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Medical Claims and Benefits Payable | 3 Months Ended
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Mar. 31, 2017
Other Liabilities Disclosure [Abstract] |
Medical Claims and Benefits Payable | Medical Claims and Benefits Payable The following table provides the details of our medical claims and benefits payable (including amounts payable for the provision of long-term services and supports, or LTSS) as of the dates indicated.
| March 31, 2017 |  | December 31, 2016
| (In millions)
Fee-for-service claims incurred but not paid (IBNP) | $ | 1,425 |  |  | $ | 1,352 |
Pharmacy payable | 133 |  |  | 112 |
Capitation payable | 36 |  |  | 37 |
Other | 332 |  |  | 428 |
| $ | 1,926 |  |  | $ | 1,929 |
“Other” medical claims and benefits payable include amounts payable to certain providers for which we act as an intermediary on behalf of various government agencies without assuming financial risk. Such receipts and payments do not impact our consolidated statements of income. Non-risk provider payables amounted to $131 million and $225 million as of March 31, 2017 and December 31, 2016, respectively. The following table presents the components of the change in our medical claims and benefits payable for the periods indicated. The amounts presented for “Components of medical care costs related to: Prior periods” represent the amount by which our original estimate of medical claims and benefits payable at the beginning of the period were more than the actual amount of the liability based on information (principally the payment of claims) developed since that liability was first reported.
| Three Months Ended March 31,
| 2017 |  | 2016
| (Dollars in millions)
Medical claims and benefits payable, beginning balance | $ | 1,929 |  |  | $ | 1,685 |
Components of medical care costs related to: |  |  |
Current period | 4,253 |  |  | 3,755 |
Prior periods | (142 | ) |  | (167 | )
Total medical care costs | 4,111 |  |  | 3,588 |
Change in non-risk provider payables | (96 | ) |  | 24 |
Payments for medical care costs related to: |  |  |
Current period | 2,683 |  |  | 2,241 |
Prior periods | 1,335 |  |  | 1,116 |
Total paid | 4,018 |  |  | 3,357 |
Medical claims and benefits payable, ending balance | $ | 1,926 |  |  | $ | 1,940 |
Benefit from prior period as a percentage of: |  |  |
Balance at beginning of period | 7.4 | % |  | 10.0 | %
Premium revenue, trailing twelve months | 0.8 | % |  | 1.2 | %
Medical care costs, trailing twelve months | 0.9 | % |  | 1.3 | %
Reinsurance recoverables of $67 million and $61 million as of March 31, 2017 and December 31, 2016, respectively, are included in receivables. As indicated above, the amounts ultimately paid out on our medical claims and benefits payable liabilities in fiscal years 2017 and 2016 were less than what we had expected when we had established those liabilities. The differences between our original estimates and the amounts ultimately paid out (or now expected to be ultimately paid out) for the most part related to IBNP. While many related factors working in conjunction with one another serve to determine the accuracy of our estimates, we are seldom able to quantify the impact that any single factor has on a change in estimate. In addition, given the variability inherent in the reserving process, we will only be able to identify specific factors if they represent a significant departure from expectations. As a result, we do not expect to be able to fully quantify the impact of individual factors on changes in estimates. We believe that the most significant uncertainties surrounding our IBNP estimates at March 31, 2017 are as follows:
• | In the first quarter of 2017, our Marketplace enrollment across all health plans increased over 500,000 members. Due to limited insight into the cost patterns associated with this large number of new Marketplace members, our liability estimates for these members are subject to more than the usual amount of uncertainty.
• | At our Florida health plan, claims receipts increased significantly over the last few months due to an increase in the receipt of secondary claims, many of which are not our liability. These claims, known as COBA (coordination of benefits agreement) claims, will either be denied or will have very small paid amounts. For this reason, claims denial rates, amounts paid per claim and other claims indicators will be impacted, making our liability estimates subject to more than the usual amount of uncertainty.
• | At our Illinois health plan, we paid a large number of claims in the first quarter of 2017 that had previously been denied and disputed by providers. This has created some distortion in the payment patterns, making our liability estimates subject to more than the usual amount of uncertainty.
We recognized favorable prior period claims development in the amount of $142 million for the three months ended March 31, 2017. This amount represents our estimate as of March 31, 2017, of the extent to which our initial estimate of medical claims and benefits payable at December 31, 2016 was more than the amount that will ultimately be paid out in satisfaction of that liability. We believe the overestimation was due primarily to the following factors:
• | At our Puerto Rico health plan, we increased the outpatient claims liability at December 31, 2016 due to a significant increase in pharmacy utilization, which typically indicates that outpatient costs will also be increasing. However, our actual outpatient costs were ultimately lower than our estimates.
• | At our California health plan, we increased our claims liability at December 31, 2016 to reflect delays in the processing of paper claims. Subsequent adjudication of those claims has demonstrated that our actual additional claim costs were less than the additional amount we added to the December 31, 2016 liability estimate.
• | At our Texas health plan, higher than expected claims recoveries caused our actual costs to be less than expected.

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