Your first chance to sign up for Medicare Advantage is during your Medicare Initial Enrollment Period (IEP). The IEP for Medicare starts 3 months before the month you turn 65 and ends 3 months after.
If you are already enrolled in Medicare Advantage, you can switch plans during the Medicare Advantage Open Enrollment Period (OEP). The Medicare Advantage OEP runs from Jan. 1 to March 31, or the annual enrollment period for Medicare.
If you have Original Medicare and want to enroll in Medicare Advantage for the first time, you can choose a Medicare Advantage plan during Medicare’s Annual Enrollment Period (AEP). Medicare’s AEP runs from Oct. 15 to Dec. 7.