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Medical Costs Payable (Notes)
 12 Months Ended
Dec. 31, 2015
Medical Cost Development Disclosure Text Block
Medical Costs Payable
The following table shows the components of the change in medical costs payable for the years ended December 31:
(in millions)
 
2015
 
2014
 
2013
Medical costs payable, beginning of period
 
$
12,040

 
$
11,575

 
$
11,004

Reported medical costs:
 
 
 
 
 
 
Current year
 
104,195

 
94,053

 
90,339

Prior years
 
(320
)
 
(420
)
 
(680
)
Total reported medical costs
 
103,875

 
93,633

 
89,659

Claim payments:
 
 
 
 
 
 
Payments for current year
 
(90,630
)
 
(82,750
)
 
(79,358
)
Payments for prior year
 
(10,955
)
 
(10,418
)
 
(9,730
)
Total claim payments
 
(101,585
)
 
(93,168
)
 
(89,088
)
Medical costs payable, end of period
 
$
14,330

 
$
12,040

 
$
11,575


For the years ended December 31, 2015 and 2014, the favorable medical cost reserve development was due to a number of individual factors that were not material. The net favorable development for the year ended December 31, 2013 was primarily driven by lower than expected health system utilization levels.