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Medicare question

What Is the Medicare Annual Enrollment Period? What You Can Change October 15 Through December 7?

The Medicare Annual Enrollment Period (AEP) is a time when you can make changes to your Medicare coverage. This period starts on October 15 and ends on December 7 every year. During these specific weeks, you have the chance to switch between different types of plans or add new ones if needed. If you're currently enrolled in Medicare Parts C (Medicare Advantage) or D (prescription drug), AEP is when you can make changes that go into effect on January 1.

Last updated: August 23, 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.

Why Is the Annual Enrollment Period Important?

The AEP is crucial for anyone who wants to review and adjust their current Medicare coverage. It's a set time frame during which you have more flexibility in your choices than at other times of the year. For example, if you're unhappy with your current plan or if your needs have changed, this period allows you to switch plans without waiting until next year.

During AEP, you can do several things:

1. Switch from Original Medicare (Parts A and B) to a Medicare Advantage Plan. 2. Move from a Medicare Advantage Plan back to Original Medicare. 3. Change one Medicare Advantage Plan for another within the same insurance company or with a different insurer. 4. Drop your current Part D prescription drug coverage or switch to a new plan.

What Changes Are Not Allowed During the Medicare Annual Enrollment Period?

While AEP provides flexibility, there are certain things you cannot do during this period:

If you have Original Medicare, Medicare Open Enrollment lets you join, drop, or switch a standalone Part D plan for coverage beginning January 1.

Extra Help is an assistance program based on eligibility, not a health or drug plan that you join, leave, or switch during Medicare Open Enrollment. You can apply through Social Security at any time.

Extra Help eligibility is not tied to a January enrollment period. Apply through Social Security when you need assistance.

How Can You Prepare for the Medicare Annual Enrollment Period?

Preparing for AEP is a smart step. It ensures you can make informed decisions about your healthcare coverage without rushing or missing important details. Here are some steps you can take:

1. Review Your Current Coverage: Look over what your current plan covers and any out-of-pocket costs you’ve incurred this year. Consider if these align with your needs.

Use Medicare's Plan Finder to review Medicare Advantage and Part D plans available for the coming plan year. Enter your prescriptions, preferred pharmacies, and other requested information carefully. Then confirm the results against each plan's current formulary, provider directory, Summary of Benefits, and Evidence of Coverage.

Your primary care office can help you list the specialists, facilities, prescriptions, and services involved in your care. It can also tell you which plan networks the office currently participates in. Use that information with Medicare's Plan Finder and the plan's current documents; a clinician's medical guidance does not replace verification of plan coverage and costs.

4. Compare Costs and Benefits: Make sure to compare the premiums, deductibles, copays, and other costs between different plans. Also, check if your preferred doctors are in-network under each plan.

5. Make Your Changes Before December 7: Remember that AEP ends on December 7, so you must finalize any changes by then for them to take effect starting January 1.

What Happens After You Make a Medicare Annual Enrollment Period Change?

After making changes during AEP, your new coverage will begin on January 1 of the following year. If you switch from Original Medicare (Parts A and B) to a Medicare Advantage Plan, your Medicare card might change to reflect this new plan. Similarly, if you switch prescription drug plans, your new Part D benefits will start in the next calendar year.

During AEP, it’s also important to note that you won’t lose any coverage during the transition period between October 15 and December 7. If you don’t make a change, your current plan automatically renews for the following year unless you choose otherwise.

What Should You Confirm After the Medicare Annual Enrollment Period Ends?

After the Annual Enrollment Period, confirm that Medicare or the plan received the enrollment request and note the effective date. Review any membership materials and drug information that arrive. If the confirmation does not match the coverage you selected, follow the notice's correction or appeal instructions promptly.

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