | )
Balance at December 31, 2017 |  |  | 93,721 |  |  | $ | 937 |  |  | $ | 1,017,328 |  |  | $ | 2,048,189 |  |  | $ | — |  |  | $ | 3,066,454 |
Net income |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 268,629 |  |  |  | — |  |  |  | 268,629 |
Common stock issued under employee stock option, employee stock purchase plan and stock purchase plan |  |  | 495 |  |  |  | 5 |  |  |  | 18,914 |  |  |  | — |  |  |  | — |  |  |  | 18,919 |
Issuance of restricted stock |  |  | 770 |  |  |  | 8 |  |  |  | (8 | ) |  |  | — |  |  |  | — |  |  |  | — |
Stock-based compensation expense |  |  | — |  |  |  | — |  |  |  | 38,703 |  |  |  | — |  |  |  | — |  |  |  | 38,703 |
Stock swaps |  |  | (56 | ) |  |  | (1 | ) |  |  | (2,660 | ) |  |  |  |  |  |  |  |  |  |  | (2,661 | )
Forfeitures of restricted stock |  |  | (69 | ) |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | — |
Repurchased common stock |  |  | (7,041 | ) |  |  | (70 | ) |  |  | (79,631 | ) |  |  | (222,459 | ) |  |  |  |  |  |  | (302,160 | )
Balance at December 31, 2018 |  |  | 87,820 |  |  | $ | 878 |  |  | $ | 992,647 |  |  | $ | 2,094,359 |  |  | $ | — |  |  | $ | 3,087,884 |

The accompanying notes are an integral part of these Consolidated Financial Statements.

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MEDNAX, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 268,629 |  |  | $ | 320,372 |  |  | $ | 324,596 |
Adjustments to reconcile net income to net cash provided from operating activities: |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  | 111,281 |  |  |  | 102,879 |  |  |  | 89,264 |
Amortization of premiums, discounts and issuance costs |  |  | 4,572 |  |  |  | 5,514 |  |  |  | 4,816 |
Stock-based compensation expense |  |  | 38,703 |  |  |  | 29,573 |  |  |  | 34,000 |
Deferred income taxes |  |  | (24,149 | ) |  |  | (60,073 | ) |  |  | 18,149 |
Other |  |  | (10,903 | ) |  |  | (3,783 | ) |  |  | 212 |
Changes in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable |  |  | (36,598 | ) |  |  | 7,803 |  |  |  | (34,000 | )
Prepaid expenses and other current assets |  |  | (5,472 | ) |  |  | (2,792 | ) |  |  | (783 | )
Other long-term assets |  |  | (395 | ) |  |  | (2,709 | ) |  |  | 10,035 |
Accounts payable and accrued expenses |  |  | 15,390 |  |  |  | 24,551 |  |  |  | 11,617 |
Income taxes payable |  |  | (61,256 | ) |  |  | 73,050 |  |  |  | (2,234 | )
Payments of contingent consideration liabilities |  |  | (1,093 | ) |  |  | (750 | ) |  |  | (1,037 | )
Long-term professional liabilities |  |  | (4,490 | ) |  |  | 18,478 |  |  |  | (3,452 | )
Other liabilities |  |  | (4,294 | ) |  |  | (735 | ) |  |  | (7,405 | )
Net cash provided from operating activities |  |  | 289,925 |  |  |  | 511,378 |  |  |  | 443,778 |
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |  |
Acquisition payments, net of cash acquired |  |  | (114,491 | ) |  |  | (531,696 | ) |  |  | (762,302 | )
Purchases of investments |  |  | (15,884 | ) |  |  | (27,723 | ) |  |  | (60,976 | )
Proceeds from maturities of investments |  |  | 13,710 |  |  |  | 25,410 |  |  |  | 41,325 |
Purchases of property and equipment |  |  | (48,868 | ) |  |  | (49,309 | ) |  |  | (39,264 | )
Proceeds from sale of controlling interest in assets |  |  | 22,764 |  |  |  | — |  |  |  | — |
Other |  |  | — |  |  |  | 6,705 |  |  |  | — |
Net cash used in investing activities |  |  | (142,769 | ) |  |  | (576,613 | ) |  |  | (821,217 | )
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |
Borrowings on credit agreement |  |  | 1,723,500 |  |  |  | 2,846,000 |  |  |  | 1,940,000 |
Payments on credit agreement |  |  | (2,094,500 | ) |  |  | (2,699,000 | ) |  |  | (1,510,000 | )
Proceeds from issuance of senior notes |  |  | 500,000 |  |  |  | — |  |  |  | — |
Payments for financing costs |  |  | (7,090 | ) |  |  | (3,525 | ) |  |  | — |
Payments of contingent consideration liabilities |  |  | (5,263 | ) |  |  | (5,449 | ) |  |  | (10,740 | )
Payments on capital lease obligations |  |  | (1,356 | ) |  |  | (2,267 | ) |  |  | (2,130 | )
Excess tax benefit from exercises of stock options and vesting of restricted stock |  |  | — |  |  |  | — |  |  |  | 4,241 |
Proceeds from issuance of common stock |  |  | 16,258 |  |  |  | 23,276 |  |  |  | 22,022 |
Contribution from noncontrolling interests |  |  | — |  |  |  | 894 |  |  |  | — |
Repurchases of common stock |  |  | (302,160 | ) |  |  | (70,192 | ) |  |  | (61,828 | )
Net cash (used in) provided from financing activities |  |  | (170,611 | ) |  |  | 89,737 |  |  |  | 381,565 |
Net (decrease) increase in cash and cash equivalents |  |  | (23,455 | ) |  |  | 24,502 |  |  |  | 4,126 |
Cash, cash equivalents and restricted cash at beginning of year |  |  | 80,200 |  |  |  | 55,698 |  |  |  | 51,572 |
Cash, cash equivalents and restricted cash at end of year |  | $ | 56,745 |  |  | $ | 80,200 |  |  | $ | 55,698 |
Supplemental disclosure of cash flow information: |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for: |  |  |  |  |  |  |  |  |  |  |  |
Interest |  | $ | 82,540 |  |  | $ | 73,837 |  |  | $ | 60,453 |
Income taxes |  | $ | 185,416 |  |  | $ | 75,427 |  |  | $ | 175,962 |
Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |  |
Value of common stock issued for acquisitions |  | $ | — |  |  | $ | 2,657 |  |  | $ | — |
Equipment financed through capital leases |  | $ | — |  |  | $ | 684 |  |  | $ | 1,619 |
Property and equipment included in accounts payable |  | $ | 2,927 |  |  | $ | 2,700 |  |  | $ | 2,673 |

The accompanying notes are an integral part of these Consolidated Financial Statements.

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MEDNAX, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. General:

The principal business activity of MEDNAX, Inc. (“MEDNAX” or the “Company”) and its subsidiaries is to provide neonatal, anesthesia, radiology and teleradiology, maternal-fetal and other pediatric subspecialty physician services. The Company has contracts with affiliated business corporations or professional associations, limited liability companies and partnerships (“affiliated professional contractors”), which are separate legal entities that provide physician services in certain states and Puerto Rico. The Company and its affiliated professional contractors also have contracts with hospitals and other healthcare facilities to provide physician services, which include (i) fee-for-service contracts, whereby hospitals and other customers agree, in exchange for the Company’s services, to authorize the Company and its healthcare professionals to bill and collect the charges for medical services rendered by the Company’s affiliated healthcare professionals, and (ii) administrative fee contracts, whereby the Company is assured a minimum revenue level.

In addition to its national physician network, the Company also provides services nationwide to healthcare providers, including its own, through complementary businesses including a management services organization specializing in full-service revenue cycle management and a consulting services company.

2. Summary | of Significant Accounting Policies:

Principles of Presentation

The consolidated financial statements include all the accounts of the Company and its subsidiaries combined with the accounts of the affiliated professional contractors with which the Company currently has specific management arrangements. The Company’s agreements with affiliated professional contractors provide that the term of the arrangements are in most cases permanent, subject only to termination by the Company, except in the case of gross negligence, fraud or bankruptcy of the Company. The Company has the right to receive income, both as ongoing fees and as proceeds from the sale of its interest in the Company’s affiliated professional contractors, in an amount that fluctuates based on the performance of the affiliated professional contractors and the change in the fair value of the Company’s interest in the affiliated professional contractors. The Company has exclusive responsibility for the provision of all non-medical services required for the day-to-day operation and management of the Company’s affiliated professional contractors and establishes the guidelines for the employment and compensation of the physicians. In addition, the agreements provide that the Company has the right, but not the obligation, to purchase, or to designate a person(s) to purchase, the stock of the Company’s affiliated professional contractors for a nominal amount. Separately, in its sole discretion, the Company has the right to assign its interest in the agreements. Based upon the provisions of these agreements, the Company has determined that the affiliated professional contractors are variable interest entities and that the Company is the primary beneficiary as defined in the accounting guidance for consolidation. All significant intercompany and interaffiliate accounts and transactions have been eliminated.

The Company is a party to a joint venture in which it owns a 37.5% economic interest. In January 2018, the Company entered into an additional joint venture in which it owns a 49.0% economic interest. The Company accounts for these joint ventures under the equity method of accounting because the Company exercises significant influence over, but does not control, these entities.

Recently Adopted Accounting Pronouncements

In May 2014, the accounting guidance related to revenue recognition was amended to outline a single, comprehensive model for accounting for revenue from contracts with customers. The core principle of the new accounting guidance is to require an entity to recognize as revenue the amount that reflects the consideration to

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which it expects to be entitled in exchange for goods or services as it transfers control to its customers. The guidance became effective for the Company on January 1, 2018 and was adopted on a full retrospective basis. The primary change for healthcare providers under the new guidance is the requirement to report the allowance for uncollectibles associated with patient responsibility amounts as a reduction in net revenue as opposed to bad debt expense, a component of operating expenses. The Company has historically included the allowance for uncollectibles associated with patient responsibility amounts with its allowance for contractual adjustments as a reduction in net revenue as such amounts are not material. Accordingly, the adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements, other than increased financial statement disclosures. The guidance requires increased disclosures, including qualitative and quantitative disclosures about the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers.

New Accounting Pronouncements

In February 2016, the accounting guidance related to leases was issued that will require an entity to recognize leased assets and the rights and obligations created by those leased assets on the balance sheet and to disclose key information about the entity’s leasing arrangements. This guidance became effective for the Company on January 1, 2019, with early adoption permitted. The Company expects that the adoption of this guidance will have a material impact on its Consolidated Balance Sheets and related disclosures, resulting from the recognition of significant right of use assets and related liabilities primarily related to its operating lease arrangements for space in hospitals and certain other facilities for its business and medical offices. The Company has completed the review of its existing lease portfolio and has accumulated all of the necessary information required to properly account for leases under the new guidance. The Company has implemented a cloud-based software application, inclusive of a lease administration module and an accounting module. The Company is in the process of finalizing workflows, business processes and internal controls surrounding the new lease accounting process in order to meet the reporting and disclosure requirements.

Accounting Estimates and Assumptions

The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“GAAP”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods. Significant estimates and assumptions are involved in the calculation of the Company’s allowance for contractual adjustments and uncollectibles on accounts receivable, liabilities for self-insured amounts and claims incurred but not reported related to the Company’s professional liability risks and the fair value of goodwill. Actual results could differ from those estimates.

Segment Reporting

The results of the Company’s operations are aggregated into a single reportable segment for purposes of presenting financial information in accordance with the accounting guidance for segment reporting.

