Annual Enrollment Period (AEP)
Medicare Annual Enrollment Period (AEP) Explained: What You Can Change
The Medicare Annual Enrollment Period is the one time each year most seniors can make changes to their coverage.
AEP runs from October 15 to December 7
During this time, you can:
Switch Medicare Advantage plans
Return to Original Medicare
Add or change a prescription drug plan
Enroll in Medicare Advantage for the first time
Changes made during AEP take effect January 1.
Missing AEP can mean staying in a plan that no longer fits—sometimes for the entire year.
AEP is your opportunity to stay informed, prepared, and protected.