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This variable is contained in the following files: Master Beneficiary Summary File (MBSF) Base
Short SAS Name
RDSIND09
SAS Name
RDS_IND_09

This variable indicates if the beneficiary was enrolled in an employer-sponsored prescription drug plan that qualified for Part D’s retiree drug subsidy (RDS) for a given month (September).

Comments

Some employers offer prescription drug plans to their retirees, and Part D pays a subsidy to plans that offer coverage that is equivalent to (or better than) conventional Part D benefits.
CMS does not collect PDEs for beneficiaries that are enrolled in RDS-eligible plans.
There are 12 monthly variables - where the 01 through 12 at the end of the variable name correspond with the month (e.g., 01 is January and 12 is December).