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The following table summarizes the Company’s net revenue by service line (in percentages):

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Neonatology and other pediatric subspecialties |  |  | 36 | % |  |  | 37 | % |  |  | 39 | %
Anesthesiology |  |  | 35 | % |  |  | 38 | % |  |  | 39 | %
Radiology |  |  | 12 | % |  |  | 8 | % |  |  | 6 | %
Maternal-fetal medicine |  |  | 8 | % |  |  | 8 | % |  |  | 8 | %
Management services |  |  | 6 | % |  |  | 6 | % |  |  | 5 | %
Pediatric cardiology |  |  | 3 | % |  |  | 3 | % |  |  | 3 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %

Revenue Recognition

Patient service revenue is recognized at the time services are provided by the Company’s affiliated physicians. The Company’s performance obligations related to the delivery of services to patients are satisfied at the time of service. Accordingly, there are no performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period with respect to patient service revenue. Almost all of the Company’s patient service revenue is reimbursed by GHC Programs and third-party insurance payors. Payments for services rendered to the Company’s patients are generally less than billed charges. The Company monitors its revenue and receivables from these sources and records an estimated contractual allowance to properly account for the anticipated differences between billed and reimbursed amounts.

Accordingly, patient service revenue is presented net of an estimated provision for contractual adjustments and uncollectibles. The Company estimates allowances for contractual adjustments and uncollectibles on accounts receivable based upon historical experience and other factors, including days sales outstanding (“DSO”) for accounts receivable, evaluation of expected adjustments and delinquency rates, past adjustments and collection experience in relation to amounts billed, an aging of accounts receivable, current contract and reimbursement terms, changes in payor mix and other relevant information. Contractual adjustments result from the difference between the physician rates for services performed and the reimbursements by GHC Programs and third-party insurance payors for such services.

Collection of patient service revenue the Company expects to receive is normally a function of providing complete and correct billing information to the GHC Programs and third-party insurance payors within the various filing deadlines and typically occurs within 30 to 60 days of billing.

Some of the Company’s hospital agreements require hospitals to pay the Company administrative fees. Some agreements provide for fees if the hospital does not generate sufficient patient volume in order to guarantee that the Company receives a specified minimum revenue level. The Company also receives fees from hospitals for administrative services performed by its affiliated physicians providing medical director or other services at the hospital.

In addition, the Company generates revenue through its management services organization for services rendered under various coding and billing contracts. Contract terms are specific to each customer and may include a combination of a flat fee for coding of medical charts, a fixed fee per patient visit as well as a percentage of cash collections received by the providers. Revenue for flat and fixed fee arrangements is recognized in the month the coding occurs or the patient visit occurs. Revenue for percentage fees are recognized in the month that cash is collected for customers from payors.

Accounts receivable are primarily amounts due under fee-for-service contracts from third-party payors, such as insurance companies, self-insured employers and patients and GHC Programs geographically dispersed

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throughout the United States and its territories. Concentration of credit risk relating to accounts receivable is limited by the number, diversity and geographic dispersion of the business units managed by the Company, as well as by the large number of patients and payors, including the various governmental agencies in the states in which the Company provides services. Receivables from government agencies made up approximately 19% and 17% of net accounts receivable at December 31, 2018 and 2017, respectively.

Cash and Cash Equivalents

Cash equivalents are defined as all highly liquid financial instruments with maturities of 90 days or less from the date of purchase. The Company’s cash equivalents typically consist of demand deposits, amounts on deposit in money market accounts, and funds invested in overnight repurchase agreements. Cash equivalent balances may, at certain times, exceed federally insured limits.

Certain cash equivalents carried by the Company are subject to the fair value provisions of the accounting guidance for fair value measurements. See “Fair Value Measurements” below.

Restricted Cash

Restricted cash consists of funds in escrow related to a potential future payment for contingent consideration for an acquisition completed in 2017.

Investments

Investments consist of municipal debt securities, federal home loan securities and certificates of deposit. Investments with remaining maturities of less than one year are classified as short-term investments. Investments classified as long-term have maturities of one year to five years.

The Company intends and has the ability to hold its securities to maturity, and therefore carries such investments at amortized cost in accordance with the provisions of the accounting guidance for investments in debt securities.

Property and Equipment

Property and equipment are recorded at original purchase cost. Depreciation of property and equipment is computed using the straight-line method over the estimated useful lives of the underlying assets. Estimated useful lives are generally 30 years for buildings; three to seven years for medical equipment, computer equipment, software and furniture; and the lesser of the useful life or the remaining lease term for leasehold improvements and capital leases. Upon sale or retirement of property and equipment, the related cost and accumulated depreciation are eliminated from the respective accounts and any resulting gain or loss is included in earnings.

Business Acquisitions

The Company accounts for all business acquisitions at fair value and expenses acquisition costs as they are incurred. Any identifiable assets acquired and liabilities assumed are recognized and measured at their respective fair values on the acquisition date. If information about facts and circumstances existing as of the acquisition date is incomplete at the end of the reporting period in which a business acquisition occurs, the Company will report provisional amounts for the items for which the accounting is incomplete. The measurement period ends once the Company receives sufficient information to finalize the fair values; however, the period will not exceed one year from the acquisition date. Any adjustments to provisional amounts that are identified during the measurement period are recognized in the reporting period in which the adjustment amounts are determined.

In connection with certain acquisitions, the Company enters into agreements to pay additional amounts in cash or common stock based on the achievement of certain performance measures for up to five years ending

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after the acquisition dates. The Company measures this contingent consideration at fair value at the acquisition date and records such contingent consideration as a liability or equity on the Company’s Consolidated Balance Sheets on the acquisition date. The fair value of each contingent consideration liability is remeasured at each reporting period with any change in fair value recognized as income or expense within operations in the Company’s Consolidated Statements of Income. See Note 6 for more information on the Company’s business acquisitions.

Goodwill and Other Intangible Assets

The Company records acquired assets and assumed liabilities at their respective fair values under the acquisition method of accounting. Goodwill represents the excess of purchase price over the fair value of the net assets acquired. Intangible assets with finite lives, principally physician and hospital agreements, customer relationships, patented technology and trade names, are recognized apart from goodwill at the time of acquisition based on the contractual-legal and separability criteria established in the accounting guidance. Intangible assets with finite lives are amortized on either an accelerated basis based on the annual undiscounted economic cash flows associated with the particular intangible asset or on a straight-line basis over their estimated useful lives. Intangible assets with finite lives are amortized over periods of one to 20 years.

Goodwill is tested for impairment at a reporting unit level on at least an annual basis in accordance with the subsequent measurement provisions of the accounting guidance for goodwill. The Company defines a reporting unit based upon its management structure for services provided in specific regions of the United States. The Company early adopted new accounting guidance in 2017 that requires only a single-step quantitative test with any goodwill impairment measured as the amount by which a reporting unit’s carrying value exceeds its fair value. The Company uses income and market-based valuation approaches to determine the fair value of its reporting units. These approaches focus on discounted cash flows and market multiples based on the Company’s market capitalization to derive the fair value of a reporting unit. The Company also considers the economic outlook for the healthcare services industry and various other factors during the testing process, including hospital and physician contract changes, local market developments, changes in third-party payor payments, and other publicly available information. The Company completed annual impairment tests in the third quarter of each of 2018, 2017 and 2016 and determined that goodwill was not impaired in any of the three years.

Long-Lived Assets

The Company is required to evaluate long-lived assets, including intangible assets subject to amortization, whenever events or changes in circumstances indicate that the carrying value of the assets may not be fully recoverable. The recoverability of such assets is measured by a comparison of the carrying value of the assets to the future undiscounted cash flows before interest charges to be generated by the assets. If long-lived assets are impaired, the impairment to be recognized is measured as the excess of the carrying value over the fair value. Long-lived assets held for disposal are reported at the lower of the carrying value or fair value less disposal costs. The Company does not believe there are any indicators that would require an adjustment to such assets or their estimated periods of recovery at December 31, 2018 pursuant to current accounting standards.

Common Stock Repurchases

The Company repurchases shares of its common stock as authorized from time to time by its Board of Directors. The Company treats repurchased shares of its common stock as retired as any repurchased shares become authorized but unissued shares. The reacquisition cost of repurchased shares is recorded as a reduction in the respective components of shareholders’ equity.

Professional Liability Coverage

The Company maintains professional liability insurance policies with third-party insurers generally on a claims-made basis, subject to deductibles or self-insured retention, exclusions and other restrictions. The

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Company’s self-insured retention under its professional liability insurance program is maintained primarily through a wholly owned captive insurance subsidiary. The Company records an estimate of liabilities for self-insured amounts and claims incurred but not reported based on an actuarial valuation using historical loss information, claim emergence patterns and various actuarial assumptions. Liabilities for claims incurred but not reported are not discounted.

Income Taxes

The Company records deferred income taxes using the liability method, whereby deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. If it is more likely than not that all or a portion of deferred tax assets will not be realized, a valuation allowance is provided against such deferred tax assets. In making such determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations.

The accounting guidance for uncertain tax positions prescribes a recognition threshold and measurement attribute for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The guidance also requires policy disclosures regarding penalties and interest and extensive disclosures regarding increases and decreases in uncertain tax positions as a result of tax positions taken in a current or prior period, settlements with taxing authorities and any lapse of an applicable statute of limitations. Additional qualitative discussion is required for any tax position that may result in a significant increase or decrease in uncertain tax positions within a 12-month period from the Company’s reporting date.

Stock Incentive Plans

The Company grants stock-based awards consisting primarily of restricted stock to key employees under its Amended and Restated 2008 Incentive Compensation Plan, as amended. The Company measures the cost of employee services received in exchange for stock-based awards based on grant-date fair value and allocates the resulting compensation expense over the corresponding requisite service period using the graded vesting attribution method. The Company also performs analyses to estimate forfeitures of stock-based awards on an annual basis and adjusts the estimates as necessary based on the number of awards that ultimately vest.

Net Income Per Common Share

Basic net income per common share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted net income per common share is calculated by dividing net income by the weighted average number of common and potential common shares outstanding during the period. Potential common shares consist of outstanding restricted stock, deferred stock and stock options and is calculated using the treasury stock method. On January 1, 2017, the Company adopted new accounting guidance that no longer permits the Company to include the assumed excess tax benefits related to the potential exercise or vesting of its stock-based awards in the treasury stock method computation.

Fair Value Measurements

In accordance with the accounting guidance for fair value measurements and disclosures, the Company carries its money market funds included in cash and cash equivalents at fair value. In accordance with the three-tier fair value hierarchy under this guidance, the Company determined the fair value using quoted market prices, a Level 1 input as defined under the accounting guidance for fair value measurements. At December 31, 2018 and 2017, the Company’s money market funds had a fair value of $0.5 million and $9.2 million, respectively.

The Company also carries the cash surrender value of life insurance related to its deferred compensation arrangements at fair value. The investments underlying the life insurance contracts consist primarily of

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exchange-traded equity securities and mutual funds with quoted prices in active markets. In accordance with the three-tier fair value hierarchy, the Company determined the fair value using the cash surrender value of the life insurance, a Level 2 input as defined under the accounting guidance for fair value measurements. At December 31, 2018 and 2017, the Company’s cash surrender value of life insurance had a fair value of $10.5 million and $15.6 million, respectively.

In addition, the Company carries its contingent consideration liabilities related to acquisitions at fair value. In accordance with the three-tier fair value hierarchy, the Company determined the fair value of its contingent consideration liabilities using the income approach with assumed discount rates and payment probabilities. The income approach uses Level 3, or unobservable inputs as defined under the accounting guidance for fair value measurements. At December 31, 2018 and 2017, the Company’s contingent consideration liabilities had a fair value of $20.0 million and $30.5 million, respectively. See Note 6 for more information regarding the Company’s contingent consideration liabilities.

