You can switch out of a Medicare Advantage plan during specific windows each year, and the process is straightforward once you know which window applies to you.
Medicare Advantage plans are sold by private insurance companies, but you own your enrollment. If your plan no longer fits your needs — the network changed, your doctors left, premiums rose, or you straightforward want Original Medicare instead — you have the right to disenroll. The timing matters: some windows let you switch anytime, others only once a year, and some are triggered by a life change.
This guide walks you through when you can leave, how to do it, and what happens to your coverage on the day you switch.
Key Takeaways
- The Annual Enrollment Period (October 15 to December 7 each year) lets any Medicare Advantage member switch to Original Medicare or a different Advantage plan without a reason.
- The Medicare Advantage Open Enrollment Period (January 1 to March 31) lets you switch plans once per year if you are already in an Advantage plan, but only to another Advantage plan, not to Original Medicare.
- may have access to life events — moving out of your plan's service area, losing employer coverage, or certain family changes — open a Special Enrollment Period that lasts 60 days and lets you switch anytime.
- You disenroll by calling Medicare (1-800-MEDICARE), using Medicare.gov, or contacting your plan directly; the effective date depends on which window you use and when you submit your request.
- Your new coverage begins the first day of the following month if you disenroll during Annual Enrollment, or when ready in some Special Enrollment situations.
The Annual Enrollment Period: Your main window to leave
The Annual Enrollment Period (AEP) runs from October 15 through December 7 each year. During this window, you can switch from a Medicare Advantage plan to Original Medicare, to a different Advantage plan, or to a Medicare Advantage plan if you are currently on Original Medicare. No reason is required.
If you submit your disenrollment request during AEP, your new coverage takes effect January 1 of the following year. This is the most common and predictable route. You can disenroll by calling Medicare at 1-800-MEDICARE, visiting Medicare.gov and using the "Change Plans" tool, or calling your current plan directly to request a disenrollment form.
Mark October 15 on your calendar each year if you think you might want to switch. Missing this window means waiting until the next October unless a may have access to life event occurs.
The Medicare Advantage Open Enrollment Period: Switch between Advantage plans only
If you are already enrolled in a Medicare Advantage plan, the Medicare Advantage Open Enrollment Period (MAOP) runs January 1 through March 31 each year. During this window, you can switch to a different Medicare Advantage plan once per calendar year.
This window does not let you switch to Original Medicare — only to another Advantage plan. If you want to leave Advantage entirely and go to Original Medicare, you must use the Annual Enrollment Period in October through December. Your new Advantage plan coverage begins the first day of the month after you disenroll from your current plan.
Special Enrollment Periods: Switching outside the regular windows
A Special Enrollment Period (SEP) opens when a may have access to life event occurs, and it lasts 60 days from the date of the event. During a SEP, you can switch to Original Medicare, another Advantage plan, or a Medigap plan, depending on the reason for the SEP.
Common may have access to events include moving out of your plan's service area, losing employer-sponsored coverage, becoming may be able to access for Medicaid, or having a family member become your representative payee. Divorce, death of a spouse, and loss of coverage due to incarceration also trigger a SEP in some cases. The exact rules vary, so contact Medicare at 1-800-MEDICARE to confirm whether your situation qualifies.
If you have a SEP, your new coverage can begin as early as the first day of the month after you disenroll, or in some cases the first day of the month in which you disenroll. Ask Medicare or your plan for the exact effective date when you submit your request.
How to submit your disenrollment request
You have three main routes to disenroll from a Medicare Advantage plan:
- Call Medicare directly: 1-800-MEDICARE (1-800-633-4227). TTY users can call 1-877-486-2048. Medicare representatives can process your disenrollment over the phone and confirm your effective date. This is often the fastest route if you have questions.
- Use Medicare.gov: Log into your account at Medicare.gov, go to "Change Plans," select your current plan, and follow the prompts to disenroll. You will see your effective date before you confirm.
- Contact your plan directly: Call the customer service number on your plan card or in your plan documents and ask for a disenrollment form. Mail it back or submit it online according to your plan's instructions. Keep a copy for your records.
Whichever route you choose, do it early in the enrollment window. If you wait until the last day and your request is lost or delayed, you may miss the important date and have to wait for the next window.
What happens to your coverage on the switch date
Your Medicare Advantage plan ends on the last day of the month in which you disenroll (or on the date specified in your disenrollment notice). Your new coverage — whether Original Medicare, a different Advantage plan, or Medigap — begins the first day of the following month, or when ready in some Special Enrollment situations.
During the gap between plans, you are still covered by Medicare. If you need care on the day your Advantage plan ends, call your current plan's customer service to confirm whether they will cover it. Most plans cover emergency and urgent care through the end of the month even after you have disenrolled.
If you are switching to Original Medicare, you may want to enroll in a Medigap plan or a Part D prescription drug plan at the same time. Medigap enrollment has its own important date, so do not delay if you are interested. If you are switching to another Advantage plan, that plan's coverage begins automatically on the first day of the month after your current plan ends.
What to do before you disenroll
Before you submit a disenrollment request, confirm that your new plan or Original Medicare will cover your doctors and medications. Call your current plan's customer service and ask for a list of in-network providers, or visit the plan's website. Then call your doctors' offices and ask whether they accept your new plan or Original Medicare.
If you are switching to Original Medicare, check whether your current medications are covered under Medicare Part D, and whether your doctors accept Medicare. If you are switching to a different Advantage plan, verify that your doctors are in that plan's network and that your medications are on the plan's formulary (the list of covered drugs).
Also check whether you need to disenroll from any supplemental coverage. If you have a Medigap plan alongside your Advantage plan (which is not common but does happen), you may need to cancel it when you switch. Ask your Medigap insurer whether your policy will continue or end.
Frequently Asked Questions
Can I switch back to my old Medicare Advantage plan if I change my mind?
Once you disenroll, you cannot rejoin the same plan until the next Annual Enrollment Period in October, unless you have a may have access to Special Enrollment Period. If you realize within a few days that you made a mistake, call Medicare when ready — in rare cases, they may be able to reverse a disenrollment if it was submitted in error.
What if my doctor leaves my plan's network after I have already disenrolled?
If your new plan's doctor leaves the network after you switch, that is a may have access to event for a Special Enrollment Period. Contact Medicare at 1-800-MEDICARE to report the change and ask whether you can switch plans outside the regular enrollment windows.
Do I have to disenroll from Part D when I leave my Medicare Advantage plan?
Medicare Advantage plans include prescription drug coverage (Part D), so when you disenroll from the Advantage plan, your Part D coverage through that plan ends. If you are switching to Original Medicare, you will need to enroll in a standalone Part D plan during the same enrollment window, or you may face a late enrollment penalty.
What happens if I miss the disenrollment important date?
If you miss the Annual Enrollment Period and do not have a may have access to Special Enrollment Period, you are locked into your current Medicare Advantage plan until the next October. The only exception is if you move out of your plan's service area, which opens a Special Enrollment Period regardless of the calendar date.
Can I disenroll if my plan is being discontinued?
Yes. If your Medicare Advantage plan is being discontinued, Medicare sends you a notice and opens a Special Enrollment Period. You can switch to any other plan or to Original Medicare during this period, and the effective date is usually the first day of the month after the plan ends.