Most people who want to buy a Medigap policy after their first year on Medicare have to answer health questions, and an insurer can turn them down or charge more for a history of diabetes, heart disease, or cancer. There’s one major exception: someone whose Medicare Advantage plan is cancelled out from under them gets a federally protected window to buy a Medigap policy with no medical underwriting at all. The window is real, but it’s narrow — roughly 63 days — and it closes on a clock that starts the moment the old coverage actually ends, not whenever the paperwork gets around to it.
What actually triggers the guaranteed-issue right
The protection applies specifically when a Medicare Advantage plan is discontinued, when it stops serving the area where the member lives, or when it undergoes a network change significant enough that Medicare has approved it as a qualifying event. In each of those situations, the member didn’t choose to leave — the plan effectively left them — and federal rules treat that involuntary loss differently from someone simply deciding they want different coverage. Outside of a triggering event like this, or the one-time Medigap Open Enrollment Period tied to first signing up for Part B, an insurer can legally ask about health history and price a policy — or refuse to sell one — accordingly.
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The window’s actual start and close dates
The guaranteed-issue application period isn’t a flat 63 days from the notice letter — it opens up to 60 days before the old Medicare Advantage coverage is scheduled to end and closes 63 days after it actually ends, giving an applicant a combined stretch to submit paperwork on either side of the transition. That means someone can start shopping for a Medigap policy as soon as they know the end date, without waiting for coverage to actually lapse first. What the window does not forgive is a late application: miss the 63-day mark after coverage ends, and the protection disappears, leaving standard medical underwriting as the only path back to Medigap in most states.
Which Medigap plans are actually guaranteed
Guaranteed issue doesn’t mean every Medigap letter plan is available without underwriting — it means insurers selling certain standardized plans in the state have to accept the applicant at the best rate they offer, with no waiting period for a pre-existing condition. Medigap plans are standardized by letter, and the benefits attached to each letter are identical no matter which company sells it — price is the only thing that differs between insurers offering the same plan. For anyone who became eligible for Medicare on or after January 1, 2020, Plans C and F are permanently off the table regardless of guaranteed-issue status, which leaves Plan G, including the high-deductible version, as the strongest coverage tier that federal guaranteed-issue rules still reach for that group.
State rules can open the door wider than federal law
Federal guaranteed issue is a floor, not a ceiling, and Medicare’s own guidance says as much: on its tool for checking Medigap switch-and-drop rights, Medicare directs anyone whose situation doesn’t clearly qualify to contact their State Insurance Department, because some states extend guaranteed-issue-style protections further than the federal minimum. A handful of states, including California and Oregon, run an annual “birthday rule” that lets any Medigap policyholder switch to a different insurer’s plan with equal or lesser benefits without answering health questions, independent of whether a Medicare Advantage plan was ever involved. California’s version opens a 60-day window starting on the first day of the policyholder’s birth month; Oregon’s runs 30 days before the birthday through 30 days after. Both differ from the Medicare Advantage guaranteed-issue trigger in an important way: they recur every year on a fixed date, rather than being tied to a one-time involuntary loss of coverage, but they only allow a lateral or downgrade move, not a switch to a richer plan.
Medicare’s own switch-and-drop guidance also flags a second guaranteed-issue scenario worth knowing: someone enrolled in a Medicare SELECT policy who wants to switch to a standard Medigap plan, or return to a Medigap policy they dropped when they joined Medicare SELECT, has to apply either up to 60 days before their Medicare SELECT coverage ends or within 63 days after it ends — the same structural window as the Medicare Advantage trigger, just anchored to a different type of plan.
Why this differs from ordinary Medigap shopping
Most Medigap shopping happens under far less favorable terms. The one truly open window everyone gets is the six-month period that starts the month a person turns 65 and enrolls in Part B — inside that stretch, any Medigap policy sold in the state is available regardless of health history. After that window closes, insurers in most states are allowed to underwrite, and a guaranteed-issue right is one of a short list of exceptions that reopens the door. That’s what makes the loss of a Medicare Advantage plan meaningfully different from, say, simply deciding a plan’s premium got too expensive: the involuntary nature of the exit is what unlocks the no-questions-asked purchase.
What to do inside the window
The practical task is comparison shopping under a deadline. Because every insurer selling the same lettered plan has to offer identical benefits, the only variable worth comparing is price, and Medicare’s own plan-comparison tool lays out what each letter actually covers before a single call gets made. Keeping the Medicare Advantage non-renewal or discontinuation notice on hand matters just as much as the shopping itself — that letter is typically what an applicant has to show an insurer as proof the guaranteed-issue right applies, and without it, a company has no obligation to waive its normal underwriting questions.
This article was researched and drafted with the assistance of AI and reviewed by The Financial Wire editorial team.
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David M. Keller is a finance writer based in Columbus, Ohio, covering personal finance and consumer-focused economic topics. He earned his degree in journalism from Ohio University and began his career reporting on local business and economic trends for a regional media outlet. Since then, he has contributed to a variety of online publications, focusing on clear, practical coverage of topics such as cost of living, debt, and everyday financial decision-making.
