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Organization and Description of Business (Tables)

9 Months Ended

Sep. 30, 2018

Revenue concentration risk | Revenue

Concentration Risk

Schedule of the Company's third-party payers as a percentage of total

The Company’s third-party payers in excess of 10% of revenue and their related revenue as a percentage of total revenue were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Medicare	29	%		26	%		28	%		26	%
UnitedHealthcare	13	%		14	%		12	%		14	%
	42	%		40	%		40	%		40	%

Gross receivables concentration risk | Accounts receivable

Concentration Risk

Schedule of the Company's third-party payers as a percentage of total

The Company’s significant third-party payers and their related accounts receivable balance as a percentage of total accounts receivable were as follows:

	September 30, 2018			December 31, 2017
Medicare	17	%		22	%
UnitedHealthcare	11	%		9	%

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