Medicare Supplement Plans by State: What Can I Buy?

Are Medicare Supplement plan benefits the same in every state?

Medicare Supplement plan benefits are the same for the same letter in most states, regardless of the insurer, but three states use different standardization systems. Medicare.gov explains that most states offer ten plan types, labeled A–D, F, G, and K–N. Not every plan is sold everywhere, and insurers do not necessarily sell every plan available in a state.

Massachusetts, Minnesota, and Wisconsin standardize Medigap policies differently from the common lettered-plan approach. That matters when comparing a policy in one of these states with a plan description written for most of the country: the plan names and benefit structures may not map one-to-one. Start with the state-specific options rather than assuming a Plan G or Plan N comparison works identically everywhere.

For shoppers in other states, standardized benefits make price comparisons more useful. If you compare the same letter from several companies, the basic coverage is generally alike, so the meaningful differences are premium, pricing method, discounts, and any restrictions associated with the policy. Medicare.gov’s Medigap basics explains the standardization framework; use it to identify what is comparable before reviewing quotes.

Why does the same Medigap plan cost more in one state than another?

The same Medigap plan can cost more in one state than another because insurers set premiums by plan, company, and location, and the rating method changes how costs may evolve over time. Medicare.gov says premiums for the same lettered plan can differ substantially between companies, even when their basic benefits match.

Three rating methods are used. With community rating, pricing is not based on age; with issue-age rating, the premium is based on the age when the policy is bought; and with attained-age rating, the premium can rise as the policyholder gets older. These methods make a current quote only part of the comparison: two policies with similar starting prices may behave differently as time passes.

The Centers for Medicare & Medicaid Services’ guide, Choosing a Medigap Policy, advises asking the insurer which method it uses and, for attained-age policies, how often age-related increases occur. Premiums typically increase each year, and other factors can include discounts, medical underwriting when there is no protected enrollment right, Medicare SELECT network restrictions, and high-deductible options. For example, the CMS guide lists a $2,950 deductible for high-deductible Plans F or G in 2026; verify the applicable plan and year when comparing costs.

Put the quote into context before choosing: compare the premium today, how it is rated, and features that could affect access or out-of-pocket spending. Do not treat the lowest initial premium as the full cost comparison. Medicare.gov’s Medigap costs page describes the cost factors to ask each insurer about.

How can I find which Medicare Supplement plans and insurers are available in my state?

Find local Medigap options by checking the state insurance department’s company list, then request official quotes from multiple insurers for the same plan letter. Medicare.gov cautions that not all plans are offered in every state and not all insurers sell every plan available there, so a national plan overview is not a substitute for a local availability check.

Use this practical comparison checklist:

1. Identify your state’s standardization system. Confirm whether your state follows the common lettered-plan format or uses a different system, as Massachusetts, Minnesota, and Wisconsin do.
2. Check local availability. Contact your State Insurance Department for a list of companies selling Medigap policies in your state. Medicare.gov’s guide to buying a Medigap policy also recommends contacting your local State Health Insurance Assistance Program (SHIP) for free, impartial help.
3. Compare like with like. Get official quotes from several companies for the same plan letter. Ask about the rating method, discounts, expected age-related increases where relevant, and whether the policy has a Medicare SELECT network or high-deductible design.
4. Check switching rights before cancelling or replacing coverage. Federal law generally does not guarantee a right to switch outside the six-month federal open enrollment period or a qualifying guaranteed-issue situation. State law may add protections, so ask the insurance department about your circumstances before you apply.
5. Keep notices and application records. If you are relying on a guaranteed-issue right, Medicare advises keeping notices that show existing coverage is ending and related records. Some guaranteed-issue applications have a specified filing period, so confirm the deadline for your situation.

The federal Medigap Open Enrollment Period lasts six months, starting with the first month a person is both 65 or older and enrolled in Medicare Part B. During that period, insurers cannot deny coverage because of pre-existing health problems. Since federal rules do not provide a universal switching right afterward, checking state protections before making a change is a necessary part of the quote process, not an optional final detail.

If you move but remain in Original Medicare, you generally can keep your existing Medigap policy. A move does not automatically mean you must replace it; changing policies may lead to medical questions or a higher premium unless a protected right applies. Confirm how the current policy works at your new address and check the state department’s guidance before deciding.