How to Disenroll From Medicare Advantage: A Step-by-Step Guide for 2026

This article is for general educational purposes only and is not insurance or medical advice. We are not affiliated with the U.S. government or Medicare. For official information, visit Medicare.gov or call 1-800-MEDICARE. See our Medical & Financial Disclaimer for details.

Leaving a Medicare Advantage plan and returning to Original Medicare is more common than people expect. Costs that added up faster than the brochure suggested, a specialist who left the network, or simply wanting to stop checking whether a doctor is in or out are all ordinary reasons. The paperwork is easier than most guides make it sound — easier, in fact, than the article you are probably reading elsewhere, because in the most common case there is no disenrollment form at all. What is genuinely hard is one thing, and it has to happen before you do anything else.

The Quick Answer

• There is no penalty from the Centers for Medicare & Medicaid Services (CMS) for leaving Medicare Advantage during a valid window, and your Part A and Part B keep running throughout
• If you’re returning to Original Medicare and joining a standalone drug plan, Medicare states you don’t need to contact your Medicare Advantage plan at all — joining the drug plan disenrolls you automatically
• The real risk is Medigap: outside specific guaranteed-issue situations, insurers in most states can underwrite your application and decline it
• Which means the correct order is Medigap first, disenrollment second — not the other way around

First, the Part That Can’t Be Undone: Medigap

Most guides put this at step four. It belongs at step zero, because it’s the only part of this process that can fail permanently.

Original Medicare has no annual cap on what you pay. You are responsible for 20% coinsurance on most Part B services with no ceiling, which is precisely why most people who return to Original Medicare pair it with a Medicare Supplement (Medigap) policy. Leaving Medicare Advantage is easy. Getting the Medigap policy that makes Original Medicare safe to live with is not guaranteed.

Medicare’s guide to buying a Medigap policy is direct about it: once your Medigap Open Enrollment Period ends, insurance companies don’t have to sell you a policy unless you have guaranteed issue rights. In most states that means medical underwriting: they look at your health history, and they can charge more or say no. Our guide to Medigap with pre-existing conditions goes through how that underwriting actually works and what it looks at.

The two trial rights, and who actually has one

Federal law carves out two narrow exceptions, both set out in Medicare’s guide to choosing a Medigap policy. The first covers someone who joined a Medicare Advantage plan or PACE when they were first eligible for Medicare at 65 and decides within that first year to switch to Original Medicare — they can buy any Medigap policy sold in their state. The second covers someone who dropped a Medigap policy to join a Medicare Advantage plan for the first time, has been in the plan less than a year, and wants the Medigap policy back.

Both carry a twelve-month clock and both require it to be the first time. If you have been in Medicare Advantage for four years, neither applies to you, and that guide lists no guaranteed issue right for your situation. Medicare’s own booklet on understanding Medicare Advantage plans adds a related warning worth reading twice: in most cases, if you dropped your Medigap policy to join a Medicare Advantage plan, you may not be able to get the same policy back.

Some states go further than federal law and give residents additional guaranteed-issue opportunities. Your State Health Insurance Assistance Program will tell you whether yours is one of them, free of charge, and that call is worth making before anything else in this article.

What this means in practice

Apply for the Medigap policy and get a written acceptance before you set your disenrollment in motion. Done in that order, a refusal costs you nothing — you simply stay where you are and think again. Done in the other order, you can find yourself successfully out of Medicare Advantage, declined for Medigap, and holding Original Medicare with no out-of-pocket ceiling, with January 1 arriving regardless.

Confirm You’re in a Valid Window

You can’t leave whenever you like. These are the openings:

Window	When	Who it’s for	Coverage starts
Annual Enrollment Period	Oct 15 – Dec 7	Anyone with Medicare	January 1
Medicare Advantage Open Enrollment	Jan 1 – Mar 31	Already in a Medicare Advantage plan. One change only	First of the month after the plan gets your request
12-month right to drop	Within 12 months of joining	Joined Medicare Advantage when first eligible at 65	First of the month after your request
Special Enrollment Period	When the event happens	Moving, losing other coverage, network changes and similar	Usually first of the following month

The one-change limit on the January window is real and trips people up — Medicare’s guide to enrollment periods states you can only make one change each year during it. There is no correcting a rushed decision in February.

The third row is the one people miss. Medicare’s list of Special Enrollment Periods confirms that if you joined a Medicare Advantage plan when first eligible at 65, your chance to drop it lasts a full twelve months from joining — and you’ll have special rights to buy a Medigap policy for a limited time. If that’s you, this is not merely a window. It’s the only route out that comes with the Medigap protection attached.

The Disenrollment Itself, Which Is Probably Nothing

Here is where most guides send you chasing a form you don’t need. Medicare’s booklet on understanding Medicare Advantage plans says it plainly: if you’re returning to Original Medicare and joining a separate Medicare drug plan, you don’t need to contact your Medicare Advantage plan to disenroll — the disenrollment happens automatically when you join the drug plan.

So for most people leaving Medicare Advantage, the entire administrative act is joining a Part D plan. The exit takes care of itself. Submitting a separate disenrollment request on top of that isn’t diligence, it’s an extra moving part in a process that didn’t need one.

There is one case where you do have to do something: if you’re returning to Original Medicare and not joining a drug plan. Then contact your plan or call 1-800-MEDICARE (1-800-633-4227) and ask them to process the disenrollment. Think hard before choosing that route, though — see the penalty note below.

Whichever applies, ask for the effective date in writing and note who you spoke to. If nothing has arrived by the time the month turns, 1-800-MEDICARE can tell you what is actually recorded against your Medicare number — a call worth making before that date rather than after it.

