Medicare Advantage works well for a lot of people. For others, the network is too narrow, or the prior authorizations are too much, or a hospital they need is suddenly out of network. The good news is you can switch back to Original Medicare. The catch is the timing.
Yes, you can switch back
If you joined a Medicare Advantage plan and it is not working out, you have a few chances each year to switch back to Original Medicare. You do not need to give a reason. You just have to use the right window.
The trickier part is what happens with Medigap. Switching back to Original Medicare is easy. Buying a good Medigap plan to go with it is sometimes not.
The two windows to switch back
1. Annual Enrollment Period (October 15 to December 7)
This is the main window. Anyone on a Medicare Advantage plan can use it to switch back to Original Medicare. You also use AEP to pick a stand-alone Part D drug plan, since Original Medicare does not include drug coverage. The change takes effect January 1.
Our full AEP 2026 guide covers this window in detail.
2. Medicare Advantage Open Enrollment Period (January 1 to March 31)
This window is only for people who are already on a Medicare Advantage plan on January 1. You get one switch. You can change to a different Medicare Advantage plan, or you can drop back to Original Medicare and add a Part D plan. The change takes effect the first of the month after you enroll.
If you switch back to Original Medicare during this window, your new coverage starts the first of the month after Medicare gets your request.
What about Special Enrollment Periods?
Big life events can also give you a window to switch. Moving outside your plan's service area, qualifying for Medicaid, or your plan leaving Medicare are common triggers. See our Special Enrollment Periods guide for the full list.
The Medigap problem
This is where switching back gets tricky. Original Medicare covers about 80% of your medical costs. The other 20% is on you, with no out-of-pocket cap. Most people on Original Medicare buy a Medigap plan to fill that 20% gap.
The problem is that Medigap is not part of Medicare. It is a separate insurance product sold by private companies. In most states, after your initial 6-month Medigap Open Enrollment Period at 65, the carrier can ask health questions and decide whether to insure you. If your health has changed since you first got Medicare, you might be denied a Medigap plan, or charged a much higher rate.
The trial right
If you first joined a Medicare Advantage plan when you became eligible for Medicare, the law gives you 12 months to try it. If you leave during that first year, you have a guaranteed right to buy certain Medigap plans without medical underwriting. The carrier cannot say no, and the rate is based on your age and zip code, not your health.
This is one of the most important protections in Medicare, and most people do not know it exists. If you joined Medicare Advantage at 65 and want to switch back, do it before your one-year mark and the door to Medigap stays open.
Other guaranteed issue situations
A few other situations give you a guaranteed right to buy Medigap without underwriting. These vary by state, but federal law guarantees at least these:
- Your Medicare Advantage plan ends its contract with Medicare
- Your Medicare Advantage plan stops doing business in your area
- You move outside your Medicare Advantage plan's service area
- Your employer retiree plan ends
- Your Medigap insurance company goes bankrupt
- You leave a Medicare Advantage plan because the company misled you or violated its rules
Some states (like California, New York, Connecticut, Maine, Massachusetts, Washington, Oregon, and a handful of others) have extra rules that make it easier to buy Medigap with no underwriting.
Step-by-step: how to switch back
- Pick your timing. Use AEP, MA Open Enrollment, or a SEP. Mark the date.
- Apply for Medigap first if you can. Get your Medigap policy approved before you cancel Medicare Advantage. That way you do not end up on Original Medicare with no supplement.
- Sign up for a Part D drug plan. Original Medicare does not cover prescriptions. You need a stand-alone Part D plan, unless you have other drug coverage (like from the VA).
- Drop your Medicare Advantage plan. You can call Medicare at 1-800-MEDICARE to disenroll. You can also just enroll in a stand-alone Part D plan, which automatically drops your Medicare Advantage plan.
- Watch the calendar. Your new coverage starts the first of the next month (for MA Open Enrollment and SEPs) or January 1 (for AEP).
- Keep your old plan ID card until your new coverage starts. Then put it away.
What if you cannot get Medigap?
If medical underwriting is going to keep you out of Medigap, you have a few choices. You can stay on Medicare Advantage and pick a better one that fits you. You can go to Original Medicare without a supplement, which means full out-of-pocket exposure on the 20% (rare, but some people do this). Or you can look at a Medicare Advantage plan that better matches your needs (a different network, a different formulary, a lower max out-of-pocket).
Most people who want to leave Medicare Advantage but cannot get Medigap end up shopping their MA options instead. That works fine as long as you find a plan that has your doctors, your drugs, and a max out-of-pocket you can live with.
The bottom line
Switching from Medicare Advantage to Original Medicare is technically easy. The real question is what happens with Medigap. If you are healthy, or if you are in your trial year, switching back is straightforward. If your health has changed since you turned 65, you may need to think harder about whether to go back or to find a better Medicare Advantage plan. Either way, do not assume you are stuck. There is almost always a better option.