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Medical Costs Payable (Notes)
 3 Months Ended
Mar. 31, 2020
Medical Costs Payable Text Block Medical Costs Payable
The following table shows the components of the change in medical costs payable for the three months ended March 31:
(in millions)
 
2020
 
2019
Medical costs payable, beginning of period
 
$
21,690

 
$
19,891

Acquisitions
 
—

 
35

Reported medical costs:
 
 
 
 
Current year
 
41,580

 
39,239

Prior years
 
(580
)
 
(300
)
Total reported medical costs
 
41,000

 
38,939

Medical payments:
 
 
 
 
Payments for current year
 
(23,471
)
 
(22,973
)
Payments for prior years
 
(16,447
)
 
(14,753
)
Total medical payments
 
(39,918
)
 
(37,726
)
Medical costs payable, end of period
 
$
22,772

 
$
21,139


For the three months ended March 31, 2020, prior years medical cost reserve development was primarily driven by lower than expected health system utilization. For the three months ended March 31, 2019, the prior years medical cost reserve development included no individual factors that were significant. Medical costs payable included reserves for claims incurred by insured customers but not yet reported to the Company of $14.3 billion and $13.8 billion at March 31, 2020 and December 31, 2019, respectively.