Best Medicare Supplement Plan 2026: Why the Letter Matters More Than the Brand

This article is for general educational purposes only and is not insurance, medical, or financial advice. We are not affiliated with the U.S. government or Medicare. For official information, visit Medicare.gov or call 1-800-MEDICARE. See our Medical & Financial Disclaimer for details.

Medicare Supplement insurance, or Medigap, is the one corner of Medicare where the product is fixed by law and only the seller changes. The federal government writes the benefits; the insurance company writes the price. Medicare’s own guide states it plainly: “Price is the only difference between policies with the same letter” sold by different companies.

That one sentence should change how you shop. A Plan G bought from a household-name insurer pays exactly what a Plan G from a small regional carrier pays, in the same situations, for the same bills. So the real decision is not which brand to trust. It is which letter fits how you use healthcare, and then who will sell you that letter for the least money over the years you will hold it.

Why This Article Doesn’t Rank Companies

Plenty of pages will hand you a top-five list of Medigap carriers for 2026. We don’t, and the reason is worth understanding before you read anyone else’s.

Medigap premiums are filed with each state’s insurance department, not set nationally. The same company can be the cheapest Plan G in one state and among the most expensive in the state next door, and within a single state its quote changes with your age, your sex, your ZIP code and whether you use tobacco. A national average, or a national ranking built from one, cannot tell you what you will be charged. Worse, a ranking implies the coverage differs between the names on it, and it does not.

What we can do is explain exactly what varies, so that when you compare real quotes you know what you are looking at. Medicare’s official Medigap policy search lists the policies sold in your ZIP code, and your State Health Insurance Assistance Program will walk you through them for free.

Which Letter Fits You

For anyone newly eligible for Medicare, the practical choice comes down to two letters, plus a cheaper variant of one of them.

Plan G is the most complete policy a new enrollee can buy. It covers Part A coinsurance and hospital costs, Part B coinsurance, the first three pints of blood, hospice coinsurance, skilled nursing facility coinsurance, Part B excess charges, and 80% of emergency care abroad. The one thing it leaves you is the annual Part B deductible, $283 in 2026. After that deductible is met, a Plan G holder’s Medicare-covered costs are essentially zero.

Plan N covers the same ground with two gaps. It pays 100% of the Part B coinsurance, but you pay a copayment of up to $20 for some office visits and up to $50 for an emergency room visit that does not end in admission. It also does not cover Part B excess charges, which are what a doctor who has not accepted Medicare’s approved amount may bill you on top of it. In most states very few doctors do this, which is why many people take the lower Plan N premium and accept the risk.

Plans C and F are the ones people’s older relatives talk about, and they are closed to you unless you were already eligible for Medicare before 2020. Policies sold to people new to Medicare on or after January 1, 2020 are not allowed to cover the Part B deductible, and since covering it was what made C and F distinctive, both were withdrawn for new enrollees. If you were eligible before that date you may still be able to buy one.

No letter covers prescription drugs. This is the gap people are most likely to miss, because Medigap is otherwise so complete. A Medigap policy fills in what Original Medicare’s Part A and Part B leave you and stops there; policies sold since 2006 contain no drug coverage of any kind. Going the Medigap route therefore means buying a standalone Part D plan as well, and taking it when you are first eligible rather than when you first need it, because the late enrollment penalty lasts for as long as you hold the coverage.

What you pay	Plan G	Plan N	High-deductible G
Part B deductible	$283	$283	Counts toward the $2,950
Part B coinsurance	Nothing	Up to $20 per office visit	Nothing after the deductible
Emergency room, not admitted	Nothing	Up to $50	Nothing after the deductible
Part B excess charges	Covered	Not covered	Covered after the deductible
Annual policy deductible	None	None	$2,950 in 2026

The High-Deductible Version Most People Never Hear About

High-deductible Plan G is the same policy as ordinary Plan G, with one condition attached: the insurer pays nothing until you have personally paid a set amount of Medicare-covered costs in the year. CMS sets that amount annually, and for 2026 it is $2,950, effective January 1.

In exchange the monthly premium is a fraction of standard Plan G. The trade is straightforward: you are buying protection against a catastrophic year rather than smoothing out an ordinary one. It suits someone with savings who rarely sees a doctor, and suits badly anyone who would struggle to find $2,950 in January. Because the deductible resets each calendar year, two bad years in a row cost you twice.

What Genuinely Differs Between Companies

If the benefits are identical, four things are left, and only one of them appears on a quote.

The pricing method is the one that costs people the most and is asked about the least. Medicare’s guide describes three. A community-rated policy charges broadly the same premium to everyone regardless of age. An issue-age-rated policy sets your premium from your age on the day you buy, and it does not rise because you got older. An attained-age-rated policy is priced on your current age, so it climbs as you do. Attained-age policies are usually the cheapest at 65 and the most expensive at 80, which is precisely when people can least afford to switch. Ask which method applies before you compare two quotes, because otherwise you are not comparing the same thing.

Rate-increase history is the second. Every insurer raises Medigap rates over time; how steeply they have done it in your state over the past several years is a matter of public filing with the state insurance department, and it predicts your future cost better than this year’s opening price.

Financial strength and service matter less than people assume, because the benefits are guaranteed by the policy form rather than by the insurer’s goodwill, but they still decide how painless a claim is and how stable your carrier will be in fifteen years.

Who is even licensed where you live is the fourth, and it quietly eliminates most national rankings. Blue Cross Blue Shield, for instance, is not one company but a group of independent, locally operated businesses, so its Medigap pricing and availability change at the state line.

