XML 27 R12.htm IDEA: XBRL DOCUMENT v3.8.0.1
Medical Costs Payable (Notes)
 9 Months Ended
Sep. 30, 2017
Medical Costs Payable Text Block
Medical Costs Payable
The following table shows the components of the change in medical costs payable for the nine months ended September 30:
(in millions)
 
2017
 
2016
Medical costs payable, beginning of period
 
$
16,391

 
$
14,330

Acquisitions
 
76

 
—

Reported medical costs:
 
 
 
 
Current year
 
97,519

 
87,532

Prior years
 
(690
)
 
(190
)
Total reported medical costs
 
96,829

 
87,342

Medical payments:
 
 
 
 
Payments for current year
 
(81,237
)
 
(72,092
)
Payments for prior years
 
(14,096
)
 
(13,080
)
Total medical payments
 
(95,333
)
 
(85,172
)
Medical costs payable, end of period
 
$
17,963

 
$
16,500


For the nine months ended September 30, 2017, the medical cost reserve development was primarily driven by lower than expected health system utilization levels. For the nine months ended September 30, 2016, no individual factors were significant. Medical costs payable included reserves for claims incurred by insured customers but not yet reported to the Company of $12.4 billion and $11.6 billion at September 30, 2017 and December 31, 2016, respectively.