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This variable is contained in the following files:
SAS Name
BENE_TOT_COINSRNC_DAYS_CNT
The count of the total number of coinsurance days involved with the beneficiary's stay in a facility.
During each benefit period (calendar year) the beneficiary is responsible for coinsurance for particular days of inpatient care (no coinsurance from day 1 through day 60, then for days 61 through 90 there is 25% coinsurance), SNF care (no coinsurance until day 21, then is 1/8 of inpatient hospital deductible amount through 100th day of SNF).
Different rules apply for lifetime reserve days, etc.
Source: NCH