The carrying amounts of cash equivalents, short-term investments, accounts receivable and accounts payable and accrued expenses approximate fair value due to the short maturities of the respective instruments. The carrying values of long-term investments, line of credit, variable rate long-term debt and capital lease obligations approximate fair value. If the Company’s investments were measured at fair value, they would be categorized as Level 2 in the fair value hierarchy. If the Company’s line of credit was measured at fair value, it would be categorized as Level 2 in the fair value hierarchy. See Note 10 for information regarding the fair value of the Company’s 5.25% senior unsecured notes due 2023 (the “2023 Notes”) and 6.25% senior unsecured notes due 2027 (the “2027 Notes”).

3. Investments:

Investments held are summarized as follows (in thousands):

|  | December 31, 2018 |  |  | December 31, 2017 |
|  | Short-Term |  |  | Long-Term |  |  | Short-Term |  |  | Long-Term |
Municipal debt securities |  | $ | 18,473 |  |  | $ | 30,841 |  |  | $ | 8,312 |  |  | $ | 46,195 |
Federal home loan securities |  |  | 2,000 |  |  |  | 34,393 |  |  |  | 1,000 |  |  |  | 30,322 |
Certificates of deposit |  |  | 1,450 |  |  |  | 4,465 |  |  |  | 980 |  |  |  | 4,165 |
|  | $ | 21,923 |  |  | $ | 69,699 |  |  | $ | 10,292 |  |  | $ | 80,682 |

Contractual maturities of long-term investments are summarized as follows (in thousands):

|  | December 31, |
|  | 2018 |  |  | 2017 |
Due after one year through five years |  | $ | 69,699 |  |  | $ | 78,561 |
Due after five years through six years |  |  | — |  |  |  | 2,121 |
|  | $ | 69,699 |  |  | $ | 80,682 |

4. Accounts Receivable and Net Revenue:

Accounts receivable, net consists of the following (in thousands):

|  | December 31, |
|  | 2018 |  |  | 2017 |
Gross accounts receivable |  | $ | 2,031,341 |  |  | $ | 1,790,034 |
Allowance for contractual adjustments and uncollectibles |  |  | (1,489,069 | ) |  |  | (1,286,035 | )
|  | $ | 542,272 |  |  | $ | 503,999 |

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Net revenue consists of the following (in thousands):

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Net patient service revenue |  | $ | 3,067,784 |  |  | $ | 2,915,648 |  |  | $ | 2,760,192 |
Hospital contract administrative fees |  |  | 363,369 |  |  |  | 315,778 |  |  |  | 271,886 |
Management services and other |  |  | 215,970 |  |  |  | 226,886 |  |  |  | 151,081 |
|  | $ | 3,647,123 |  |  | $ | 3,458,312 |  |  | $ | 3,183,159 |

The following is a summary of our payor mix, expressed as a percentage of net revenue, exclusive of administrative fees and revenue related to management services and other, for the periods indicated:

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Contracted managed care |  |  | 70 | % |  |  | 70 | % |  |  | 70 | %
Government |  |  | 24 | % |  |  | 25 | % |  |  | 23 | %
Other third-parties |  |  | 4 | % |  |  | 4 | % |  |  | 6 | %
Private-pay patients |  |  | 2 | % |  |  | 1 | % |  |  | 1 | %
|  |  | 100 | % |  |  | 100 | % |  |  | 100 | %

Accounts receivable of $542.3 million and $504.0 million at December 31, 2018 and 2017, respectively, consist primarily of amounts due from GHC Programs and third-party insurance payors for services provided by the Company’s affiliated physicians.

Net revenue of $3.6 billion, $3.5 billion and $3.2 billion for the years ended December 31, 2018, 2017 and 2016, respectively, consists primarily of gross billed charges for services provided by the Company’s affiliated physicians less an estimated allowance for contractual adjustments and uncollectibles to properly account for the anticipated differences between gross billed charge amounts and expected reimbursement amounts.

The Company’s contractual adjustments and uncollectibles as a percentage of gross patient service revenue vary slightly each year depending on several factors, including improved managed care contracting, changes in reimbursement from state Medicaid programs and other GHC Programs, shifts in the percentage of patient services being reimbursed under GHC Programs and annual price increases.

The Company’s annual price increases typically increase contractual adjustments as a percentage of gross patient service revenue. This increase is primarily due to Medicaid, Medicare and other GHC Programs that generally provide for reimbursements on a fee-schedule basis rather than on a gross charge basis. When the Company bills these programs, like other payors, on a gross-charge basis, it also increases its provision for contractual adjustments and uncollectibles by the amount of any price increase, resulting in a higher contractual adjustment percentage.

Some of the Company’s hospital agreements require hospitals to pay the Company administrative fees. Some agreements provide for fees if the hospital does not generate sufficient patient volume in order to guarantee that the Company receives a specified minimum revenue level. The Company also receives fees from hospitals for administrative services performed by its affiliated physicians providing medical director or other services at the hospital.

In addition, the Company generates revenue through its management services organization for services rendered under various coding and billing contracts. Contract terms are specific to each customer and may include a combination of a flat fee for coding of medical charts, a fixed fee per patient visit as well as a

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percentage of cash collections received by the providers. Revenue for flat and fixed fee arrangements is recognized in the month the coding occurs or the patient visit occurs. Revenue for percentage fees are recognized in the month that cash is collected for customers from payors.

5. Property and Equipment:

Property and equipment consists of the following (in thousands):

|  | December 31, |
|  | 2018 |  |  | 2017 |
Building |  | $ | 33,189 |  |  | $ | 33,024 |
Land |  |  | 6,683 |  |  |  | 6,683 |
Equipment and other |  |  | 300,981 |  |  |  | 253,453 |
|  |  | 340,853 |  |  |  | 293,160 |
Accumulated depreciation |  |  | (207,816 | ) |  |  | (169,624 | )
|  | $ | 133,037 |  |  | $ | 123,536 |

At December 31, 2018 and 2017, property and equipment includes medical and other equipment held under capital leases of $4.8 million and $6.1 million, and related accumulated depreciation of $4.0 million and $4.6 million, respectively. The Company recorded depreciation expense of $38.5 million, $33.9 million and $29.0 million for the years ended December 31, 2018, 2017 and 2016, respectively.

6. Business Acquisitions:

During the year ended December 31, 2018, the Company completed nine physician group practice acquisitions, including five radiology practices, two neonatology practices and two other pediatric subspecialty practices. The acquisition-date fair value of the total consideration for the nine acquisitions was $111.8 million, net of cash acquired. In connection with these acquisitions, the Company recorded goodwill of $95.0 million, other intangible assets consisting primarily of physician and hospital agreements of $17.2 million, current assets of $1.7 million and other liabilities of $2.1 million.

These acquisitions expanded the Company’s national network of physician practices. The Company expects to improve the results of physician practices through improved managed care contracting, improved collections and identification of growth initiatives, as well as operating and cost savings based on the significant infrastructure it has developed. With respect to the Company’s acquisition of radiology physician practices, the Company believes that it brings a unique value proposition to radiology physician groups, in that the Company can provide practice management support and a technology platform enabling radiology to be practiced at a national level, as well as teleradiology capabilities that can enhance a physician group’s efficiency, provide subspecialty access and help them to grow strategically and remain competitive while meeting the demands of their hospital partners, third-party payors and regulatory bodies. In addition, the Company believes that radiology physician group practice physicians can complement the staffing needs for its teleradiology services business during certain times, such as nights and weekends, when such physicians are not providing services at their practices.

During the year ended December 31, 2018, in connection with certain prior-period acquisitions, the Company paid $6.4 million for contingent consideration and $1.2 million for purchase consideration that had been held back pending satisfaction of certain conditions. Of these amounts, all except for the accretion recorded during 2018 were accrued as of December 31, 2017. In addition, the Company recorded a decrease of $5.3 million related to the change in the fair value of a contingent consideration agreement for which the probability of the achievement of certain performance measures was updated. This change in fair value of contingent consideration was recorded within operating expenses.

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In connection with certain prior-period acquisitions, the Company also recorded a net increase in goodwill of $4.0 million composed of a decrease in current assets of $1.2 million, a decrease in noncurrent assets of $1.5 million and a decrease in liabilities of $0.2 million for measurement-period adjustments resulting from the finalization of acquisition accounting as well as additional cash consideration of $1.5 million related to a working capital true up.

In January 2018, the Company completed the sale of a controlling interest and the contribution of remaining assets to a joint venture related to the $46.0 million of assets held for sale at December 31, 2017. The Company accounts for its 49.0% economic interest in the joint venture as an equity method investment. The investment in this joint venture is included in other assets as presented in the Company’s Condensed Consolidated Balance Sheet.

On November 1, 2018, the Company announced the initiation of a process to potentially divest the Company’s management services service line to allow the Company to focus the organization on its core physician services business. There can be no assurance that this process will result in a transaction, and the Company may decide to retain all or part of the management services service line. The Company had expected that the management services service line could be classified as assets and liabilities held for sale within the Company’s Consolidated Balance Sheets and that historical operating results of the service line could be reported as discontinued operations in the Company’s Consolidated Statements of Income for the year ended December 31, 2018; however, the criteria for such classification was not met at December 31, 2018. The management services service line continues to be classified as held and used as of December 31, 2018.

During the year ended December 31, 2017, the Company completed 10 physician group practice acquisitions, including four radiology practices, two maternal-fetal medicine practices, one neonatology practice, one pediatric multi-specialty practice and two other pediatric subspecialty practices.

On March 31, 2017, the Company sold its 75% economic interest in a joint venture that was previously consolidated. The deconsolidation and removal of 100% of the carrying value of the joint venture’s net assets resulted in a gain on sale that was not material.

7. Goodwill and Intangible Assets:

Goodwill was $4.4 billion and $4.3 billion at December 31, 2018 and 2017, respectively. The change in the carrying amount of goodwill of $99.0 million during the year ended December 31, 2018 is primarily related to the Company’s 2018 acquisitions. The Company expects that $63.0 million of the goodwill recorded during the year ended December 31, 2018 will be deductible for tax purposes.

The Company’s management services reporting unit has experienced lower operating results than previously forecasted primarily due to a slower rate of new customer bookings and an increase in customer termination activity. The Company continues to believe that the fair value of the reporting unit exceeds the carrying value, and accordingly the goodwill assigned to the management services reporting unit is not impaired. Although the Company believes that the current assumptions and estimates used in its goodwill analysis are reasonable, supportable and appropriate, continued efforts to maintain or improve the performance of this business could be impacted by unfavorable or unforeseen changes which could impact the existing assumptions used in the impairment analysis. Various factors could reasonably be expected to unfavorably impact existing assumptions, primarily delays in new customer bookings and the related delay in revenue from new customers, increases in customer termination activity or increases in operating costs. Accordingly, there can be no assurance that the estimates and assumptions made for the purposes of the goodwill impairment analysis will prove to be accurate predictions of future performance. The carrying value of the Company’s management services reporting unit included goodwill of $321.6 million as of December 31, 2018. The Company will continue to closely monitor the performance of the management services reporting unit. If an impairment loss is required in a future period, it could have a material adverse effect on the Company’s business, financial condition, results of operations, cash flows and the trading price of the Company’s securities.

