Many people assume Medigap works like Medicare Advantage, with a yearly window to change. It doesn't. This article covers how to spot guaranteed-issue rights, what underwriting looks at, which state deadlines apply (with Virginia and West Virginia as worked examples), and how to switch without leaving a gap in coverage.
Key Takeaways
- Medigap has no annual open enrollment like Medicare Advantage or Part D.
- Outside a protected situation, a carrier can review your health history.
- Some states add birthday or anniversary windows, each with its own limits.
- Don't cancel your current policy until the new one is approved and effective.
What Medigap Is and Why Someone Might Switch
Medigap is private insurance that helps pay Original Medicare cost-sharing: deductibles, copayments and coinsurance. You need both Part A and Part B to buy it. It cannot pay Medicare Advantage costs, and selling you one while you're in Advantage is illegal unless you're returning to Original Medicare.
Standardized plans are lettered A, B, C, D, F, G, K, L, M and N. Same-letter policies carry the same basic benefits (Massachusetts, Minnesota and Wisconsin standardize differently). Plans C and F are unavailable to people newly eligible for Medicare on or after January 1, 2020.
Common reasons to switch:
- Premium increases
- Paying for benefits you don't use
- Wanting different cost-sharing
- Poor service
- A move
- A different insurer
Insurers can charge substantially different premiums for identical lettered benefits, which is why switching appeals. But a cheaper quote isn't the whole picture. Weigh how the carrier prices its policies:
| Pricing method | Premium based on | Why it rises |
|---|---|---|
| Community-rated | Generally the same regardless of age | Inflation and other factors |
| Issue-age-rated | Age when you buy | Inflation and other factors |
| Attained-age-rated | Your current age | Aging plus inflation |
No method guarantees a fixed premium. Ask about the carrier's rate history and any discounts you may qualify for. CMS notes that some insurers discount for married people, women, non-smokers, annual or electronic payment, and multiple policies. Also weigh the risk of giving up a policy you may not get back.
When Can You Switch Medigap Plans Without Underwriting?
You can switch Medigap plans without medical underwriting during your one-time open enrollment period and when a guaranteed-issue right applies. Outside those windows, you can still apply, but federal law doesn't require the new insurer to accept you or offer the same terms.
Federal enrollment and guaranteed-issue opportunities
The one-time Medigap open enrollment period lasts six months. It starts the first month you're 65 or older and enrolled in Part B. During that window, insurers can't use medical underwriting to deny coverage or charge more based on your health. It doesn't repeat annually.
Guaranteed-issue rights are event-based. Common triggers:
- Your Medicare Advantage plan leaves Medicare or stops serving your area
- Your employer, retiree, union or COBRA coverage ends
- You move outside a Medicare SELECT or Advantage service area
- You joined Advantage when first eligible at 65 and return within a year
- You dropped Medigap to try Advantage for the first time and return within a year
- Your Medigap insurer goes bankrupt, or you lose coverage through no fault of your own
Windows generally open up to 60 days before coverage ends and close no more than 63 days after. For employer coverage, the clock runs from the latest of the coverage end date, the termination notice date, or a claim denial date. Which policies you're entitled to varies by event, and available plans differ across CMS guides and state rules.
Confirm your exact options with Medicare.gov or your state insurance department.
Timing outside protected periods
Applying anytime doesn't mean approval anytime. Underwriting can end in approval, a higher premium, restricted choices or denial, depending on the carrier and state.
The October 15 to December 7 election period governs Advantage and drug plan changes. It doesn't create Medigap guaranteed-issue rights. The same goes for the January 1 to March 31 Advantage Open Enrollment, which only lets existing Advantage enrollees switch Advantage plans or return to Original Medicare.
How Medigap Underwriting Affects a Plan Change
Medical underwriting is the carrier's review of your health history to decide whether to accept you, at what price, and whether a pre-existing condition wait applies. It only applies when you lack guaranteed-issue protection.
What carriers may evaluate
Applications vary by company. Highmark's June 2026 application is one example. It asks about:
- Tobacco use, height and weight
- Hospitalizations and surgeries
- Diagnoses and treatment, such as cancer, heart disease, stroke, kidney disease, neurological conditions or recent joint replacement
- Prescriptions
Those are one product's questions, not universal denial criteria. Outcomes can hinge on how a question is worded, when treatment happened, medication history, and whether a condition is ongoing or resolved.
Pre-existing conditions
A pre-existing condition doesn't block every switch. Under guaranteed issue, there's no health review and no exclusion. In an ordinary application, the carrier may review everything.
Review pending procedures, recent hospital or skilled-care stays, serious chronic conditions, and heavy prescription use before you apply. Only the carrier makes the final call.
Separately, a policy may impose a waiting period of up to six months for a condition diagnosed or treated in the prior six months. At least six months of creditable coverage eliminates it, and shorter coverage reduces it. Waiting-period relief isn't the same as an underwriting waiver.
