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Medicare question

What dates are Medicare Annual Enrollment and what can I change?

Medicare's Annual Enrollment Period runs October 15 through December 7 each year. During this time you can switch Medicare Advantage plans, move from Original Medicare to Medicare Advantage or back, and change your Part D drug plan.

Last updated: August 17, 2026

Where this answer comes from, and what it can't tell you

Written from the published Medicare rules and the source material preserved for this question. It explains the topic in general terms. It is not a reading of your own coverage documents, not a prediction of how Medicare or a plan will decide a case, and not advice about a particular plan. Your current notice, policy, Evidence of Coverage, or formulary controls when it differs from a general explanation. Resting Sycamore is not Medicare.gov and is not endorsed by any government agency.

What determines the answer to “What dates are Medicare Annual Enrollment and what can I change”?

Medicare's Annual Enrollment Period runs October 15 through December 7 each year. During this time you can switch Medicare Advantage plans, move from Original Medicare to Medicare Advantage or back, and change your Part D drug plan.

Which details can change the answer to “What dates are Medicare Annual Enrollment and what can I change”?

Every year from October 15 to December 7, Medicare opens a window where you can make changes to your coverage. Whatever you choose takes effect January 1 of the following year. This is the main time most people review and update their plans. During Annual Enrollment you can switch from one Medicare Advantage plan to another, drop Medicare Advantage and return to Original Medicare, or add and change a standalone Part D prescription drug plan . If you are on Original Medicare with a standalone drug plan, you can swap to a different drug plan or drop it entirely, though dropping without other creditable coverage could mean a penalty later. There is also a separate window called the Medicare Advantage Open Enrollment Period , which runs January 1 through March 31. During that window, people already enrolled in a Medicare Advantage plan can switch to a different Advantage plan or move back to Original Medicare. You cannot, however, use that January window to enroll in Medicare Advantage for the first time if you are currently on Original Medicare. Plan details, premiums, drug formularies, and networks can all change from year to year, so reviewing your Annual Notice of Change, the letter your plan sends each fall, before making any decision is a smart starting point.

For you, this means October 15 is the date to put on your calendar each year to review whether your current plan still fits your needs and budget.

What should you verify before acting on “What dates are Medicare Annual Enrollment and what can I change”?

Confirm the effective date, notice deadline, and whether a Special Enrollment Period applies before changing coverage. The controlling notice or enrollment record matters more than a general example.

Where should you look next?

What else do people ask about determines the answer to “What dates are Medicare Annual Enrollment and what can I change”?

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