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Intangible assets, net, consist of the following (in thousands):

|  | December 31, 2018 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |
Physician and hospital agreements |  | $ | 376,871 |  |  | $ | (223,589) |  |  | $ | 153,282 |
Customer relationships |  |  | 443,300 |  |  |  | (71,870 | ) |  |  | 371,430 |
Trade names |  |  | 43,156 |  |  |  | (4,630 | ) |  |  | 38,526 |
Patented and other technology |  |  | 47,561 |  |  |  | (22,487 | ) |  |  | 25,074 |
|  | $ | 910,888 |  |  | $ | (322,576) |  |  | $ | 588,312 |

|  | December 31, 2017 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |
Physician and hospital agreements |  | $ | 381,635 |  |  | $ | (203,915) |  |  | $ | 177,720 |
Customer relationships |  |  | 443,300 |  |  |  | (48,837 | ) |  |  | 394,463 |
Trade names |  |  | 43,156 |  |  |  | (2,933 | ) |  |  | 40,223 |
Patented and other technology |  |  | 38,590 |  |  |  | (11,068 | ) |  |  | 27,522 |
|  | $ | 906,681 |  |  | $ | (266,753) |  |  | $ | 639,928 |

During the year ended December 31, 2018, the Company recorded intangible assets related to acquisitions totaling $17.2 million, consisting primarily of physician and hospital agreements. The weighted-average amortization period for these physician and hospital agreements is approximately nine years.

Amortization expense for intangible assets was $72.8 million, $68.9 million and $60.3 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Amortization expense for existing intangible assets for the next five years is expected to be as follows (in thousands):

2019 |  | $ | 66,532 |
2020 |  |  | 59,969 |
2021 |  |  | 53,771 |
2022 |  |  | 46,249 |
2023 |  |  | 40,448 |

8. Accounts Payable and Accrued Expenses:

Accounts payable and accrued expenses consist of the following (in thousands):

|  | December 31, |
|  | 2018 |  |  | 2017 |
Accounts payable |  | $ | 31,059 |  |  | $ | 34,632 |
Accrued salaries and bonuses |  |  | 249,834 |  |  |  | 225,429 |
Accrued payroll taxes and benefits |  |  | 80,369 |  |  |  | 75,672 |
Accrued professional liabilities |  |  | 34,931 |  |  |  | 37,912 |
Accrued contingent consideration |  |  | 18,760 |  |  |  | 6,259 |
Accrued interest |  |  | 9,477 |  |  |  | 4,495 |
Other accrued expenses |  |  | 44,912 |  |  |  | 53,618 |
|  | $ | 469,342 |  |  | $ | 438,017 |

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9. Accrued Professional Liabilities:

At December 31, 2018 and 2017, the Company’s total accrued professional liabilities of $244.0 million and $250.2 million, respectively, included incurred but not reported loss reserves of $139.1 million and $138.5 million, respectively, and loss reserves for reported claims of $104.9 million and $111.7 million, respectively. Of the total liability, $34.9 million is classified as a current liability within accounts payable and accrued expenses in the Consolidated Balance Sheet. In addition, there is a corresponding insurance receivable of $16.7 million recorded as a component of other assets for certain professional liability claims that are covered by third-party insurance policies.

The activity related to the Company’s total accrued professional liability for the years ended December 31, 2018, 2017 and 2016 is as follows (in thousands):

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Balance at beginning of year |  | $ | 250,187 |  |  | $ | 202,052 |  |  | $ | 202,527 |
Assumed liabilities through acquisition |  |  | 1,276 |  |  |  | 20,716 |  |  |  | — |
Provision (adjustment) for losses related to: |  |  |  |  |  |  |  |  |  |  |  |
Current year |  |  | 34,483 |  |  |  | 41,291 |  |  |  | 38,129 |
Prior years |  |  | 10,299 |  |  |  | 9,983 |  |  |  | (25,428 | )
Total provision for losses |  |  | 44,782 |  |  |  | 51,274 |  |  |  | 12,701 |
Claim payments related to: |  |  |  |  |  |  |  |  |  |  |  |
Current year |  |  | (555 | ) |  |  | (712 | ) |  |  | (766 | )
Prior years |  |  | (51,699 | ) |  |  | (23,143 | ) |  |  | (12,410 | )
Total payments |  |  | (52,254 | ) |  |  | (23,855 | ) |  |  | (13,176 | )
Balance at end of year |  | $ | 243,991 |  |  | $ | 250,187 |  |  | $ | 202,052 |

The net decrease in the Company’s total accrued professional liability for the year ended December 31, 2018 was primarily related to an increase in claims payments made in the current year, partially offset by overall unfavorable trends in the Company’s claims experience that impacted its provision for losses. The net increase in the Company’s total accrued professional liability for the year ended December 31, 2017 was primarily related to overall unfavorable trends in the Company’s claims experience that impacted its provision for losses and growth in the program from acquisitions.

10. Line of Credit, Long-Term Debt and Capital Lease Obligations:

The Company’s Credit Agreement provides for a $2.0 billion unsecured revolving credit facility and includes a $37.5 million sub-facility for the issuance of letters of credit. In November 2018, the Company amended and restated its Credit Agreement to make certain technical, conforming and other changes. The Credit Agreement matures on October 31, 2022 and is guaranteed by substantially all of the Company’s subsidiaries and affiliated professional associations and corporations. At the Company’s option, borrowings under the Credit Agreement will bear interest at (i) the alternate base rate (defined as the higher of (a) the prime rate, (b) the Federal Funds Rate plus 1/2 of 1.00% and (c) LIBOR for an interest period of one month plus 1.00%) plus an applicable margin rate ranging from 0.125% to 0.750% based on the Company’s consolidated leverage ratio or (ii) the LIBOR rate plus an applicable margin rate ranging from 1.125% to 1.750% based on the Company’s consolidated leverage ratio. The Credit Agreement also calls for other customary fees and charges, including an unused commitment fee ranging from 0.150% to 0.300% of the unused lending commitments, based on the Company’s consolidated leverage ratio.

The Credit Agreement contains customary covenants and restrictions, including covenants that require the Company to maintain a minimum interest charge ratio, not to exceed a specified consolidated leverage ratio and

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to comply with laws, and restrictions on the ability of the Company to pay dividends and make certain other distributions, as specified therein. Failure to comply with these covenants would constitute an event of default under the Credit Agreement, notwithstanding the ability of the Company to meet its debt service obligations. The Credit Agreement also includes various customary remedies for the lenders following an event of default, including the acceleration of repayment of outstanding amounts under the Credit Agreement.

In December 2015, the Company completed a private offering of $750.0 million aggregate principal amount of 2023 Notes. In November 2018, the Company completed a private offering of $500.0 million aggregate principal amount of 2027 Notes. The Company’s obligations under the 2023 Notes and the 2027 Notes are guaranteed on an unsecured senior basis by the same subsidiaries and affiliated professional contractors that guarantee the Credit Agreement. Interest on the 2023 Notes accrues at the rate of 5.25% per annum and is payable semi-annually in arrears on June 1 and December 1. Interest on the 2027 Notes accrues at the rate of 6.25% per annum and is payable semi-annually in arrears on January 15 and July 15, with the initial interest payment due on January 15, 2019.

As of December 31, 2018, the Company may redeem all or a portion of the 2023 Notes, at the redemption prices of 102.625% in 2019, 101.313% in 2020 and 100% in 2021 and thereafter, plus accrued and unpaid interest to the redemption date.

At any time prior to January 15, 2022, the Company may redeem all or a portion of the 2027 Notes at a redemption price equal to 100% of the principal amount of the notes being redeemed plus an applicable redemption premium and accrued and unpaid interest to the redemption date. In addition, at any time prior to January 15, 2022, the Company may redeem up to 35% of the aggregate principal amount of the 2027 Notes at a redemption price of 106.250% of the principal amount thereof, plus accrued and unpaid interest, if any, to the redemption date, using proceeds from one or more equity offerings. On or after January 15, 2022, the Company may redeem all or a portion of the 2027 Notes, at the redemption prices of 104.688% in 2022, 103.125% in 2023, 101.563% in 2024 and 100% in 2025 and thereafter, plus accrued and unpaid interest to the redemption date.

The indenture under which the 2023 Notes and the 2027 Notes are issued, among other things, limits our ability to (1) incur liens and (2) enter into sale and lease-back transactions, and also limits our ability to merge or dispose of all or substantially all of our assets, in all cases, subject to a number of customary exceptions. Although we are not required to make mandatory redemption or sinking fund payments with respect to the 2023 Notes or the 2027 Notes, upon the occurrence of a change in control of MEDNAX, we may be required to repurchase the 2023 Notes or the 2027 Notes at a purchase price equal to 101% of the aggregate principal amount of the 2023 Notes and the 2027 Notes repurchased plus accrued and unpaid interest.

The carrying value of the Company’s long-term debt was $2.0 billion and $1.8 billion at December 31, 2018 and 2017, respectively, and consisted of the following (in thousands):

|  | December 31, 2018 |
|  | Principal |  |  | Unamortized Debt Issuance Costs |  |  | Total |
Senior Notes |  | $ | 1,250,000 |  |  | $ | (15,408 | ) |  | $ | 1,234,592 |
Revolving line of credit |  |  | 739,500 |  |  |  | (4,274 | ) |  |  | 735,226 |
Total |  | $ | 1,989,500 |  |  | $ | (19,682 | ) |  | $ | 1,969,818 |

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|  | December 31, 2017 |
|  | Principal |  |  | Unamortized Debt Issuance Costs |  |  | Total |
Senior Notes |  | $ | 750,000 |  |  | $ | (9,503 | ) |  | $ | 740,497 |
Revolving line of credit |  |  | 1,110,500 |  |  |  | (4,864 | ) |  |  | 1,105,636 |
Total |  | $ | 1,860,500 |  |  | $ | (14,367 | ) |  | $ | 1,846,133 |

The Company presents issuance costs related to long-term debt liabilities, other than revolving credit arrangements, as a direct deduction from the carrying value of that long-term debt. The Company has outstanding letters of credit which reduced the amount available under the Credit Agreement by $0.2 million at December 31, 2018. At December 31, 2018, the Company had an available balance on its Credit Agreement of $1.3 billion.

The carrying values of the Company’s variable rate revolving line of credit approximates fair value due to the short-term nature of the interest rates. The estimated fair value of the Company’s 2023 Notes and 2027 Notes were estimated using trading prices as of December 31, 2018 and 2017, respectively, as Level 2 inputs to estimate fair value and are summarized as follows (in thousands):

|  | December 31, |
|  | 2018 |  |  | 2017 |
2023 Notes |  | $ | 736,725 |  |  | $ | 763,125 |
2027 Notes |  |  | 482,500 |  |  |  | — |

The Company’s capital lease obligations consist of the following (in thousands):

|  | December 31, |
|  | 2018 |  |  | 2017 |
Capital lease obligations |  | $ | 441 |  |  | $ | 1,826 |
Less: Current portion |  |  | (253 | ) |  |  | (1,401 | )
Long-term portion |  | $ | 188 |  |  | $ | 425 |

The amounts due under the terms of the Company’s capital lease obligations at December 31, 2018 are as follows:

2019 |  | $ | 253 |
2020 |  |  | 114 |
2021 |  |  | 74 |

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11. Income Taxes:

The components of the income tax provision (benefit) are as follows (in thousands):

|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Federal: |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | 97,754 |  |  | $ | 130,053 |  |  | $ | 166,758 |
Deferred |  |  | (20,176 | ) |  |  | (63,038 | ) |  |  | 15,596 |
|  |  | 77,578 |  |  |  | 67,015 |  |  |  | 182,354 |
State: |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 26,605 |  |  |  | 20,070 |  |  |  | 4,296 |
Deferred |  |  | (3,973 | ) |  |  | 2,965 |  |  |  | 2,553 |
|  |  | 22,632 |  |  |  | 23,035 |  |  |  | 6,849 |
Total |  | $ | 100,210 |  |  | $ | 90,050 |  |  | $ | 189,203 |

The Company files its tax return on a consolidated basis with its subsidiaries, and its affiliated professional contractors file tax returns on an individual basis.