One recent example shows why the name on the envelope is the weakest thing to choose on. On March 19, 2025, Health Care Service Corporation completed its purchase of Cigna’s Medicare Advantage, Medicare Supplement, Part D and CareAllies businesses; those policies now trade under the HealthSpring name. Nobody’s coverage changed, because it legally could not. Only the letterhead did.

The Six Months That Decide What You’ll Pay

Medigap has one window in which your health is nobody’s business. The Medigap Open Enrollment Period is the six-month period that starts the first day of the month you are 65 or older and enrolled in Part B. Inside it, an insurer must sell you any policy it offers, at the same price it would charge a healthy applicant.

Outside it, Medicare is blunt about where you stand: there is no federal guarantee that any company will sell you a policy at all, and if one does, it may cost more because of your health. This is the single most expensive thing to get wrong in Medigap, and it is a timing mistake rather than a product one.

A handful of states go further than the federal floor, and the rules have been moving. Delaware’s birthday rule took effect on January 1, 2026, letting residents switch to an equal or lesser policy in the window running from 30 days before their birthday to 30 days after, without underwriting. Nevada’s runs from the first day of the birthday month for 60 days. Indiana took a different route: Senate Enrolled Act 215 gave people under 65 who qualify for Medicare through disability a guaranteed-issue right from January 1, 2025, closing a gap that leaves under-65 beneficiaries without Medigap access in much of the country. We cover what happens outside these windows in our guide to Medigap with pre-existing conditions.

How to Actually Shop It

1. Pick the letter first, on how you use healthcare rather than on price. Our Plan G versus Plan N comparison works through that decision.
2. Get quotes for that one letter from several insurers licensed in your state. The spread between companies for the same letter is routinely wider than the spread between letters.
3. For each quote, ask which pricing method it uses and what the company’s rate increases have been in your state. A cheap attained-age policy and a slightly more expensive issue-age one are not the same purchase.
4. Buy inside your six-month window if you possibly can, and if you have already missed it, check your state’s rules before you assume you are stuck.

Frequently Asked Questions

Is Plan G really identical no matter who sells it? Yes. Medigap benefits are standardized in federal law, and Medicare’s own guide says all plans with the same letter offer the same basic benefits regardless of the company or the state. Price, pricing method and service are what differ.

Which company has the lowest Medigap premiums? There is no national answer, because rates are filed state by state and vary by age, sex, ZIP code and tobacco use. The only reliable method is to get current quotes for your own letter in your own ZIP code.

Why can’t I buy Plan F? Because policies sold to people new to Medicare on or after January 1, 2020, cannot cover the Part B deductible. If you first became eligible for Medicare before that date, you may still be able to buy Plan F or Plan C.

Can I switch Medigap companies later? You can apply at any time, but outside your open enrollment window there is no federal guarantee of acceptance, and most states allow medical underwriting. Some states, including Delaware and Nevada, provide an annual window around your birthday instead.

Do I compare Medigap against Medicare Advantage separately? Yes, they are two different paths and you cannot hold both. Our Medicare Advantage versus Medicare Supplement guide covers that decision, which is the harder of the two to reverse.

Bottom Line

There is no best Medicare Supplement company in the way there is a best car or a best phone, because every company is selling the identical product. For most people newly eligible, Plan G is the most complete option available and Plan N is the cheaper version of the same idea with two small copayments and one real exposure. The high-deductible version of Plan G exists for people who would rather insure the catastrophe than the year.

Once you have the letter, the money is made or lost on two things nobody advertises: whether you bought inside your six-month window, and which pricing method your policy uses. Get those right and the brand on the card barely matters.

Sources

• Choosing a Medigap Policy: A Guide to Health Insurance for People with Medicare — Medicare.gov. Source for benefits being standardized by letter, price being the only difference between identical letters, the withdrawal of Plans C and F for people new to Medicare on or after January 1, 2020, the Plan N copayments, the three pricing methods, and the fact that Medigap policies sold since 2006 do not include prescription drug coverage.
• Compare Medigap plan benefits — Medicare.gov. Source for what each letter covers, including Part B excess charges and foreign travel emergency care.
• Calendar Year 2026 Deductible for High-Deductible Medigap Plans F, G and J — Centers for Medicare & Medicaid Services. Source for the $2,950 deductible effective January 1, 2026.
• 2026 Medicare Parts A & B Premiums and Deductibles — Centers for Medicare & Medicaid Services. Source for the $283 annual Part B deductible.
• When can I buy Medigap? — Medicare.gov. Source for the six-month Medigap Open Enrollment Period and for what protections exist outside it.
• HCSC Completes the Acquisition of The Cigna Group’s Medicare and CareAllies Businesses — Health Care Service Corporation. Source for the March 19, 2025 closing date and the businesses transferred.
• Delaware’s Medicare birthday rule and new enrollment protections now in effect — State of Delaware. Source for the Delaware birthday rule and its window.
• Assembly Bill 250 guidance — Nevada Division of Insurance. Source for the Nevada birthday window.
• Senate Enrolled Act 215 — Indiana State Health Insurance Assistance Program. Source for the guaranteed-issue right for under-65 beneficiaries from January 1, 2025.

All figures on this page were checked against the sources above on September 20, 2026. Premiums are not quoted because Medigap rates are filed state by state and vary by age, sex, ZIP code and tobacco use; no national average would apply to your own quote.

Disclaimer: Figures in this article reflect 2026 rules published by the Centers for Medicare & Medicaid Services (CMS) and Medicare.gov and are subject to change. State rules vary and individual circumstances differ. Always confirm current details directly with Medicare.gov, 1-800-MEDICARE, your state insurance department, or a licensed agent before making a decision.