What You Have to Replace Yourself

Your Part A and Part B continue without interruption. What doesn’t continue is everything your Medicare Advantage plan had bundled around them.

What the plan gave you	Original Medicare alone	What you do about it
Prescription drug coverage	Doesn’t cover most outpatient prescriptions	Join a standalone Part D plan — and this is also what triggers your disenrollment
An annual out-of-pocket maximum	No cap at all on your 20% coinsurance	A Medigap policy — which is why it goes first
Dental, vision, hearing, fitness	Not covered	Separate policies, or go without

The penalty nobody mentions. There’s no penalty for leaving Medicare Advantage. There is one for going without drug coverage. Medicare’s page on avoiding late enrollment penalties sets the Part D penalty at 1% of the national base beneficiary premium for each month you went without creditable coverage, and it’s added to your premium for as long as you have Part D. Dropping a Medicare Advantage plan that included drug coverage and not replacing it starts that meter running. If you take no medications today, that can feel like a reasonable way to save. The penalty is permanent and your prescriptions at 80 are not your prescriptions at 66.

Before the Effective Date, Check These

1. Your Medigap acceptance is in writing, and its start date lines up with the day your Medicare Advantage plan ends
2. Your Part D plan is active from the same date, with no month uncovered in between
3. Every medication you take appears on that plan’s formulary, checked by name and dose rather than assumed
4. Your Medicare Advantage plan shows as ending on the date you expect, confirmed with 1-800-MEDICARE rather than inferred from silence
5. You’ve kept every confirmation number and the date of each call, because reconstructing the timeline from memory is what makes a correction hard months later

Why People Leave

The reasons cluster into two kinds. The first is cost that arrived differently than expected: copays that added up past what the premium saved, or a hospital stay that revealed how much of the out-of-pocket maximum was actually reachable. The second is friction — a doctor or specialist who left the network, prior authorization denials for care that was needed, or the accumulated cost of having to check whether each new provider is in or out.

Travel is a quieter third reason. Network-based plans and spending several months a year in another state tend not to coexist comfortably, and people often discover this only after the first year.

None of these is a bad reason. But notice that all of them are discovered by using the plan, which is usually well past the twelve-month trial right. That timing is the whole problem, and it’s why the Medigap question has to be settled before the rest.

Frequently Asked Questions

Is there a penalty for leaving Medicare Advantage? No. There’s no CMS penalty for returning to Original Medicare during a valid window. The penalty risk is a different one: going without creditable drug coverage afterward.

Do I have to fill out a disenrollment form? Usually not. If you’re going back to Original Medicare and joining a standalone drug plan, Medicare says joining that drug plan disenrolls you automatically and you don’t need to contact your Medicare Advantage plan. Only if you’re not joining a drug plan do you need to contact the plan or 1-800-MEDICARE directly.

Will there be a gap in my coverage? Not in Part A and Part B, which continue without interruption. Gaps happen in the pieces you’re replacing yourself — a Part D plan or Medigap policy starting later than your Medicare Advantage plan ends.

What’s the single biggest mistake people make? Disenrolling first and applying for Medigap afterward. Outside a trial right, most states let insurers underwrite and decline the application — and by then you’ve already left.

I’ve been in Medicare Advantage for six years. Can I still get Medigap? Possibly, but not by right. You’re outside both federal trial rights, so in most states the insurer can underwrite your application. Some states grant broader rights than federal law requires — ask your State Health Insurance Assistance Program before you commit to anything.

Bottom Line

The disenrollment is the easy part, and for most people it isn’t even a separate step — joining a Part D plan does it automatically. Your Part A and Part B never stop.

Everything difficult is on the other side of the door. Original Medicare without Medigap has no ceiling on what you can be asked to pay, and Medigap is only guaranteed to you inside two narrow twelve-month trial rights that most people leaving Medicare Advantage have long since passed. So the order matters more than the paperwork: settle the Medigap question, in writing, and let the disenrollment be the last thing that happens rather than the first.

For free, unbiased help with any of this, call 1-800-MEDICARE or your local State Health Insurance Assistance Program (SHIP), and compare Part D and Medigap options with the official Medicare Plan Finder.

Sources

• Understanding Medicare Advantage Plans — Medicare.gov. Source for disenrollment happening automatically when you join a separate drug plan, and for the warning that you may not be able to get the same Medigap policy back.
• Choosing a Medigap Policy: A Guide to Health Insurance for People with Medicare — Medicare.gov. Source for the two 12-month trial rights and the absence of a guaranteed issue right for long-term Medicare Advantage enrollees.
• Buying a Medigap policy — Medicare.gov. Source for insurers not having to sell you a Medigap policy once your Medigap Open Enrollment Period ends.
• Special Enrollment Periods — Medicare.gov. Source for the 12-month right to drop a first Medicare Advantage plan joined at 65 and the Medigap rights attached to it.
• Understanding Medicare Advantage & Medicare Drug Plan Enrollment Periods — Medicare.gov. Source for the one-change limit during the January 1 – March 31 window.
• Avoid late enrollment penalties — Medicare.gov. Source for the Part D penalty of 1% per month without creditable drug coverage.

All rules on this page were checked against the sources above on September 16, 2026.

Disclaimer: Enrollment rules, windows, and guaranteed-issue protections mentioned in this article reflect 2026 guidelines from the Centers for Medicare & Medicaid Services (CMS) and vary by state. Always confirm current details directly with Medicare.gov, 1-800-MEDICARE, or a licensed agent before making a decision.