You can switch back to Original Medicare during specific windows, but the timing and rules depend on when you enrolled in Medicare Advantage

If you are in a Medicare Advantage plan and want to return to Original Medicare (also called Traditional Medicare), you have three main windows to do it: the Annual Enrollment Period, the Medicare Advantage Open Enrollment Period, or a Special Enrollment Period if a may have access to event has happened. The process itself is straightforward — you contact Medicare or your new Medigap insurer — but missing the window means you may be locked in your current plan for a full year, or face a late enrollment penalty when you do switch.

The key difference between these windows is timing and what you can do. The Annual Enrollment Period runs October 15 to December 7 each year and lets you switch to Original Medicare or to a different Medicare Advantage plan. The Medicare Advantage Open Enrollment Period (January 1 to March 31) lets you switch to Original Medicare only, not to another Advantage plan. A Special Enrollment Period opens if you move out of your plan's service area, lose employer coverage, or experience other specific life changes — and the window is usually 60 days.

Key Takeaways

  • The Annual Enrollment Period (October 15 to December 7) is the main window to switch back to Original Medicare, and your coverage starts January 1.
  • If you miss the Annual Enrollment Period, the Medicare Advantage Open Enrollment Period (January 1 to March 31) lets you switch to Original Medicare only, with coverage starting the first of the following month.
  • You must enroll in a Medigap or Medicare Part D plan at the same time you switch to Original Medicare, or you will have gaps in coverage and may face higher premiums later.
  • Contact Medicare directly at 1-800-MEDICARE or through Medicare.gov to make the switch; do not rely on your current plan to process the request.
  • If you switch during the wrong window, you may be locked into your current plan for the rest of the year or face a permanent penalty on your Part B or Part D premiums.

The Annual Enrollment Period: October 15 to December 7

The Annual Enrollment Period is the main opportunity to switch back to Original Medicare. It runs from October 15 through December 7 each year, and any change you make during this window takes effect on January 1 of the following year. This is the only window where you can switch to Original Medicare, switch to a different Medicare Advantage plan, or change your Part D prescription drug plan all in the same enrollment period.

To switch during this window, contact Medicare directly by calling 1-800-MEDICARE (1-800-633-4227), visiting Medicare.gov, or using the Medicare app. You will need your Medicare number (on your red, white, and blue Medicare card) and information about the Original Medicare plan you want to join. If you are switching to Original Medicare, you must also enroll in a Medigap supplemental plan or a Medicare Part D prescription drug plan at the same time — Original Medicare does not cover all costs, and waiting to enroll in these later will result in higher premiums.

The coverage start date of January 1 is automatic; you do not need to do anything else. Your Medicare Advantage plan will end on December 31, and Original Medicare begins the next day. Make sure you receive confirmation from Medicare in writing before January 1 to verify the switch went through.

The Medicare Advantage Open Enrollment Period: January 1 to March 31

If you miss the Annual Enrollment Period, you have a second chance during the Medicare Advantage Open Enrollment Period, which runs January 1 through March 31 each year. However, this window is more limited: you can switch to Original Medicare or to a different Medicare Advantage plan, but you cannot change your Part D prescription drug plan during this period.

The process is the same — call 1-800-MEDICARE, visit Medicare.gov, or use the Medicare app — but the coverage start date is different. Any switch made during this window takes effect on the first day of the month after you make the change. For example, if you request the switch on February 15, your Original Medicare coverage begins March 1. This means you may have a gap of a few weeks where you are still in your Medicare Advantage plan, so plan accordingly if you have upcoming medical appointments.

As with the Annual Enrollment Period, you must enroll in a Medigap or Part D plan when you switch to Original Medicare. If you already have a Part D plan from your Medicare Advantage coverage, that plan ends when your Advantage plan ends, so you will need to choose a new standalone Part D plan during the Annual Enrollment Period (October 15 to December 7) or wait until the next Annual Enrollment Period if you switch during the Advantage Open Enrollment Period.

Special Enrollment Periods: When You may have access to Outside the Main Windows

A Special Enrollment Period opens if certain life events happen, allowing you to switch to Original Medicare outside the regular enrollment windows. may have access to events include moving out of your Medicare Advantage plan's service area, losing employer-sponsored coverage, losing Medicaid, experiencing a death in your household, or having your plan terminate. Some plans also trigger a Special Enrollment Period if they significantly change their benefits or raise premiums substantially.

When a may have access to event occurs, you typically have 60 days from the date of the event to request a switch. For example, if you move out of your plan's service area on March 15, you have until May 14 to switch. The coverage start date depends on when you make the request and which event triggered the period — some changes take effect the first of the following month, while others take effect when ready.

To use a Special Enrollment Period, call 1-800-MEDICARE and explain the may have access to event. Medicare will ask for documentation — a lease or utility bill for a move, a notice from your employer for loss of coverage, or a death certificate for a household death. Keep this documentation handy. You will also need to enroll in a Medigap or Part D plan at the same time you switch to Original Medicare.

Enrolling in Medigap or Part D When You Switch

Original Medicare covers roughly 80 percent of approved medical costs after you meet your deductible. The remaining 20 percent is your responsibility, which is why you need either a Medigap supplemental plan or a Medicare Part D prescription drug plan (or both) when you switch. Medigap covers the gaps in Original Medicare — copayments, coinsurance, and deductibles. Part D covers prescription drugs. Many people carry both.

