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Health Care Costs Payable
9 Months Ended
Sep. 30, 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 nine months ended September 30, 2021 and 2020:
Nine Months Ended
September 30,
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— 444 
Add: Components of incurred health care costs
  Current year48,243 40,777 
  Prior years(771)(448)
Total incurred health care costs (1)
47,472 40,329 
Less: Claims paid
  Current year39,887 34,198 
  Prior years6,639 5,865 
Total claims paid46,526 40,063 
Add: Premium deficiency reserve
Health care costs payable, end of the period, net8,873 7,585 
Add: Reinsurance recoverables
Health care costs payable, end of the period$8,877 $7,593 
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(1)Total incurred health care costs for the nine months ended September 30, 2021 and 2020 in the table above exclude (i) $1 million and $1 million, respectively, for a premium deficiency reserve related to the Company’s Medicaid products, (ii) $45 million and $31 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) $168 million and $173 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 $771 million and $448 million, respectively, in the nine months ended September 30, 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 September 30, 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 $6.8 billion. Substantially all of the Company’s liabilities for IBNR plus expected development on reported claims at September 30, 2021 related to the current year.