When a Medicare Advantage plan terminates its contract or stops serving a member’s area, federal rules can open a guaranteed-issue window to buy a Medigap policy without a health screening. That protection matters because Medigap insurers are otherwise free to reject applicants or charge them more based on medical history outside of narrow enrollment periods. The right is real and valuable, but it is also narrower than the phrase suggests: it covers specific standardized plans, runs on a strict clock, and generally requires returning to Original Medicare.
How losing a Medicare Advantage plan opens a Medigap door
A guaranteed-issue right means a Medigap insurer must sell a person a policy, cannot use medical underwriting to deny coverage, and cannot charge more because of a pre-existing condition. Outside these protected situations, Medigap sales in most states run on the insurer’s terms, and an applicant with a serious diagnosis can be turned down or quoted a far higher premium.
Medicare’s guidance on guaranteed-issue rights lists an involuntary loss of Medicare Advantage coverage among the events that trigger the protection, including a plan leaving the person’s service area or ending its Medicare contract. In those cases the member did not choose to give up coverage, and the rules give a limited path back into a Medigap policy on protected terms.
The trigger is the involuntary nature of the loss. A member who simply dislikes a plan and drops it voluntarily generally does not get the same guaranteed-issue treatment. The protection is built for people forced out by the plan’s own exit, not for routine plan shopping.
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Which policies the guaranteed right actually covers
The right is not an open pass to buy whatever Medigap policy a person wants. In the common plan-leaves-the-area situation, federal rules limit the guaranteed choice to specified standardized plans sold in the person’s state, historically Plans A, B, C, D, F, G, K, or L. Medicare’s Choosing a Medigap Policy guide spells out which lettered plans a guaranteed-issue right reaches, and it is a defined list rather than the full menu.
Two of those plans carry an extra catch. Plans C and F, which cover the Part B deductible, are closed to people who became eligible for Medicare on or after January 1, 2020. A newly eligible beneficiary using a guaranteed-issue right can choose only from the plans still open to them, which in practice usually means Plan G, Plan D, or one of the high-deductible or cost-sharing options.
The guaranteed right also generally assumes the person is enrolling in Original Medicare. A Medigap policy only works alongside Original Medicare, not alongside a Medicare Advantage plan, so exercising the right means leaving the Advantage system rather than pairing Medigap with a replacement Advantage plan. That structural rule, not the marketing language around it, defines what a dropped member can actually buy.
The 63-day clock and how the right is triggered
Timing is the part most easily missed. The guaranteed-issue right tied to a lost Medicare Advantage plan generally lasts 63 days, measured from when the coverage ends or when the member receives notice of the loss, whichever protection applies. Once that window closes, the applicant is usually back to ordinary underwriting, where health can determine both approval and price.
A person can often start the Medigap application before the old coverage actually ends, so the new policy is in place when Original Medicare begins. Acting early avoids a gap in supplemental coverage and prevents a scramble in the final days of the window. The Medicare program advises keeping the notice from the departing plan, because that paperwork documents the qualifying event a Medigap insurer will ask to see.
The value of avoiding underwriting is easiest to see in dollars. A beneficiary in good health can often buy Medigap outside a protected window and pass a health review, but someone with diabetes, heart disease, or a cancer history may be quoted a far higher premium or turned down outright in a state without year-round protections. For that person, a guaranteed-issue window created by a plan’s exit can be the only realistic chance to secure Medigap coverage at a standard rate, which is why the 63-day deadline carries genuine financial weight rather than serving as a technicality.
The protection interacts with the annual enrollment calendar. A plan exit effective January 1 typically surfaces during the fall, when members are already weighing coverage for the coming year, so the guaranteed-issue right and the open enrollment period can overlap. A member can use the enrollment window to move to Original Medicare and the 63-day right to secure a Medigap policy on protected terms.
The bottom line for a dropped member is that the door is open but framed. Losing a Medicare Advantage plan does create a rare chance to buy Medigap without a health screening, yet the choice is limited to specified plans, conditioned on enrolling in Original Medicare, and bounded by a 63-day clock. Understanding those limits before the window opens is what turns the right into usable coverage rather than a missed opportunity.
This article was produced with AI assistance and reviewed by The Money Overview editorial team.
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