Beginning on January 1, 2018, the Company’s statutory tax rate was reduced from 35.0% to 21.0% as a result of legislation enacted under the Tax Cuts and Jobs Act of 2017 (“TCJA”). The effective tax rate was 27.2%, 21.9% and 36.8% for the years ended December 31, 2018, 2017 and 2016, respectively. During the three months ended December 31, 2017, the Company recorded a $70.0 million income tax benefit related to the reduction of its net deferred tax liability resulting from the reduction in the corporate tax rate under the TCJA. During the three months ended September 30, 2016, the Company settled a certain tax matter with a taxing authority. In connection with this settlement, the Company’s effective income tax rate was favorably impacted by $10.6 million.

The differences between the effective rate and the United States federal income tax statutory rate are as follows:

|  | December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Tax at statutory rate |  |  | 21.00 | % |  |  | 35.00 | % |  |  | 35.00 | %
State income tax, net of federal benefit |  |  | 4.80 |  |  |  | 3.33 |  |  |  | 2.94 |
Non-deductible expenses |  |  | 0.44 |  |  |  | 0.49 |  |  |  | 0.43 |
Change in accrual estimates relating to uncertain tax positions |  |  | 0.05 |  |  |  | 0.02 |  |  |  | (2.11 | )
Change in valuation allowance |  |  | — |  |  |  | — |  |  |  | 0.48 |
Other, net |  |  | 1.20 |  |  |  | 0.16 |  |  |  | 0.06 |
Change in tax law |  |  | (0.32 | ) |  |  | (17.06 | ) |  |  | — |
Income tax provision |  |  | 27.17 | % |  |  | 21.94 | % |  |  | 36.80 | %

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All of the Company’s deferred tax assets and liabilities are classified as long-term. The significant components of deferred income tax assets and liabilities are as follows (in thousands):

|  | December 31, |
|  | 2018 |  |  | 2017 |
Allowance for uncollectible accounts |  | $ | 194,876 |  |  | $ | 80,056 |
Reserves and accruals |  |  | 59,270 |  |  |  | 45,454 |
Stock-based compensation |  |  | 9,201 |  |  |  | 7,975 |
Net operating loss carryforward |  |  | 25,226 |  |  |  | 28,569 |
Property and equipment |  |  | 26 |  |  |  | 685 |
Other |  |  | 1,197 |  |  |  | 970 |
Deferred tax assets before valuation allowance |  |  | 289,796 |  |  |  | 163,709 |
Less: Valuation allowance |  |  | (2,628 | ) |  |  | (2,615 | )
Deferred tax assets, net of valuation allowance |  |  | 287,168 |  |  |  | 161,094 |
Gross deferred tax liabilities: |  |  |  |  |  |  |  |
Amortization |  |  | (286,552 | ) |  |  | (258,618 | )
Accounting method changes |  |  | (109,418 | ) |  |  | (4,150 | )
Accrual to cash adjustment |  |  | (39 | ) |  |  | (31,290 | )
Other |  |  | (489 | ) |  |  | — |
Total deferred tax liabilities |  |  | (396,498 | ) |  |  | (294,058 | )
Net deferred tax liability |  | $ | (109,330 | ) |  | $ | (132,964 | )

The Company’s net deferred tax liability decreased by $23.6 million during 2018. During 2018, certain of the Company’s affiliated professional contractors elected to change their method of accounting from cash basis to accrual basis for income tax purposes. During the year ended December 31, 2018, the increases in allowance for uncollectible accounts of $114.8 million and accounting method changes of $105.3 million as well as the decrease in accrual to cash adjustment of $31.3 million primarily relate to these accounting method changes.

Beginning January 1, 2017, excess tax benefits or deficiencies associated with the exercise of stock options, the vesting of restricted and deferred stock and the purchase of shares under the Company’s non-qualified employee stock purchase plan are recognized as income tax benefits or expenses in the income statement in the reporting period in which they occur instead of an increase or decrease to additional paid-in-capital. For the years ended December 31, 2018 and 2017, income tax expense of $1.4 million and $0.2 million, respectively, was recognized for excess tax deficiencies. For the year ended December 31, 2016, additional paid-in-capital was increased by $4.2 million for excess tax benefits.

The Company has net operating loss carryforwards for federal and state tax purposes totaling $101.9 million, $116.0 million and $130.0 million at December 31, 2018, 2017 and 2016, respectively. With respect to the December 31, 2018 balance, approximately $74.3 million expires at various times from 2019 through 2038, and $27.6 million does not expire.

As of December 31, 2018, 2017 and 2016, the Company’s liability for uncertain tax positions, excluding accrued interest and penalties, was $11.2 million, $11.0 million and $9.5 million, respectively. As of December 31, 2018, the Company had $10.9 million of uncertain tax positions that, if recognized, would favorably impact its effective tax rate.

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The following table summarizes the activity related to the Company’s liability for uncertain tax positions for the years ended December 31, 2018, 2017 and 2016 (in thousands):

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Balance at beginning of year |  | $ | 10,972 |  |  | $ | 9,469 |  |  | $ | 18,447 |
Increases related to prior year tax positions |  |  | 385 |  |  |  | 2,284 |  |  |  | 301 |
Decreases related to prior year tax positions |  |  | — |  |  |  | (143 | ) |  |  | (3,927 | )
Increases related to current year tax positions |  |  | 2,900 |  |  |  | 1,430 |  |  |  | 2,258 |
Settlements |  |  | — |  |  |  | — |  |  |  | (5,644 | )
Decreases related to lapse of statutes of limitation |  |  | (3,072 | ) |  |  | (2,068 | ) |  |  | (1,966 | )
Balance at end of year |  | $ | 11,185 |  |  | $ | 10,972 |  |  | $ | 9,469 |

During the years ended December 31, 2018 and 2017, the Company increased its liability for uncertain tax positions by a total of $0.2 million and $1.5 million, respectively, primarily related to additional taxes on current and prior year positions, partially offset by the expiration of statutes of limitation. In addition, the Company anticipates that its liability for uncertain tax positions will increase by $0.2 million over the next 12 months.

The Company includes interest and penalties related to income tax liabilities in income tax expense. The income tax benefit recognized by the Company for interest and penalties during the year ended December 31, 2018 was nominal. The Company recognized income tax benefits of $0.2 million and $7.9 million related to interest and penalties during the years ended December 31, 2017 and 2016, respectively. At December 31, 2018 and 2017, the Company’s accrued liability for interest and penalties related to income tax liabilities totaled $1.1 million and $1.2 million, respectively.

The Company is currently subject to U.S. Federal and various state income tax examinations for the tax years 2014 through 2017.

12. Common and Common Equivalent Shares:

The calculation of shares used in the basic and diluted net income per share calculation for the years ended December 31, 2018, 2017 and 2016 is as follows (in thousands):

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Weighted average number of common shares outstanding |  |  | 91,104 |  |  |  | 92,431 |  |  |  | 92,422 |
Weighted average number of dilutive common share equivalents |  |  | 502 |  |  |  | 527 |  |  |  | 687 |
Weighted average number of common and common equivalent shares outstanding |  |  | 91,606 |  |  |  | 92,958 |  |  |  | 93,109 |
Antidilutive securities not included in the diluted net income per common share calculation |  |  | 214 |  |  |  | 107 |  |  |  | 2 |

13. Stock Incentive Plans and Stock Purchase Plans:

The Company’s Amended and Restated 2008 Incentive Compensation Plan, as amended (the “Amended and Restated 2008 Incentive Plan”) provides for grants of stock options, stock appreciation rights, restricted stock, deferred stock, and other stock-related awards and performance awards that may be settled in cash, stock or other property.

Under the Amended and Restated 2008 Incentive Plan, options to purchase shares of common stock may be granted at a price not less than the fair market value of the shares on the date of grant. The options must be

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exercised within 10 years from the date of grant and generally become exercisable on a pro rata basis over a three-year period from the date of grant. The Company issues new shares of its common stock upon exercise of its stock options. Restricted stock awards generally vest over periods of three years upon the fulfillment of specified service-based conditions and in certain instances performance-based conditions. Deferred stock awards generally vest upon the satisfaction of specified performance-based conditions or service-based conditions. The Company recognizes compensation expense related to its restricted stock and deferred stock awards ratably over the corresponding vesting periods. At December 31, 2018, the Company had 2.0 million shares available for future grants and awards under its Amended and Restated 2008 Incentive Plan.

Under the Company’s 1996 Non-Qualified Employee Stock Purchase Plan, as amended (the “ESPP”), employees are permitted to purchase the Company’s common stock at 85% of market value on January 1st, April 1st, July 1st and October 1st of each year. Under the Company’s 2015 Non-Qualified Stock Purchase Plan (the “SPP”), certain eligible non-employee service providers are permitted to purchase the Company’s common stock at 90% of market value on January 1st, April 1st, July 1st and October 1st of each year.

Each of the ESPP and the SPP provide for the issuance of an of aggregate 2.6 million shares of the Company’s common stock less the number of shares of common stock purchased under the other plan. The Company recognizes stock-based compensation expense for the discount received by participating employees and non-employee service providers. During the year ended December 31, 2018, 0.4 million shares were issued under the ESPP and SPP. At December 31, 2018, the Company had 1.6 million shares in aggregate reserved for issuance under the ESPP and SPP.

The Company recognized $38.7 million, $29.6 million and $34.0 million of stock-based compensation expense related to its stock incentive plans, the ESPP and the SPP during the years ended December 31, 2018, 2017 and 2016, respectively.

The activity related to the Company’s restricted stock and deferred stock awards and the corresponding weighted average grant-date fair values for the year ended December 31, 2018 are as follows:

|  | Number of Shares |  |  | Weighted Average Fair Value |
Non-vested shares at January 1, 2018 |  |  | 1,041,034 |  |  | $ | 60.21 |
Awarded |  |  | 770,480 |  |  | $ | 51.99 |
Forfeited |  |  | (69,293 | ) |  | $ | 56.65 |
Vested |  |  | (431,368 | ) |  | $ | 63.57 |
Non-vested shares at December 31, 2018 |  |  | 1,310,853 |  |  | $ | 54.46 |

The aggregate fair value of the restricted and deferred stock that vested during the years ended December 31, 2018, 2017 and 2016 was $27.4 million, $29.3 million and $29.8 million, respectively.

The weighted average grant-date fair value of restricted and deferred stock awards that were granted during the years ended December 31, 2018, 2017 and 2016 was $51.99, $54.22 and $67.90, respectively.

At December 31, 2018, the total stock-based compensation cost related to non-vested restricted and deferred stock remaining to be recognized as compensation expense over a weighted-average period of 1.4 years was $30.8 million.

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The Company did not grant any stock options in 2018, 2017, or 2016, and all stock-based compensation cost related to stock options has been recognized. The activity and certain other information related to the Company’s outstanding stock option awards for the year ended December 31, 2018 are as follows:

|  | Number of Stock Options |  |  | Weighted Average Exercise Price |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Aggregate Intrinsic Value (in millions) |
Outstanding at January 1, 2018 |  |  | 246,342 |  |  | $ | 27.51 |  |  |  |  |  |  |  |  |
Exercised |  |  | (133,366 | ) |  | $ | 27.38 |  |  |  |  |  |  | $ | 2.8 |
Outstanding and exercisable at December 31, 2018 |  |  | 112,976 |  |  | $ | 27.65 |  |  |  | 1.3 |  |  | $ | 0.7 |

The aggregate intrinsic value of stock options exercised during the years ended December 31, 2018, 2017 and 2016 was $2.8 million, $5.5 million and $6.8 million, respectively.

