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This variable is contained in the following files: Inpatient (Fee-for-Service), Skilled Nursing Facility (Fee-for-Service)
Short SAS Name
COIN_AMT
SAS Name
NCH_BENE_PTA_COINSRNC_LBLTY_AM

The amount of money for which the intermediary has determined that the beneficiary is liable for Part A coinsurance on the institutional claim.

Under Part A, beneficiaries pay coinsurance starting with the 61st day of an inpatient hospital stay (one daily amount for days 61-90, and a higher daily amount for any days after that, which count towards a beneficiary’s 60 lifetime reserve days) or the 21st day of a skilled nursing facility (SNF) stay (a daily amount for days 21-100, after which SNF coverage ends).

This variable is null/missing for home health and hospice claims.

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Source: NCH