Medicare Supplement, or Medigap, policies have a well-known catch: once you are past your one-time federal enrollment window, an insurer can normally deny you coverage or charge more based on your health. Two states pushed back on that rule this year, in different ways. New Mexico and West Virginia both now give existing Medigap holders a yearly opportunity to switch plans without medical underwriting, and the details of who qualifies and how far the protection reaches are not the same in either state.
New Mexico’s Birthday-Month Window, Starting January 1, 2027
New Mexico Governor Michelle Lujan Grisham signed Senate Bill 21 into law on March 6, 2026. The law creates an annual open-enrollment period tied to a policyholder’s birthday: it begins on the first day of the beneficiary’s birthday month and runs 60 days, during which anyone 65 or older already enrolled in a Medigap plan can switch to a plan of equal or lesser value without being denied coverage or charged a higher rate because of their health history.
That timeline and estimate come from the state’s own Aging and Long-Term Services Department: the protection takes effect January 1, 2027, and the department estimates it will reach more than 70,000 New Mexicans currently enrolled in Medigap.
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West Virginia’s Narrower Rule, Already Live Since June 11
West Virginia’s version, House Bill 4869, moved faster and came with more strings attached. Per the state Insurance Commissioner’s own bulletin summarizing the 2026 legislative session, the guaranteed-issue right took effect June 11, 2026, and is available only to someone whose existing Medigap policy has been continuously in force for at least 24 months. Once eligible, an enrollee gets a guaranteed-issue right once per calendar year, during a window that opens on the first day of their birthday month and closes 60 days later — the same general shape as New Mexico’s window, but gated behind a two-year coverage requirement New Mexico’s law does not impose.
What “Guaranteed Issue” Actually Blocks Insurers From Doing
In both states, the core protection is the same three things an insurer is barred from doing during the window: denying the application, applying medical underwriting, or imposing a pre-existing-condition waiting period. That matters because outside a guaranteed-issue window, a Medigap applicant can typically be asked detailed health questions, and an insurer in most states can turn the application down or charge more for conditions like diabetes, a recent cancer diagnosis, or heart disease. A once-a-year window that suspends underwriting gives policyholders in both states a real opportunity to leave an insurer whose premiums have climbed, or whose service they no longer want, without medical risk pricing standing in the way.
West Virginia’s enrolled bill text spells out the once-per-calendar-year limit precisely: after using the guaranteed-issue right to replace a policy, the 24-month continuous-coverage clock resets, so the new policy itself has to be held for another 24 months before it can be used to trigger a second guaranteed-issue switch. That prevents the window from becoming an annual shopping event for the same policyholder and keeps it closer to a periodic reset than an always-open door.
The Fine Print West Virginia Adds That New Mexico Doesn’t
West Virginia’s law narrows where that new policy can come from. The replacement Medigap policy generally has to be issued by the same insurer that wrote the enrollee’s existing policy, or by an affiliated insurer, and it can only match the same or a lesser level of standardized benefits — an enrollee cannot use the window to upgrade to richer coverage. There is a carve-out: if neither the current insurer nor an affiliate has accepted new Medigap applications for that benefit level in the past 12 months, the enrollee can then buy from any insurer authorized to sell Medigap in the state. West Virginia’s bill also separately guarantees issue rights for anyone 65 or older who loses Medicaid eligibility, letting them buy any Medigap policy actively sold to new enrollees at that time. New Mexico’s statute, by contrast, does not restrict the switch to the enrollee’s current insurer or an affiliate — the equal-or-lesser-value condition is the main limit described in the state’s own summary.
What This Means for Everyone Else
Guaranteed-issue birthday rules are not new nationally — several states already run some version of one — but they remain the exception rather than the rule, and coverage varies enough state to state that a Medigap holder cannot assume a right that exists in a neighboring state applies at home. New Mexico and West Virginia residents now have a real reason to mark their birthday month on the calendar and shop rates during that window; everyone else still needs to check their own state insurance department before assuming a similar right exists, since the federal Medigap framework leaves this particular protection almost entirely up to the states to add on their own.
West Virginia’s law also does something New Mexico’s does not: it separately guarantees Medigap access for anyone 65 or older who loses Medicaid eligibility, regardless of where they are in their birthday-month cycle. That group can buy any Medigap policy actively sold to new customers at the time they apply, from any authorized insurer in the state — a distinct protection aimed at a different trigger than the annual switching window, and one worth knowing about separately if a change in Medicaid status is what prompts the search for Medigap coverage in the first place.
For residents of either state, the practical step is the same regardless of which law applies: confirm the exact birthday-month window with the state insurance department or, in New Mexico’s case, the Aging and Long-Term Services Department, rather than relying on an insurance agent’s summary. Both states’ rules hinge on exact dates — the first day of a birthday month, 60 days after — and missing the window by even a few days forfeits the guaranteed-issue right until the following year.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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