Switching from Medicare Advantage to Medigap has a hidden step
Switching from Medicare Advantage to Medigap is two decisions, not one. Only four states make insurers accept you regardless of health history.
In This Article
Your Medicare Advantage plan raised costs, dropped your specialist, or denied a prior authorization, and you want out. Leaving is easy. Buying a Medigap policy afterward is a separate decision, and an insurer may say no.
Start where your situation fits:
- Within your first 12 months in Medicare Advantage, you probably have a protected right.
- Your plan is leaving your area, or you moved away. Same protection.
- Neither applies, so medical underwriting decides. The final sections matter most.
Medigap adds a sixth bill to the five separate bills Medicare already sends.
ℹ️ Financial Disclaimer: This article is general education about insurance, credit, lending, tax and investment topics, not personalized advice for your situation. Medigap eligibility, pricing and state protections vary by insurer and by state, and nothing here is a prediction that any particular application will be approved or declined. Before acting, consult a state-licensed insurance agent, a free State Health Insurance Assistance Program counselor, a fiduciary advisor, a CPA, or a qualified attorney, as your circumstances require.
Leaving a plan and buying a policy are two different rules
You can leave Medicare Advantage during two annual windows, but leaving does not entitle you to a Medigap policy.
Two windows let you leave Medicare Advantage
Medicare Open Enrollment runs October 15 to December 7. Current enrollees get one more change, January 1 to March 31, during the Medicare Advantage Open Enrollment Period, returning to Original Medicare.
Neither window makes an insurer accept you
Those dates govern your plan only. Medigap is sold separately, under its own rules, and cannot pair with one.
🔍 How It Works: Your Medigap Open Enrollment Period is a one-time, six-month window opening the first month you are 65 and enrolled in Part B. Inside it, no insurer may ask a health question. Outside it, Medicare says companies may deny you.
When an insurer must accept you anyway
Federal law forces insurers to sell at standard rates in four situations, called guaranteed issue rights.
| Your situation | What you can buy |
|---|---|
| Joined Medicare Advantage when first eligible, leaving within 12 months | Any policy sold in your state |
| Dropped Medigap to try Medicare Advantage, returning within 12 months | Old policy, or Plans A–D, F, G, K, L |
| Plan leaves Medicare or your area, you move, or it misled you | Plans A–D, F, G, K, L |
Source: Medicare’s own eligibility guidance, verified September 2026.
The trial right, and why there are two of them
One trial right belongs to people who chose Medicare Advantage when first eligible. A second belongs to anyone who dropped Medigap to try it, at any age.
The window: 60 days before, 63 days after
Apply up to 60 days before coverage ends and no later than 63 days after, and only if you return to Original Medicare. Part B enrollment starts the clock.
✅ Action Step: Before cancelling, ask your State Health Insurance Assistance Program: given my disenrollment date and state, do I have a guaranteed issue right, and which plan letters?
How many people this actually affects
If no row above describes you, you are in the majority, not an exception.
Nine in ten enrollees have no federal path
📊 Data Point: 90% of Medicare Advantage enrollees aged 65 and older, or 22.4 million people, have no guaranteed issue protection to buy Medigap outside the trial period. Source: KFF analysis of CMS data, 2022, in a brief updated February 2026.
Where you live decides more than you expect
Medicare Advantage covers 55% of eligible beneficiaries, 35.2 million of 64.2 million, KFF reported in June 2026. Only 10% of enrollees 65 and older live in the four states with broader rules.
What a Medigap application actually asks
Outside a guaranteed issue window, insurers screen your health history, and they publish the criteria on the application itself.
Conditions insurers list as reasons to decline
KFF reviewed 15 Medigap applications from 12 insurers. Grounds for denial included Alzheimer’s disease, cancer, congestive heart failure, diabetes with complications, kidney failure and stroke.
Medications and functional status also count
The same review of real applications found screens for transplants, pacemakers, difficulty with daily activities, and medication thresholds such as insulin above 50 units.
The waiting period usually will not apply
Federal law permits a six-month wait for pre-existing conditions without six months of prior creditable coverage. Time in Medicare Advantage already counts, so direct switchers rarely wait.
💡 Expert Note: Standards differ by company and state, so one insurer’s decline is not every insurer’s.
Your state may give you rights federal law doesn’t
Four states — Connecticut, Massachusetts, Maine and New York — require insurers to offer Medigap continuously or annually to everyone 65 and older, KFF reports.
What those four states actually do
Connecticut and New York run continuous open enrollment. Massachusetts sets an annual window, though insurers there enroll year-round in practice. Maine guarantees one month yearly, Plan A only.
Birthday rules do not do what people think
Several states operate birthday rules. They let someone who already holds a Medigap policy move to a plan with equal or lesser benefits. They give a Medicare Advantage enrollee nothing.
How to check your own state
State law shifts every session. Minnesota added a one-time window for ages 65 to 70 in August 2026. Confirm current rules with your state insurance department.
Apply first, disenroll second
Apply for the Medigap policy before you disenroll, not after.
Why the order matters
Medicare lets you apply while still enrolled, provided you are leaving, with coverage starting once the old plan ends. A denial then costs nothing.
- Check whether a guaranteed issue right applies.
- Apply to insurers while still enrolled.
- Get written approval and an effective date.
- Disenroll so dates line up.
What Original Medicare leaves uncapped
Original Medicare sets no annual out-of-pocket limit. Every Medicare Advantage plan must have one.
⚠️ Costly Mistake: Disenroll first, get declined second, and you face a $283 Part B deductible, 20% coinsurance with no ceiling, and a $1,736 hospital deductible per benefit period — 2026 CMS figures, before the Part B premium.
Common questions about switching from Medicare Advantage to Medigap
1. Can I switch from Medicare Advantage to Medigap anytime?
No. You may leave during two annual windows, but Medigap acceptance follows separate rules entirely.
2. Does Medicare Advantage Open Enrollment give me Medigap rights?
No. That January-to-March window lets you leave your plan, but creates no guaranteed issue right.
3. What is the Medicare Advantage trial right?
Protects people who joined when first eligible and return to Original Medicare within 12 months. Ask SHIP.
4. How long do I have to apply for Medigap?
From 60 days before your Medicare Advantage coverage ends until 63 days after. Confirm dates with SHIP.
5. Can a Medigap insurer deny me for health reasons?
Yes, outside your Medigap Open Enrollment Period or a guaranteed issue window. Underwriting applies in most states.
6. Which conditions cause a Medigap denial?
Applications reviewed by KFF named cancer, heart failure, stroke, kidney failure and diabetes with complications. Criteria vary.
7. Will I face a pre-existing condition waiting period?
Rarely, switching directly, because months in Medicare Advantage count as creditable coverage. An agent can verify.
8. Which states allow Medigap without underwriting?
Connecticut, Massachusetts, Maine and New York guarantee access continuously or annually for people 65 and older.
9. Does a birthday rule let me buy Medigap?
No. Birthday rules let existing Medigap policyholders change plans. They create no right to buy Medigap.
10. Should I disenroll before applying for Medigap?
No. Apply while still enrolled, because Medicare permits it and a denial then costs nothing. Confirm dates.
11. What if I am denied after leaving Medicare Advantage?
You hold Original Medicare with no out-of-pocket cap unless another carrier accepts you. Ask SHIP about alternatives.
Your next step
Two steps, in this order. Answer Medicare’s own eligibility questions to see whether a guaranteed issue right applies. Then call your State Health Insurance Assistance Program before cancelling anything, because the counseling is free.
Leaving Medicare Advantage is reversible. Losing Medigap access often is not.
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