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Health Care Costs Payable
3 Months Ended
Mar. 31, 2021
Health Care and Other Insurance Liabilities [Abstract]  
Health Care Costs Payable Health Care Costs Payable
The following table shows the components of the change in health care costs payable during the three months ended March 31, 2021 and 2020:
Three Months Ended
March 31,
In millions20212020
Health care costs payable, beginning of the period$7,936 $6,879 
Less: Reinsurance recoverables10 
Health care costs payable, beginning of the period, net7,926 6,874 
Acquisition— 412 
Add: Components of incurred health care costs
  Current year16,291 14,764 
  Prior years(652)(464)
Total incurred health care costs (1)
15,639 14,300 
Less: Claims paid
  Current year9,538 8,773 
  Prior years5,767 5,242 
Total claims paid15,305 14,015 
Add: Premium deficiency reserve10 
Health care costs payable, end of the period, net8,267 7,581 
Add: Reinsurance recoverables
Health care costs payable, end of the period$8,272 $7,585 
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(1)Total incurred health care costs for the three months ended March 31, 2021 and 2020 in the table above exclude (i) $7 million and $10 million, respectively, related to a premium deficiency reserve related to the Company’s Medicaid products, (ii) $13 million and $9 million, respectively, of benefit costs recorded in the Health Care Benefits segment that are included in other insurance liabilities on the Company’s unaudited condensed consolidated balance sheets and (iii) $45 million and $68 million, respectively, of benefit costs recorded in the Corporate/Other segment that are included in other insurance liabilities on the Company’s unaudited condensed consolidated balance sheets.

The Company’s estimates of prior years’ health care costs payable decreased by $652 million and $464 million, respectively, in the three months ended March 31, 2021 and 2020, because claims were settled for amounts less than originally estimated (i.e., the amount of claims incurred was lower than originally estimated), primarily due to lower health care cost trends as well as the actual claim submission time being faster than originally assumed (i.e., the Company’s completion factors were higher than originally assumed) in estimating health care costs payable at the end of the prior year.

At March 31, 2021, the Company’s liabilities for the ultimate cost of (i) services rendered to the Company’s Insured members but not yet reported to the Company and (ii) claims which have been reported to the Company but not yet paid (collectively, “IBNR”) plus expected development on reported claims totaled approximately $6.5 billion. The majority of the Company’s liabilities for IBNR plus expected development on reported claims at March 31, 2021 related to the current year.