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This variable is contained in the following files: Part D Plan Election Type Beneficiary Summary File
SAS Name
DISENRLMT_DT

This variable is the date the beneficiary disenrolled in the Part D Plan, if applicabl. 

Comments

Source: CMS Common Medicare Environment (CME) 

Date value formatted as: DDMONYYYY Null/missing if the plan remained active; if beneficiary did not disenroll from the plan.