If you are switching during the Annual Enrollment Period (October 15 to December 7), you can enroll in a Medigap plan and a Part D plan at the same time, and both will start January 1 along with your Original Medicare coverage. Contact Medigap insurers directly — they are sold by private insurance companies, not by Medicare — or use the Medicare Plan Finder tool at Medicare.gov to compare plans and see which insurers offer coverage in your area.

If you are switching during the Medicare Advantage Open Enrollment Period (January 1 to March 31), you can enroll in a Medigap plan when ready, but you cannot enroll in a new Part D plan until the next Annual Enrollment Period. If your current Medicare Advantage plan includes prescription drug coverage, that coverage ends when your plan ends, leaving you without drug coverage until the next Annual Enrollment Period. To avoid this gap, consider waiting to switch until the Annual Enrollment Period if you take regular medications.

There is a penalty for late enrollment in Part D: if you go 63 days or more without creditable drug coverage, Medicare adds 1 percent to your Part D premium for each month you were without coverage, and this penalty lasts as long as you have Part D. Medigap does not have a late enrollment penalty, but some insurers may deny you coverage or charge higher premiums if you have pre-existing conditions and you explore outside of certain windows.

What Happens to Your Medicare Advantage Plan When You Switch

When your switch to Original Medicare takes effect, your Medicare Advantage plan automatically ends on the last day of the previous month. You do not need to contact your current plan to cancel — Medicare handles the termination. However, it is a good idea to confirm that your plan has ended by checking your Medicare account at Medicare.gov or calling 1-800-MEDICARE a few days after your switch date.

If you have any remaining benefits from your Medicare Advantage plan — such as dental or vision coverage — those end when your plan ends. Original Medicare does not include dental, vision, or hearing coverage, so if these services are important to you, look for standalone dental and vision plans or a Medigap plan that offers them. Some Medigap plans include limited vision or dental benefits, though most do not.

If you have a prescription that your Medicare Advantage plan was covering, make sure your new Part D plan covers that drug before your Advantage plan ends. If it does not, you may be able to request an exception from your new Part D plan, or you may need to switch to a different Part D plan during the next Annual Enrollment Period. Do not wait until your Advantage plan ends to check — contact your new Part D plan at least two weeks before the switch date.

Common Mistakes to Avoid When Switching

The most common mistake is missing the enrollment window and being locked into your current plan for a full year. Mark the dates on your calendar: October 15 to December 7 for the Annual Enrollment Period, and January 1 to March 31 for the Medicare Advantage Open Enrollment Period. If you think a Special Enrollment Period applies to you, contact Medicare when ready — the 60-day clock starts from the date of the may have access to event, not from the date you realize you may have access to.

A second mistake is switching to Original Medicare without enrolling in a Medigap or Part D plan. If you do this, you will have gaps in coverage and will face higher premiums when you eventually enroll. Part D penalties are permanent, so do not delay. Enroll in these plans at the same time you request the switch to Original Medicare.

A third mistake is contacting your current Medicare Advantage plan to request the switch instead of contacting Medicare directly. Your plan has no incentive to process your request quickly or accurately, and some plans deliberately slow-walk the paperwork. Always contact Medicare at 1-800-MEDICARE or Medicare.gov to make the switch yourself.

Finally, do not assume your new Medigap or Part D plan will coordinate with your switch automatically. Call your new insurer a few days after your switch date to confirm they received your enrollment and that coverage started on the correct date. If there is a gap or an error, contact Medicare when ready to fix it.

Frequently Asked Questions

Can I switch back to Original Medicare if I have not been in Medicare Advantage for a full year?

Yes. There is no minimum time you must stay in a Medicare Advantage plan. You can switch during any enrollment period — Annual, Advantage Open, or Special — regardless of how long you have been enrolled. However, if you switch outside an open enrollment window without a may have access to event, you will be locked in your current plan for the rest of the year.

What if my Medicare Advantage plan is being discontinued?

If your plan terminates, Medicare automatically sends you a notice at least 30 days before the end date. You will have a Special Enrollment Period to switch to Original Medicare or another Medicare Advantage plan. The coverage start date is usually the first day of the month after your current plan ends. Contact Medicare as soon as you receive the notice to avoid gaps in coverage.

Do I lose my doctor if I switch back to Original Medicare?

Not automatically. Original Medicare is accepted by most doctors and hospitals nationwide, so you may be able to keep your current providers. However, call your doctor's office to confirm they accept Original Medicare and that they are still in your area. Some doctors may have changed their practices or retired since you joined your Medicare Advantage plan.

Can I switch back to Original Medicare and then back to Medicare Advantage later?

Yes, but only during an open enrollment period. You can switch between Original Medicare and Medicare Advantage as many times as you want, as long as you do it during the Annual Enrollment Period (October 15 to December 7) or a Special Enrollment Period. The Medicare Advantage Open Enrollment Period (January 1 to March 31) only lets you switch to Original Medicare, not back to Advantage.

What if I switch to Original Medicare and then realize I made a mistake?

If you switch during the Annual Enrollment Period and realize within a few days that you made a mistake, contact Medicare when ready at 1-800-MEDICARE. Medicare may be able to reverse the switch if it has not yet taken effect. If the switch has already taken effect, you will need to wait until the next enrollment period to change plans again, unless a Special Enrollment Period applies to your situation.