There were no excess tax benefits recognized in additional paid-in capital in 2018 or 2017 due to the adoption of new accounting guidance on January 1, 2017 that requires excess tax benefits to be recognized in the income statement. The net excess tax benefit recognized in additional paid-in capital related primarily to stock options, restricted stock and deferred stock for the year ended December 31, 2016 was $4.1 million. The cash proceeds received from the exercise of stock options for the years ended December 31, 2018, 2017 and 2016 were $3.7 million, $4.8 million and $4.7 million, respectively.

14. Common Stock Repurchase Programs:

In July 2013, the Company’s Board of Directors authorized the repurchase of shares of the Company’s common stock up to an amount sufficient to offset the dilutive impact from the issuance of shares under the Company’s equity compensation programs. The share repurchase program allows the Company to make open market purchases from time-to-time based on general economic and market conditions and trading restrictions. The repurchase program also allows for the repurchase of shares of the Company’s common stock to offset the dilutive impact from the issuance of shares, if any, related to the Company’s acquisition program. Shares repurchased by the Company during the second quarter of 2018 completed the repurchases under the program with respect to issuances of shares under the Company’s equity compensation programs during 2018.

In August 2018, the Company announced that its Board of Directors had authorized the repurchase of up to $500.0 million of the Company’s common stock in addition to its existing share repurchase program. As part of this repurchase program, on August 31, 2018, the Company entered into an uncollared accelerated share repurchase (“ASR”) agreement with an investment bank. Under the ASR agreement, the Company agreed to purchase $250.0 million of its common stock in total. On September 4, 2018, the Company paid a total of $250.0 million to the investment bank, which in turn delivered to the Company approximately 4.2 million shares of the Company’s common stock in total based on the market price of a share of Company common stock on August 31, 2018. The payment was recorded as a reduction to the respective components of shareholders’ equity. The ASR agreement was funded by borrowings under the Company’s Credit Agreement discussed in Note 10. Final settlement of the ASR occurred in December 2018 with the delivery to the Company of approximately 1.7 million additional shares of common stock. The final number of shares of common stock that the Company received was based upon the average daily volume weighted-average price of the Company’s common stock during the term of the ASR agreement, less a negotiated discount.

Under the share repurchase programs described above, the Company repurchased approximately 7.0 million shares of its common stock for approximately $302.2 million during the year ended December 31, 2018, inclusive of 54,909 shares withheld to satisfy minimum statutory withholding obligations of $2.5 million in connection with the vesting of restricted stock and exercises of stock options during the second quarter of 2018.

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During the year ended December 31, 2017, the Company repurchased 1.0 million shares of its common stock for $70.2 million, inclusive of 38,257 shares withheld to satisfy minimum statutory withholding obligations of $2.1 million in connection with the vesting of restricted stock.

The Company intends to utilize various methods to effect any future share repurchases, including, among others, open market purchases and accelerated share repurchase programs. The amount and timing of repurchases will depend upon several factors, including general economic and market conditions and trading restrictions.

15. Retirement Plans:

The Company maintains six qualified contributory savings plans as allowed under Section 401(k) of the Internal Revenue Code and Section 1165(e) of the Puerto Rico Income Tax Act of 1954 (the “401(k) Plans”). The 401(k) Plans permit participant contributions and allow elective and, in certain situations, non-elective Company contributions based on each participant’s contribution or a specified percentage of eligible wages. Participants may defer a percentage of their annual compensation subject to the limits defined in the 401(k) Plans. The Company recorded expense of $55.8 million, $50.7 million and $45.2 million for the years ended December 31, 2018, 2017 and 2016, respectively, primarily related to the 401(k) Plans.

16. Commitments and Contingencies:

The Company expects that audits, inquiries and investigations from government authorities and agencies will occur in the ordinary course of business. Such audits, inquiries and investigations and their ultimate resolutions, individually or in the aggregate, could have a material adverse effect on the Company’s business, financial condition, results of operations, cash flows and the trading price of its securities. The Company has not included an accrual for these matters as of December 31, 2018 in its Condensed Consolidated Financial Statements, as the variables affecting any potential eventual liability depend on the currently unknown facts and circumstances that arise out of, and are specific to, any particular future audit, inquiry and investigation and cannot be reasonably estimated at this time.

In the ordinary course of business, the Company becomes involved in pending and threatened legal actions and proceedings, most of which involve claims of medical malpractice related to medical services provided by the Company’s affiliated physicians. The Company’s contracts with hospitals generally require the Company to indemnify them and their affiliates for losses resulting from the negligence of the Company’s affiliated physicians. The Company may also become subject to other lawsuits which could involve large claims and significant costs. The Company believes, based upon a review of pending actions and proceedings, that the outcome of such legal actions and proceedings will not have a material adverse effect on its business, financial condition, results of operations, cash flows and the trading price of its securities. The outcome of such actions and proceedings, however, cannot be predicted with certainty and an unfavorable resolution of one or more of them could have a material adverse effect on the Company’s business, financial condition, results of operations, cash flows and the trading price of its securities.

Although the Company currently maintains liability insurance coverage intended to cover professional liability and certain other claims, the Company cannot assure that its insurance coverage will be adequate to cover liabilities arising out of claims asserted against it in the future where the outcomes of such claims are unfavorable. With respect to professional liability risk, the Company generally self-insures a portion of this risk through its wholly owned captive insurance subsidiary. Liabilities in excess of the Company’s insurance coverage, including coverage for professional liability and certain other claims, could have a material adverse effect on the Company’s business, financial condition, results of operations, cash flows and the trading price of its securities.

The Company leases space for its regional, medical and business offices, storage space and temporary housing of medical staff. The Company also leases an aircraft. Rent expense for the years ended December 31, 2018, 2017 and 2016 was $42.9 million, $42.6 million and $38.0 million, respectively.

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Future minimum lease payments under non-cancelable operating leases as of December 31, 2018 are as follows (in thousands):

2019 |  | $ | 30,824 |
2020 |  |  | 22,038 |
2021 |  |  | 17,946 |
2022 |  |  | 12,708 |
2023 |  |  | 9,440 |
Thereafter |  |  | 10,522 |
|  | $ | 103,478 |

17. Selected Quarterly Financial Information (Unaudited):

The following tables set forth a summary of the Company’s selected quarterly financial information for each of the four quarters ended December 31, 2018 and 2017 (in thousands, except for per share data):

|  | 2018 Quarters |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
Net revenue |  | $ | 901,857 |  |  | $ | 915,918 |  |  | $ | 896,652 |  |  | $ | 932,696 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits |  |  | 631,830 |  |  |  | 620,980 |  |  |  | 625,717 |  |  |  | 657,061 |
Practice supplies and other operating expenses |  |  | 30,655 |  |  |  | 31,833 |  |  |  | 30,159 |  |  |  | 29,381 |
General and administrative expenses |  |  | 108,776 |  |  |  | 107,908 |  |  |  | 102,905 |  |  |  | 112,789 |
Depreciation and amortization |  |  | 26,163 |  |  |  | 26,518 |  |  |  | 28,709 |  |  |  | 29,891 |
Total operating expenses |  |  | 797,424 |  |  |  | 787,239 |  |  |  | 787,490 |  |  |  | 829,122 |
Income from operations |  |  | 104,433 |  |  |  | 128,679 |  |  |  | 109,162 |  |  |  | 103,574 |
Investment and other income |  |  | 1,464 |  |  |  | 1,202 |  |  |  | 1,302 |  |  |  | 967 |
Interest expense |  |  | (19,935 | ) |  |  | (21,604 | ) |  |  | (21,782 | ) |  |  | (25,448 | )
Equity in earnings of unconsolidated affiliates |  |  | 1,525 |  |  |  | 1,257 |  |  |  | 1,766 |  |  |  | 2,277 |
Total non-operating expenses |  |  | (16,946 | ) |  |  | (19,145 | ) |  |  | (18,714 | ) |  |  | (22,204 | )
Income before income taxes |  |  | 87,487 |  |  |  | 109,534 |  |  |  | 90,448 |  |  |  | 81,370 |
Income tax provision |  |  | (24,059 | ) |  |  | (30,122 | ) |  |  | (24,873 | ) |  |  | (21,156 | )
Net income |  | $ | 63,428 |  |  | $ | 79,412 |  |  | $ | 65,575 |  |  | $ | 60,214 |
Per common and common equivalent share data (1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.68 |  |  | $ | 0.85 |  |  | $ | 0.72 |  |  | $ | 0.69 |
Diluted |  | $ | 0.68 |  |  | $ | 0.85 |  |  | $ | 0.72 |  |  | $ | 0.68 |
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 92,859 |  |  |  | 92,987 |  |  |  | 90,984 |  |  |  | 87,810 |
Diluted |  |  | 93,505 |  |  |  | 93,529 |  |  |  | 91,359 |  |  |  | 88,258 |

(1) | Basic and diluted per share amounts are computed for each of the periods presented. Accordingly, the sum of the quarterly per share amounts may not agree with the full year amount.

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|  | 2017 Quarters |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
Net revenue |  | $ | 835,597 |  |  | $ | 842,944 |  |  | $ | 868,951 |  |  | $ | 910,820 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits |  |  | 572,385 |  |  |  | 561,418 |  |  |  | 586,476 |  |  |  | 617,455 |
Practice supplies and other operating expenses |  |  | 27,796 |  |  |  | 30,872 |  |  |  | 29,497 |  |  |  | 32,353 |
General and administrative expenses |  |  | 103,765 |  |  |  | 103,015 |  |  |  | 101,430 |  |  |  | 108,895 |
Depreciation and amortization |  |  | 25,614 |  |  |  | 25,735 |  |  |  | 25,116 |  |  |  | 26,414 |
Total operating expenses |  |  | 729,560 |  |  |  | 721,040 |  |  |  | 742,519 |  |  |  | 785,117 |
Income from operations |  |  | 106,037 |  |  |  | 121,904 |  |  |  | 126,432 |  |  |  | 125,703 |
Investment and other income |  |  | 576 |  |  |  | 365 |  |  |  | 235 |  |  |  | 2,777 |
Interest expense |  |  | (17,752 | ) |  |  | (18,535 | ) |  |  | (18,428 | ) |  |  | (19,844 | )
Equity (loss) in earnings of unconsolidated affiliate |  |  | 797 |  |  |  | 689 |  |  |  | (240 | ) |  |  | (294 | )
Total non-operating expenses |  |  | (16,379 | ) |  |  | (17,481 | ) |  |  | (18,433 | ) |  |  | (17,361 | )
Income before income taxes |  |  | 89,658 |  |  |  | 104,423 |  |  |  | 107,999 |  |  |  | 108,342 |
Income tax (provision) benefit |  |  | (34,967 | ) |  |  | (40,725 | ) |  |  | (42,119 | ) |  |  | 27,761 |
Net income |  | $ | 54,691 |  |  | $ | 63,698 |  |  | $ | 65,880 |  |  | $ | 136,103 |
Per common and common equivalent share data (2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.59 |  |  | $ | 0.69 |  |  | $ | 0.71 |  |  | $ | 1.47 |
Diluted |  | $ | 0.59 |  |  | $ | 0.69 |  |  | $ | 0.71 |  |  | $ | 1.46 |
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 92,360 |  |  |  | 92,181 |  |  |  | 92,589 |  |  |  | 92,756 |
Diluted |  |  | 93,143 |  |  |  | 92,812 |  |  |  | 92,881 |  |  |  | 93,159 |

(2) | Basic and diluted per share amounts are computed for each of the periods presented. Accordingly, the sum of the quarterly per share amounts may not agree with the full year amount.

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ITEM 9. | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

None.

ITEM 9A. | CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

We carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended). Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures were effective as of the end of the period covered by this report.

