How to Switch Medicare Supplement (Medigap) Plans — 2026

Unlike Medicare Advantage plans — which can be switched annually during open enrollment — Medicare Supplement (Medigap) plans don't have an annual open enrollment. Once your initial enrollment window closes, switching to a different Medigap plan usually requires passing medical underwriting in most states. But there are important exceptions to know.

When You Can Switch Without Underwriting

1. Your Medigap Open Enrollment Period (Best Window)

The most important guaranteed-issue window is your 6-month Medigap Open Enrollment Period: the 6 months starting when you are both age 65 (or older) and enrolled in Medicare Part B. During this window, every insurer must accept you for any Medigap plan they sell — regardless of your health history. No medical questions, no surcharges, no denials.

If you haven't used this window yet, it is your most valuable tool. Make your initial Medigap selection carefully — you may not have another guaranteed-issue chance.

2. State Birthday Rules

Three states have Birthday Rules that give policyholders a guaranteed-issue window each year:

Several other states have Anniversary Rules with similar protections: Idaho, Illinois, Louisiana, Missouri, Nevada, Oklahoma, and Wisconsin. Check with your state insurance department for exact rules, as these laws can change.

3. Year-Round Guaranteed Issue States

New York and New Jersey require insurers to offer Medigap coverage year-round without medical underwriting, regardless of health status. In these states, you can switch plans at any time. Connecticut also has community-rating requirements with enhanced consumer protections.

4. Federal Trial Rights

Federal law provides guaranteed-issue rights in specific circumstances:

• Trial right: If you enrolled in Medicare Advantage for the first time and want to switch back to Original Medicare + Medigap within 12 months, you have a guaranteed-issue right. You can enroll in any Medigap plan without underwriting. This is a one-time right.
• Plan discontinuation: If your Medigap plan is discontinued or leaves your area, you have guaranteed-issue rights to certain comparable plans.
• Company insolvency: If your Medigap insurer becomes insolvent, federal guaranteed-issue rights protect you.

Switching Plans With Underwriting (Most States)

Outside the situations above, switching Medigap plans in most states requires passing medical underwriting. The insurer will ask about your health history and can:

• Decline to cover you
• Charge a higher premium (in states that allow surcharges)
• Add a waiting period for pre-existing conditions (limited by federal and state law)

What Insurers Look For

Common conditions that frequently lead to denial or increased premiums during underwriting include:

• Cancer (active or recent history)
• Chronic kidney disease or dialysis
• Congestive heart failure or recent heart surgery
• Chronic obstructive pulmonary disease (COPD) requiring ongoing oxygen
• Stroke or TIA (transient ischemic attack)
• Insulin-dependent diabetes with complications
• Alzheimer's disease or dementia

Having one of these conditions doesn't automatically mean you'll be denied — it depends on the severity, how recently it occurred, and which insurer you apply to. Some insurers have more lenient underwriting standards than others. An independent broker can help identify which companies are more likely to approve your application for your specific health profile.

Step-by-Step: How to Switch Medigap Plans

1. Determine if you have guaranteed-issue rights. Check whether you're in a Birthday Rule state, a year-round guaranteed-issue state, or within a trial-rights window. If you have guaranteed-issue rights, proceed without hesitation.
2. Get quotes from multiple insurers for the same plan letter. Because Medigap benefits are standardized, premium is the only meaningful variable between insurers. Use Medicare.gov or a licensed broker.
3. Research the insurer's rate increase history. A lower starting premium is worth less if the insurer raises rates aggressively. Ask for data on annual rate increases for the past 3–5 years in your state.
4. Apply for the new plan. Do this before canceling your old plan. In most cases, don't cancel your existing coverage until you receive written confirmation of approval for your new plan.
5. Align coverage dates. Make sure your new plan starts the day after your old plan ends — no gaps. Coordinate the timing carefully to avoid any period without Medigap coverage.
6. Cancel your old plan after written confirmation of the new plan's start date. Keep documentation.

Is It Worth Switching to Save on Premiums?

If you're in good health and have guaranteed-issue rights (Birthday Rule state, NY/NJ, or within your trial-rights period), it's often worth comparing quotes annually. Premiums for the same plan letter can vary $30–$80/month between insurers in the same state — a difference of $360–$960 per year for identical coverage.

If you do not have guaranteed-issue rights and need to pass underwriting, weigh the risk carefully. If your health has declined since your initial enrollment, you may not be able to switch — and if you apply and are denied, it could affect future applications.