Preparing for an application
Gather these before you apply:
- Your current policy and Medicare card
- Diagnoses and treatment dates
- A medication list and physician details
- Recent procedures
- Proof of lost coverage or another qualifying event
Answer every health question accurately and completely. Untruthful statements can lead to termination. Ask the carrier or a licensed agent how answers are verified. Don't apply just to "see if you'd get in" without understanding what happens if you do.
State-Specific Rules and Timing
Federal rules are only the floor. Some states add birthday, anniversary or year-round switching rights without underwriting. Always check the exact conditions, since most protect same-or-lower benefits, not upgrades.
Virginia and West Virginia
| Requirement | Virginia | West Virginia |
|---|---|---|
| Window | 60 days starting on your birthday, each year | First day of birthday month through 60 days after |
| Existing coverage | Qualifying Virginia Medigap policy | Held continuously 24 months; each replacement restarts that requirement |
| Benefits | Same benefits (G to G) | Same or lesser standardized benefits |
| Insurer | Any Virginia Medigap insurer | Current issuer or affiliate, with a limited exception |
| Health protection | No underwriting or waiting periods | No denial, underwriting or waiting period |
Virginia's rule took effect July 1, 2025, per the Virginia SCC guidance. West Virginia's rule, described in Bulletin 26-02, is not unrestricted annual switching.
Other states and special situations
Other states differ:
- Birthday windows (30–63 days): California, Oregon, Idaho, Illinois, Oklahoma, Nevada, Kentucky, Louisiana, Maryland, Utah, and Wyoming
- Broader continuous protections: Maine, New York, Massachusetts, Connecticut, and Washington
Check the NAIC state chart (May 2026) for current details, since rules change.
Also note:
- Federal law generally doesn't require Medigap sales to people under 65. Virginia requires at least one plan for qualifying disability and ESRD beneficiaries; West Virginia does not.
- If you move, you can usually keep your Medigap while in Original Medicare, but moving alone doesn't guarantee a new policy without health questions.
To confirm what applies to you, contact Medicare.gov, your state insurance department, your SHIP (West Virginia: 1-877-987-4463; Virginia: VICAP through local Area Agencies on Aging), or a licensed agent.
How to Switch Medigap Plans Safely: A Step-by-Step Process
- Define your reason. Compare your current premium, benefits, cost-sharing, service, and rate history against what you'll need later.
- Check for a protected opportunity first. Document your enrollment date, lost coverage, move, insurer action, or birthday window before answering any health questions.
- Compare replacements. Look at same-letter plans, carrier pricing method, discounts, payment terms, and whether the plan fits your priorities.
- Apply, then wait. Get written approval, policy documents, and a confirmed effective date. CMS rules include a 30-day free look; keep the old policy while you decide, and expect to pay both premiums during the overlap.
- Coordinate the cancellation. Ask the old insurer directly, keep confirmation records, and verify that claims and payments are handled correctly.
Replacement rules still apply during the switch. A seller generally can't issue a second policy if they know you already have Medigap, unless you state in writing that you intend to cancel the old one. In West Virginia, agent-sold replacements require a signed replacement notice.
Muneris Benefits' licensed agents in Virginia and West Virginia can help eligible clients compare Medicare supplement options, review application considerations, and understand the transition. They can't guarantee approval, and they don't serve every state.
If an application is declined
A denial doesn't cancel your current policy. Standardized policies bought after 1992 are guaranteed renewable regardless of health changes. Confirm your coverage is still active, review the denial reason, and ask whether another carrier or a state window applies. A later guaranteed-issue event may also open a door.
Medicare Advantage is a different model, not an automatic fallback. Compare:
- Provider access and network rules
- Cost-sharing and yearly out-of-pocket limits
- Prescription coverage (most Advantage plans include it; newly sold Medigap doesn't)
- Whether you could return to Medigap later, which isn't assured
Conclusion: Protect Your Coverage Before You Switch
The safest order is simple:
- Confirm eligibility
- Compare coverage and cost
- Apply
- Cancel only after approval and an effective date are confirmed in writing
Verify time-sensitive rules with Medicare.gov and your state insurance department. If a health condition, a move, employer coverage, or a Medicare Advantage change is involved, get individualized guidance before you act.
Frequently Asked Questions
Can you change from Medicare Advantage to a supplement?
Possibly, during certain enrollment or guaranteed-issue situations, such as a trial right. Outside those, expect medical underwriting. Verify your deadline and eligibility first.
Can you switch supplemental plans anytime?
You can apply anytime, but you're only entitled to acceptance without underwriting in protected situations. State rules and guaranteed-issue events can change the outcome.
What states allow switching Medigap plans without underwriting?
Several do, including Virginia and others with birthday or continuous rules. Details vary by timing, benefits, carrier and eligibility, so check your state insurance department rather than an old list.
Can you change Medicare supplement plans with pre-existing conditions?
With guaranteed issue, yes, without health questions. An ordinary application may be underwritten, which could mean a different price or denial.
Is a supplemental plan better than an advantage plan?
Neither wins universally. The better fit depends on your doctors, costs, travel, prescription needs, health and eligibility to enroll.
What is Medigap?
Medigap is private insurance that helps pay certain Original Medicare costs. It generally can't be used with a Medicare Advantage plan.
