A retiree who joins a Medicare Advantage plan the moment they first become eligible for Medicare is often warned to choose carefully, since switching plans later can mean medical underwriting. Federal rules soften that warning for the first year: anyone who enrolls in Medicare Advantage when newly eligible, or who drops an existing Medigap policy to try Medicare Advantage for the first time, gets a 12-month trial period. If they decide within that window that Original Medicare suits them better, they have a guaranteed right to buy a Medigap policy without a single health question standing in the way.
The Two Paths Into the Trial Right
The protection covers two distinct situations, and Medicare treats them slightly differently. In the first, a person enrolls in Medicare Advantage the moment they become eligible for Medicare, at 65 or otherwise, rather than starting on Original Medicare; if they change their mind within 12 months, they can return to Original Medicare and buy any Medigap policy sold by any insurer in their state, according to Medicare Rights Center’s guidance on Medigap purchasing rights.
In the second situation, someone who already had a Medigap policy drops it to try Medicare Advantage for the first time, regardless of how many years they had already been on Medicare. That person’s trial right works differently: rather than guaranteeing access to any Medigap plan on the market, it guarantees the right to buy back the exact same policy from the exact same insurer, provided that insurer still sells it; if not, the person can buy a different standardized plan sold in their state.
Both versions of the trial right apply only once, tied to a person’s first experience with Medicare Advantage. A retiree who has already used the protection and later drops a second Medicare Advantage plan does not get another automatic guaranteed-issue window under this rule, which is part of why counselors urge anyone weighing Medicare Advantage for the first time to treat the coming year as a genuine test rather than a routine formality.
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What Guaranteed Issue Actually Guarantees
Outside of a protected window like this one, an insurer selling Medigap can ask health questions, decline an application outright, or impose a waiting period before covering a pre-existing condition. A guaranteed issue right removes all three obstacles at once: the insurer must sell the policy, must sell it at the best available rate regardless of health history, and cannot exclude coverage for a condition the applicant already has.
That protection matters most for someone who developed a health condition after leaving Medigap for Medicare Advantage, since it is precisely the population medical underwriting is designed to screen out or charge more. A retiree who tried Medicare Advantage while healthy and later found the network or coverage didn’t fit their needs does not have to disclose a diagnosis picked up along the way in order to get back into Medigap at a standard rate.
Outside a guaranteed issue window, a retiree with even a well-managed chronic condition can face a flat denial from every Medigap insurer in their state, not merely a higher premium, which is why the distinction between “the best available rate” and “coverage at any rate” matters so much to someone counting on Medigap to fill gaps that Medicare Advantage’s out-of-pocket structure doesn’t. The trial right’s guarantee applies regardless of which of the up to ten standardized Medigap plans a retiree wants, so long as the insurer offers it in their state.
The Application Window That Can’t Be Missed
The trial right is not open-ended. A person must apply for the new Medigap policy no more than 60 days before their Medicare Advantage coverage ends, or no more than 63 days after it ends, according to guidance on the federal trial right that cites Medicare.gov directly. Applying before the Medicare Advantage plan actually ends generally produces a cleaner transition, since the new Medigap policy can take effect immediately rather than leaving a gap in supplemental coverage.
The right only protects a move back to Original Medicare; it does not extend to someone who wants to leave one Medicare Advantage plan for a different Medicare Advantage plan, which instead falls under the annual enrollment periods that apply to everyone. Retirees are advised to keep copies of enrollment letters, disenrollment notices, and any correspondence from their Medicare Advantage plan, since a Medigap insurer may ask for that paperwork as proof of eligibility before honoring the guaranteed issue right.
Once the 12-month window closes without action, the guaranteed protection disappears, and getting into Medigap after that point generally means going through the same medical underwriting as anyone applying outside a protected period. For a retiree who is on the fence about whether Medicare Advantage or Original Medicare with a Medigap policy fits their situation, the trial year functions as a one-time, no-penalty test drive that does not exist for people switching later in retirement.
This article was drafted with AI assistance and edited for accuracy.
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