If you’re on a Medicare Advantage plan and thinking about leaving, you’re not alone. Every year, millions of people switch from Medicare Advantage back to Original Medicare — and many of them pick up a Medicare Supplement plan (also called Medigap) to cover the gaps.
But whether you can switch and whether you should switch are two different questions. And the timing matters more than most people realize.
Here’s what you need to know.
Yes, you can switch from Medicare Advantage to a Supplement — but the “when” matters
There is no rule that says you’re locked into Medicare Advantage forever. You can leave your plan and return to Original Medicare. The question is whether you can get a Medicare Supplement plan once you do — and that depends entirely on when you make the switch and what state you live in.
Medicare Supplement plans are medically underwritten in most states. That means the insurance company can ask about your health history, and they can charge you more — or deny you coverage — based on your answers. If you have diabetes, heart disease, cancer history, or other conditions, this is a real risk.
There are only a few situations where insurance companies are required to sell you a Supplement plan regardless of your health. These are called guaranteed-issue rights, and the most important one is the 12-month trial right.
The 12-month trial right: your one guaranteed window
If you signed up for a Medicare Advantage plan when you were first eligible for Medicare — meaning it was your first time enrolling, typically when you turned 65 — you have a one-time, 12-month window called the trial right.
During this window, you can drop your Medicare Advantage plan, go back to Original Medicare, and enroll in a Medicare Supplement plan with no health questions asked. No medical underwriting. No risk of being turned down. Guaranteed acceptance.
The 12-month clock starts on the day your Medicare Advantage coverage begins. Once it runs out, most states do not give you another opportunity like this.
This is the single most important thing to understand if you’re new to Medicare and chose an Advantage plan. Your window is finite, and in most states, it doesn’t come back.
What if your 12-month window has already closed?
If you’ve been on Medicare Advantage for more than 12 months, your options depend on your state and your health.
In most states, you would need to apply for a Medicare Supplement plan and go through medical underwriting. If you’re healthy, you’ll likely qualify. If you have significant health conditions, you could be denied or charged a higher premium.
A few states offer protections beyond the trial right. New York has continuous open enrollment for Supplement plans — you can switch at any time, any year, with guaranteed issue. Connecticut offers similar protections. Some states have a birthday rule that gives you an annual window around your birthday to switch Supplement plans (though most birthday rules only apply if you already have a Supplement, not if you’re switching from Advantage).
There are other guaranteed-issue situations that apply regardless of your state. If your Medicare Advantage plan leaves your area, goes out of business, or you move out of the plan’s service area, you may have guaranteed-issue rights to purchase a Supplement. If your plan loses its Medicare contract, same thing. These are less common but worth knowing about.
The actual steps to switch from Medicare Advantage to a Supplement
If you decide to make the switch, here’s what the process looks like.
Step 1: Apply for a Medicare Supplement plan. You can do this while still enrolled in your Advantage plan. An independent Medicare advisor can compare plans from every carrier in your area and help you pick the one that fits your needs and budget.
Step 2: Once you’re approved and your Supplement coverage is confirmed, disenroll from your Medicare Advantage plan. You can do this by calling Medicare directly at 1-800-MEDICARE, or by calling your Advantage plan to request disenrollment. You can also disenroll through Medicare.gov.
Step 3: Your Original Medicare coverage resumes. You’ll go back to using your red, white, and blue Medicare card. Your Supplement plan kicks in to cover the 20% coinsurance, hospital deductibles, and other costs that Original Medicare doesn’t pay.
Step 4: Enroll in a standalone Part D prescription drug plan if your Supplement plan doesn’t include drug coverage (most don’t). You’ll have a guaranteed right to join a Part D plan when you leave your Advantage plan.
The entire process typically takes 2-4 weeks. An advisor can walk you through each step so nothing falls through the cracks.
When can you actually disenroll from Medicare Advantage?
There are specific times during the year when you can leave your Medicare Advantage plan.
Medicare Advantage Open Enrollment Period (January 1 – March 31): During this window, you can drop your Advantage plan and return to Original Medicare. This is the most common time people make the switch.
Annual Enrollment Period (October 15 – December 7): You can switch from Advantage back to Original Medicare, effective January 1 of the following year.
Special Enrollment Periods: If you have a qualifying life event — like moving out of your plan’s service area, losing employer coverage, or your plan leaving your area — you may be able to disenroll outside the standard windows.
12-month trial right: If you’re within your first 12 months on Medicare Advantage, you can switch at any time during that window.
The important thing to understand is that being able to leave Medicare Advantage and being able to get a Supplement plan are two separate things. You can always leave Advantage during the enrollment periods above. But getting a Supplement plan with guaranteed issue is only available during specific windows — and the trial right is the biggest one.
Should you switch? Honest pros and cons
Switching from Medicare Advantage to a Supplement plan is a significant decision. Here’s an honest look at both sides.
Reasons to consider switching:
Your doctors keep leaving the network, or the network changed and your preferred providers are no longer covered. You’ve had claims denied due to prior authorization requirements. Your out-of-pocket costs are higher than expected despite a low or zero premium. You want the freedom to see any doctor in the country who accepts Medicare without referrals, network restrictions, or prior authorization. You want predictable costs — a fixed monthly premium with little to no surprise bills.
Reasons to stay on Medicare Advantage:
You’re happy with your plan and your doctors are in-network. You use the extra benefits like dental, vision, hearing, and fitness programs. Your health care costs have been low and predictable. You don’t travel often or split time between states. The $0 premium works well for your budget and you haven’t had issues with coverage denials.
There’s no universally right answer. It depends on your health, your doctors, your prescriptions, where you live, and how you use healthcare. The best thing you can do is get an honest comparison before your options narrow.
Why timing is everything
The hardest part about this decision is that the best time to switch is when you feel like you don’t need to. If you’re healthy and your Advantage plan is working fine in year one, it’s tempting to stay. But that’s exactly the window when you have guaranteed-issue rights to get a Supplement plan.
By year two, three, or five — if your health has changed, or your plan has changed, or your doctors have left the network — you might desperately want a Supplement plan. But now you’d need to pass medical underwriting to get one. And depending on your health at that point, you might not qualify.
This is why the 12-month trial right exists. It’s designed to give you a risk-free chance to try Medicare Advantage and switch to a Supplement if it’s not the right fit — without your health being held against you.
How I can help
I’m Cindy Kowalski, a licensed independent Medicare advisor. I don’t work for any insurance company, which means I compare plans from every major carrier and give you an honest recommendation based on your situation — not based on which plan pays me the most.
If you’re thinking about switching from Medicare Advantage to a Supplement plan, I can help you understand where you are in your window, compare every plan available in your ZIP code, verify your doctors and prescriptions, and walk you through the process step by step.
The consultation is free. Carriers pay me when someone enrolls, so there’s never a cost to you. And if staying on your current plan is the best move, I’ll tell you that too.
Book a free 30-minute Medicare plan review →
Or call me directly: (352) 464-4400
Cindy Kowalski · Licensed Independent Medicare Advisor · Eligry LLC · NPN 21601670
We do not offer every plan available in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options. Not affiliated with or endorsed by the U.S. government or the federal Medicare program.