What Is The Enrollment Period For Medicare Part D? 
When you first enroll in Medicare Part B you have 60 days to pick a Part D drug plan . If you have a drug plan that is part of a Medicare Advantage plan , and you lose your Advantage coverage -LRB- such as moving out of the service area -RRB- you have 60 days to pick a new plan . Part D annual enrollment runs from October 15 to December 7 . 