Annual Enrollment Period (AEP)
October 15 – December 7 each year — change Medicare Advantage and Part D plans for next year.
Full explanation
The Annual Enrollment Period (AEP), also called Annual Election Period or Open Enrollment, runs October 15 through December 7 every year. During AEP you can: switch from Original Medicare to Medicare Advantage; switch from Medicare Advantage back to Original Medicare; change MA plans; change Part D plans; enroll in Part D for the first time. Changes take effect January 1 of the next year. AEP is NOT the time to switch Medigap plans in most states — Medigap switching usually requires medical underwriting outside your initial 6-month Medigap Open Enrollment.
📎 Primary source: official source
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