Management’s Annual Report on Internal Control Over Financial Reporting

Management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting as defined in Rule 13a-15(f) or 15d-15(f) promulgated under the Securities Exchange Act of 1934, as amended. The Company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the Company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the Company are being made only in accordance with authorizations of management and directors of the Company; and (iii) provide reasonable assurance regarding the prevention or timely detection of unauthorized acquisition, use, or disposition of the Company’s assets that could have a material effect on the Company’s financial statements.

Internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements prepared for external purposes in accordance with generally accepted accounting principles. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management assessed the effectiveness of the Company’s internal control over financial reporting as of the end of the period covered by this report. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”) in “Internal Control—Integrated Framework (2013).” Based on our assessment we concluded that, as of the end of the period covered by this report, the Company’s internal control over financial reporting was effective based on those criteria.

The Company’s independent registered certified public accounting firm, PricewaterhouseCoopers LLP, has audited our internal control over financial reporting as of December 31, 2018 as stated in their report which appears in this Annual Report on Form 10-K.

Changes in Internal Control Over Financial Reporting

No change in our internal control over financial reporting occurred during our last fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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ITEM 9B. | OTHER INFORMATION

On February 12, 2019, Mr. David A. Clark, the President, MEDNAX National Medical Group, of the Company, was appointed as Chief Operating Officer of the Company. Mr. Clark succeeds Mr. Joseph M. Calabro, the current President and Chief Operating Officer of the Company, who will continue to serve as President of the Company. Mr. Clark, age 52, joined the Company in May 2001 and has served in various capacities, with executive officer responsibilities from January 1, 2009.

In connection with his appointment as Chief Operating Officer, Mr. Clark and the Company, through a wholly-owned subsidiary, entered into an Employment Agreement (the “Clark Employment Agreement”) on February 12, 2019, which replaced Mr. Clark’s previous employment agreement with a wholly-owned subsidiary of the Company. Also on February 12, 2019, the Company, through a wholly-owned subsidiary, entered into an Employment Agreement (the “Andreano Employment Agreement” and, together with the Clark Employment Agreement, the “Employment Agreements”) with Mr. Dominic J. Andreano, the Senior Vice President, General Counsel and Secretary of the Company, which replaced Mr. Andreano’s previous employment agreement with a wholly-owned subsidiary of the Company.

Pursuant to the Employment Agreements, each of Mr. Clark and Mr. Andreano will receive an annual base salary as determined from time to time by his respective supervisor and will be eligible to receive an annual performance bonus in accordance with incentive programs approved from time to time by the Compensation Committee of the Company’s Board of Directors (the “Compensation Committee”), with a target bonus of 100% of his base salary and a maximum bonus potential of 200% of his base salary. The Employment Agreements also provide for participation in customary Company benefit plans and incentive compensation plans.

Upon the termination of Mr. Clark’s employment for certain specified reasons, the Clark Employment Agreement provides for severance payments of up to 12 to 24 months of Mr. Clark’s base salary and a pro rata bonus for the year in which his termination occurs, depending on the basis for termination, plus, in certain cases, the payment of an amount equal to the greater of (x) 1.5 times the Average Annual Performance Bonus (as defined in the Clark Employment Agreement) and (y) Mr. Clark’s bonus for the year immediately preceding his termination. Upon the termination of Mr. Andreano’s employment for certain specified reasons, the Andreano Employment Agreement provides for severance payments of up to 12 to 24 months of Mr. Andreano’s base salary and a pro rata bonus for the year in which his termination occurs, depending on the basis for termination, plus, in certain cases, the payment of an amount equal to the Average Annual Performance Bonus (as defined in the Andreano Employment Agreement). In addition, depending on the basis for termination, all equity awards granted to Mr. Clark or Mr. Andreano, as applicable, by the Company prior to such termination will become fully vested and, if applicable, exercisable.

The Employment Agreements provide for customary protections of the Company’s confidential information and intellectual property and that Mr. Clark or Mr. Andreano, as applicable, will not, during the term of his employment and for a period of 18, 24 or 30 months thereafter, depending on the basis for termination, compete with the Company, hire away from or solicit to leave the Company its employees and independent contractors, or interfere in the Company’s relationships with its hospitals, other healthcare facilities, vendors, clients and other third parties.

The Employment Agreements have three-year terms and are subject to automatic renewals for successive one-year terms.

The foregoing descriptions of the Clark Employment Agreement and Andreano Employment Agreement are qualified in their entirety by reference to the terms of the Clark Employment Agreement and Andreano Employment Agreement, copies of which are attached to this Form 10-K as Exhibits 10.37 and 10.35, respectively, and are incorporated herein by reference.

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PART III

ITEM 10. | DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by this Item is incorporated by reference to the applicable information in the definitive proxy statement for our 2019 Annual Meeting of Shareholders, which is to be filed with the SEC within 120 days after our fiscal year end.

ITEM 11. | EXECUTIVE COMPENSATION

The information required by this Item is incorporated by reference to the applicable information in the definitive proxy statement for our 2019 Annual Meeting of Shareholders, which is to be filed with the SEC within 120 days after our fiscal year end.

ITEM 12. | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

SECURITIES AUTHORIZED FOR ISSUANCE UNDER EQUITY COMPENSATION PLANS

The following table provides information as of December 31, 2018, with respect to shares of our common stock that may be issued under existing equity compensation plans, including our Amended and Restated 2008 Incentive Compensation Plan, as amended (“Amended and Restated 2008 Incentive Plan”), our 2004 Incentive Compensation Plan, as amended (“2004 Incentive Plan”), our ESPP and our SPP.

Plan Category |  | Number of securities to be issued upon exercise of outstanding options, warrants and rights |  |  | Weighted-average exercise price of outstanding options, warrants and rights |  |  | Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) |
|  | (a) |  |  | (b) |  |  | (c) |
Equity compensation plans approved by security holders |  |  | 112,976 | (1) |  | $ | 27.51 |  |  |  | 3,574,501 | (2)
Equity compensation plans not approved by security holders |  |  | N/A |  |  |  | N/A |  |  |  | N/A |
Total |  |  | 112,976 |  |  | $ | 27.51 |  |  |  | 3,574,501 |

(1) | All shares are issuable under the Amended and Restated 2008 Incentive Plan, as amended.

(2) | Under the Amended and Restated 2008 Incentive Plan, as amended, 1,997,719 shares remain available for future issuance, and under the ESPP and the SPP, an aggregate of 1,576,782 shares remain available for future issuance.

The remaining information required by this Item is incorporated by reference to the applicable information in the definitive proxy statement for our 2019 Annual Meeting of Shareholders, which is to be filed with the SEC within 120 days after our fiscal year end.

ITEM 13. | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this Item is incorporated by reference to the applicable information in the definitive proxy statement for our 2019 Annual Meeting of Shareholders, which is to be filed with the SEC within 120 days after our fiscal year end.

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ITEM 14. | PRINCIPAL ACCOUNTING FEES AND SERVICES

The information required by this Item is incorporated by reference to the applicable information in the definitive proxy statement for our 2019 Annual Meeting of Shareholders, which is to be filed with the SEC within 120 days after our fiscal year end.

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PART IV

ITEM 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULE

(a)(1) Financial Statements

The information required by this Item is included in Item 8 of Part II of this Form 10-K.

(a)(2) Financial Statement Schedule

The following financial statement schedule for the years ended December 31, 2018, 2017 and 2016, is included in this Form 10-K as set forth below (in thousands).

MEDNAX, INC.

Schedule II: Valuation and Qualifying Accounts

|  | Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
Allowance for contractual adjustments and uncollectibles: |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  | $ | 1,286,035 |  |  | $ | 1,224,366 |  |  | $ | 1,129,301 |
Amount charged against operating revenue |  |  | 8,944,637 |  |  |  | 8,285,317 |  |  |  | 7,464,030 |
Accounts receivable contractual adjustments and write-offs (net of recoveries) |  |  | (8,741,603 | ) |  |  | (8,223,648 | ) |  |  | (7,368,965 | )
Balance at end of year |  | $ | 1,489,069 |  |  | $ | 1,286,035 |  |  | $ | 1,224,366 |

All other schedules have been omitted because they are not applicable, not required or the information is included elsewhere herein.

(a)(3) Exhibits

See Item 15(b) of this Form 10-K.

(b) Exhibits

2.1 |  | Agreement and Plan of Merger, dated as of December 29, 2008, between MEDNAX, Inc., Pediatrix Medical Group, Inc. and PMG Merger Sub, Inc. (incorporated by reference to Exhibit 2.1 to MEDNAX’s Current Report on Form 8-K dated January 2, 2009).
3.1 |  | Composite Articles of Incorporation of MEDNAX, Inc. (incorporated by reference to Exhibit 3.1 to MEDNAX’s Annual Report on Form 10-K for the period ended December 31, 2013).
3.2 |  | Amended and Restated By-laws of MEDNAX, Inc. (incorporated by reference to Exhibit 3.1 to MEDNAX’s Current Report on Form 8-K dated November 6, 2018).
10.1 |  | Form of 5.25% Senior Notes due 2023 (incorporated by reference to Exhibit A of the First Supplemental Indenture filed as Exhibit 4.3 to MEDNAX’s Current Report on Form 8-K dated December 8, 2015).
10.2 |  | Form of 6.25% Senior Notes due 2027 (incorporated by reference to Exhibit A of the Fifth Supplemental Indenture filed as Exhibit 4.3 to MEDNAX’s Current Report on Form 8-K dated November 13, 2018).
10.3 |  | Indenture, dated as of December 8, 2015, by and between MEDNAX, Inc. and U.S. Bank National Association, as Trustee. (incorporated by reference to Exhibit 4.2 to MEDNAX’s Current Report on Form 8-K dated December 8, 2015).

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10.4 |  | First Supplemental Indenture dated as of December 8, 2015 to the Indenture, dated as of December 8, 2015, by and among MEDNAX, Inc., certain of its subsidiaries and U.S. Bank National Association, as Trustee. (incorporated by reference to Exhibit 4.3 to MEDNAX’s Current Report on Form 8-K dated December 8, 2015).
10.5 |  | Second Supplemental Indenture dated as of March 30, 2017 to the Indenture, dated as of December 8, 2015, by and among MEDNAX, Inc., certain of its subsidiaries and U.S. Bank National Association, as Trustee. (incorporated by reference to Exhibit 10.4 to MEDNAX’s Annual Report on Form 10-K for the period ended December 31, 2017).
10.6 |  | Third Supplemental Indenture dated as of November 9, 2017 to the Indenture, dated as of December 8, 2015, by and among MEDNAX, Inc., certain of its subsidiaries and U.S. Bank National Association, as Trustee. (incorporated by reference to Exhibit 10.5 to MEDNAX’s Annual Report on Form 10-K for the year ended December 31, 2017).
10.7+ |  | Fourth Supplemental Indenture dated as of November 13, 2018 to the Indenture, dated as of December 8, 2015, by and among MEDNAX, Inc., certain of its subsidiaries and U.S. Bank National Association, as Trustee.
10.8 |  | Fifth Supplemental Indenture dated as of November 13, 2018 to Indenture, dated as of December 8, 2015, by and among MEDNAX, Inc., certain of its subsidiaries and U.S. Bank National Association, as Trustee. (incorporated by reference to Exhibit 4.3 to MEDNAX’s Current Report on Form 8-K dated November 13, 2018).
10.9 |  | Credit Agreement, dated as of October 30, 2017, among MEDNAX, Inc., certain of its domestic subsidiaries from time to time party thereto as Guarantors, the Lender parties thereto, JPMorgan Chase Bank, N.A. as Administrative Agent and Bank of America, N.A., Fifth Third Bank, Mizuho Bank, Ltd., SunTrust Bank, The Bank of Tokyo-Mitsubishi UFJ, Ltd., and Wells Fargo Bank, National Association as Syndication Agents, and BBVA Compass, Citizens Bank, N.A., PNC Bank, Regions Bank, and U.S. Bank National Association, as Senior Documentation Agents and BB&T as Documentation Agent. JPMorgan Chase Bank, N.A, Fifth Third Bank, Merrill Lynch, Pierce, Fenner & Smith Incorporated, Mizuho Bank, Ltd., SunTrust Robinson Humphrey, Inc., The Bank of Tokyo-Mitsubishi UFJ, Ltd., and Wells Fargo Securities, LLC, acted as Joint Lead Arrangers and Joint Bookrunners. (incorporated by reference to Exhibit 10.1 to MEDNAX’s Quarterly Report on Form 10-Q for the period ended September 30, 2017).
10.10+ |  | Amendment No. 1, dated as of November 21, 2018, to the Credit Agreement, dated as of October 30, 2017, among MEDNAX, Inc. certain of its domestic subsidiaries from time to time party thereto as Guarantors, the Lenders parties thereto and JPMorgan Chase Bank, N.A. as Administrative Agent.
10.11 |  | Amended and Restated Stock Option Plan of Pediatrix dated as of June 4, 2003 (incorporated by reference to Exhibit 10.5 to Pediatrix’s Quarterly Report on Form 10-Q for the period ended June 30, 2003).*
10.12 |  | First Amendment, dated December 29, 2008, to Pediatrix Medical Group, Inc. Amended and Restated Stock Option Plan (incorporated by reference to Exhibit 10.7 to MEDNAX’s Current Report on Form 8-K dated January 2, 2009).*
10.13 |  | Amended and Restated MEDNAX, Inc. 1996 Non-Qualified Employee Stock Purchase Plan (incorporated by reference to Exhibit A to MEDNAX’s Definitive Proxy Statement on Schedule 14A, filed with the SEC on September 18, 2015).*
10.14 |  | 2015 Non-Qualified Stock Purchase Plan of MEDNAX, Inc., dated September 14, 2015 (incorporated by reference to Exhibit B to MEDNAX’s Proxy Statement dated September 18, 2015).*
10.15 |  | Executive Non-Qualified Deferred Compensation Plan of Pediatrix, dated October 13, 1997 (incorporated by reference to Exhibit 10.35 to Pediatrix’s Quarterly Report on Form 10-Q for the period ended June 30, 1998).*

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10.16 |  | Amended and Restated Thrift and Profit Sharing Plan of Pediatrix (incorporated by reference to Exhibit 4.5 to Pediatrix’s Registration Statement on Form S-8 (Registration No. 333-101222)).*
10.17 |  | Pediatrix Medical Group of Puerto Rico Thrift and Profit Sharing Plan (incorporated by reference to Exhibit 4.3 to Pediatrix’s Registration Statement on Form S-8 dated December 9, 2004).*
10.18 |  | Pediatrix Medical Group, Inc. 2004 Incentive Compensation Plan (incorporated by reference to Exhibit A of Pediatrix’s Proxy Statement on Schedule 14A dated April 9, 2004).*
10.19 |  | Second Amendment, dated December 29, 2008, to Pediatrix Medical Group, Inc. 2004 Incentive Compensation Plan (incorporated by reference to Exhibit 10.8 to MEDNAX’s Current Report on Form 8-K dated January 2, 2009).*
10.20 |  | MEDNAX, Inc. Amended and Restated 2008 Incentive Compensation Plan, as amended (incorporated by reference to Exhibit 10.1 to MEDNAX’s Current Report on Form 8-K dated February 19, 2014).*
10.21 |  | Pediatrix Medical Group, Inc. Form of Stock Option Agreement for Stock Options Awarded Under the Amended and Restated Stock Option Plan (incorporated by reference to Exhibit 10.3 to Pediatrix’s Current Report on Form 8-K dated February 23, 2005).*
10.22 |  | Pediatrix Medical Group, Inc. Form of Incentive Stock Option Agreement for Incentive Stock Options Awarded Under the 2004 Incentive Compensation Plan (incorporated by reference to Exhibit 10.4 to Pediatrix’s Current Report on Form 8-K dated February 23, 2005).*
10.23 |  | Pediatrix Medical Group, Inc. Form of Non-Qualified Stock Option Agreement for Non-Qualified Stock Options Awarded Under the 2004 Incentive Compensation Plan (incorporated by reference to Exhibit 10.5 to Pediatrix’s Current Report on Form 8-K dated February 23, 2005).*
10.24 |  | Pediatrix Medical Group, Inc. Form of Restricted Stock Agreement for Restricted Stock Awarded Under the 2004 Incentive Compensation Plan (incorporated by reference to Exhibit 10.6 to Pediatrix’s Current Report on Form 8-K dated February 23, 2005).*
10.25 |  | MEDNAX, Inc. Form of Non-Qualified Stock Option Agreement for Non-Qualified Stock Options Awarded Under the 2008 Incentive Compensation Plan (incorporated by reference to Exhibit 10.17 to MEDNAX’s Annual Report on Form 10-K for the year ended December 31, 2008).*
10.26 |  | MEDNAX, Inc. Form of Restricted Stock Agreement for Restricted Stock Awarded Under the 2008 Incentive Compensation Plan (incorporated by reference to Exhibit 10.18 to MEDNAX’s Annual Report on Form 10-K for the year ended December 31, 2008).*
10.27 |  | Employment Agreement, dated August 7, 2011, by and between MEDNAX Services, Inc. and Roger J. Medel, M.D. (incorporated by reference to Exhibit 10.1 to MEDNAX’s Current Report on Form 8-K dated August 10, 2011).*
10.28 |  | First Amendment to Employment Agreement, dated October 4, 2017, by and between MEDNAX Services, Inc. and Roger J. Medel, M.D. (incorporated by reference to Exhibit 10.1 to MEDNAX’s Current Report on Form 8-K dated October 4, 2017).*
10.29 |  | Employment Agreement, dated August 20, 2008, by and between Pediatrix Medical Group, Inc. and Joseph M. Calabro (incorporated by reference to Exhibit 10.2 to Pediatrix’s Current Report on Form 8-K dated August 22, 2008).*
10.30 |  | Amendment Agreement, dated December 29, 2008, between MEDNAX, Inc., Pediatrix Medical Group, Inc. and Joseph M. Calabro (incorporated by reference to Exhibit 10.3 to MEDNAX’s Current Report on Form 8-K dated January 2, 2009).*
10.31 |  | Employment Agreement, dated February 24, 2010, by and between MEDNAX Services, Inc. and Vivian Lopez-Blanco (incorporated by reference to Exhibit 10.28 to MEDNAX’s Annual Report on Form 10-K for the year ended December 31, 2009).*

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10.32 |  | Employment Agreement, dated February 12, 2018, by and between MEDNAX Services, Inc. and Vivian Lopez-Blanco (incorporated by reference to Exhibit 10.28 to MEDNAX’s Annual Report on Form 10-K for the year ended December 31, 2017).*
10.33 |  | Employment Agreement, dated August 22, 2018, by and between MEDNAX Services, Inc. and Stephen Farber (incorporated by reference to Exhibit 10.1 to MEDNAX’s Current Report on Form 8-K dated August 28, 2018).*
10.34 |  | Employment Agreement, dated February 12, 2018, by and between MEDNAX Services, Inc. and Dominic J. Andreano (incorporated by reference to Exhibit 10.29 to MEDNAX’s Annual Report on Form 10-K for the year ended December 31, 2017).*
10.35+ |  | Employment Agreement, dated February 12, 2019, by and between MEDNAX Services, Inc. and Dominic J. Andreano.*
10.36 |  | Employment Agreement, dated February 12, 2018, by and between MEDNAX Services, Inc. and David A. Clark (incorporated by reference to Exhibit 10.30 to MEDNAX’s Annual Report on Form 10-K for the year ended December 31, 2017).*
10.37+ |  | Employment Agreement, dated February 12, 2019, by and between MEDNAX Services, Inc. and David A. Clark.*
10.38 |  | Restricted Shares Units Agreement for Roger J. Medel, M.D. dated August 7, 2011 (incorporated by reference to Exhibit 10.2 to MEDNAX’s Current Report on Form 8-K dated August 10, 2011).*
10.39 |  | Form of Indemnification Agreement between Pediatrix and each of its directors and executive officers. (incorporated by reference to Exhibit 10.6 to Pediatrix’s Annual Report on Form 10-K for the year ended December 31, 2003).*
10.40 |  | Form of Exclusive Management and Administrative Services Agreement with affiliated professional contractors (incorporated by reference to Exhibit 10.31 to MEDNAX’s Annual Report on Form 10-K for the year ended December 31, 2011).
10.41 |  | Confirmation—Uncollared Accelerated Share Repurchase dated August 31, 2018 between Bank of America, N.A. and MEDNAX, Inc. (incorporated by reference to Exhibit 10.1 to MEDNAX’s Quarterly Report on Form 10-Q for the period ended September 30, 2018).**
21.1+ |  | Subsidiaries of the Registrant.
23.1+ |  | Consent of PricewaterhouseCoopers LLP.
31.1+ |  | Certification of Chief Executive Officer pursuant to Securities Exchange Act Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2+ |  | Certification of Chief Financial Officer pursuant to Securities Exchange Act Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32+ |  | Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS+ |  | XBRL Instance Document.
101.SCH+ |  | XBRL Taxonomy Extension Schema Document.
101.CAL+ |  | XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF+ |  | XBRL Taxonomy Extension Definition Linkbase Document.
101.LAB+ |  | XBRL Taxonomy Extension Label Linkbase Document.
101.PRE+ |  | XBRL Taxonomy Extension Presentation Linkbase Document.

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* | Management contracts or compensation plans, contracts or arrangements.

** | Certain confidential material contained in the document has been omitted and filed separately with the Securities and Exchange Commission. Confidential treatment has been granted with respect to this omitted information.

+ | Filed herewith.

ITEM 16. | FORM 10-K SUMMARY

None.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

|  |  |  | MEDNAX, INC.
Date: February 14, 2019 |  |  |  | By: |  | /s/ Roger J. Medel, M.D.
|  |  |  |  |  | Roger J. Medel, M.D.
|  |  |  |  |  | Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant in the capacities and on the dates indicated.

Signature |  | Title |  | Date
/s/ Roger J. Medel, M.D. Roger J. Medel, M.D. |  | Chief Executive Officer (Principal Executive Officer) |  | February 14, 2019
/s/ Stephen D. Farber Stephen D. Farber |  | Chief Financial Officer (Principal Financial Officer) |  | February 14, 2019
/s/ John C. Pepia John C. Pepia |  | Chief Accounting Officer (Principal Accounting Officer) |  | February 14, 2019
/s/ Cesar L. Alvarez Cesar L. Alvarez |  | Director and Chairman of the Board |  | February 14, 2019
/s/ Manuel Kadre Manuel Kadre |  | Lead Independent Director |  | February 14, 2019
/s/ Karey D. Barker Karey D. Barker |  | Director |  | February 14, 2019
/s/ Waldemar A. Carlo, M.D. Waldemar A. Carlo, M.D. |  | Director |  | February 14, 2019
/s/ Michael B. Fernandez Michael B. Fernandez |  | Director |  | February 14, 2019
/s/ Paul G. Gabos Paul G. Gabos |  | Director |  | February 14, 2019
/s/ Pascal J. Goldschmidt, M.D. Pascal J. Goldschmidt, M.D. |  | Director |  | February 14, 2019
/s/ Enrique J. Sosa, Ph.D. Enrique J. Sosa, Ph.D. |  | Director |  | February 14, 2019

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