Best Medigap Plans for 2026: Which Supplement Plan Fits You?

If you're on Original Medicare in 2026, you already know the coverage has real gaps. Part A comes with a $1,676 inpatient hospital deductible per benefit period — not per year, per benefit period — meaning a second hospitalization within the same year could trigger that deductible again. Part B covers 80% of outpatient costs after you meet its $257 annual deductible, leaving you responsible for the remaining 20% with no cap on what that 20% could total. A single cancer treatment, a cardiac procedure, or a prolonged hospital stay can expose you to tens of thousands of dollars in uncovered costs. Medicare Supplement insurance — commonly called Medigap — exists specifically to fill those gaps, and in 2026, there are ten standardized plan types to choose from. Understanding which one actually fits your health situation and budget is the most important insurance decision most Medicare beneficiaries will make.

Medigap plans are sold by private insurance companies but are federally standardized, meaning a Plan G from Aetna covers exactly the same benefits as a Plan G from Mutual of Omaha or Blue Cross Blue Shield. What differs between insurers is the premium you pay, the customer service quality, and the financial stability of the company. This standardization is enormously consumer-friendly — it means you can shop purely on price once you've identified the right plan letter for your needs. Plans are labeled A through N (with some letters retired over the years), and each letter represents a specific combination of benefits. The most popular plans in 2026 are Plan G, Plan N, and High-Deductible Plan G, and for good reason: they offer the best balance of coverage and cost for the majority of beneficiaries.

Plan G is the gold standard for new Medicare enrollees in 2026. It covers the Part A hospital deductible ($1,676 per benefit period), Part A coinsurance and hospital costs up to an additional 365 days after Medicare benefits are exhausted, Part B coinsurance or copayments (that 20% gap), Part B excess charges, skilled nursing facility coinsurance, hospice care coinsurance, and foreign travel emergency care up to plan limits. The only thing Plan G does not cover is the Part B annual deductible, which is $257 in 2026. Once you pay that $257 out of pocket at the start of the year, Plan G picks up essentially everything else Medicare approves. For a beneficiary with chronic conditions, multiple specialists, or any history of serious illness, Plan G's comprehensive coverage can provide genuine financial peace of mind. Average monthly premiums for Plan G in 2026 vary significantly by age, gender, tobacco use, and location — a 65-year-old non-smoking woman might pay $120–$160/month in many markets, while a 72-year-old man in a higher-cost state might pay $200–$250/month or more.

It's worth noting that Plan F — which was the most popular Medigap plan for decades because it also covered the Part B deductible — is no longer available to beneficiaries who became eligible for Medicare on or after January 1, 2020. If you turned 65 before 2020 and enrolled in Plan F, you can keep it. But for anyone who became Medicare-eligible in 2020 or later, Plan G is effectively the most comprehensive option available. This legislative change, part of the Medicare Access and CHIP Reauthorization Act, was designed to encourage beneficiaries to have some skin in the game on Part B costs. The practical impact is that Plan G has become the new benchmark for comprehensive Medigap coverage.

Plan N is the second most popular choice in 2026 and deserves serious consideration from healthier beneficiaries who want solid coverage without paying Plan G premiums. Plan N covers the same core benefits as Plan G — Part A deductible, Part B coinsurance, skilled nursing facility coinsurance, foreign travel emergency — with two key differences. First, Plan N does not cover Part B excess charges, which are the additional amounts (up to 15% above Medicare's approved rate) that doctors who don't accept Medicare assignment can charge. Second, Plan N requires cost-sharing at the point of care: up to $20 for office visits and up to $50 for emergency room visits that don't result in inpatient admission. In exchange for accepting these modest copays and the excess charge exposure, beneficiaries typically pay $30–$60 less per month than they would for Plan G. For a 65-year-old who sees her primary care doctor four times a year and rarely visits the ER, the math often favors Plan N — the annual copay exposure might total $80–$100, while the premium savings could be $400–$700 annually. The calculus shifts if you see multiple specialists regularly or live in an area with many non-participating Medicare providers.

High-Deductible Plan G, often abbreviated HD-G, is the most underappreciated option in the Medigap lineup and deserves more attention than it typically gets. In 2026, the High-Deductible Plan G deductible is $2,870 — meaning you pay all Medicare-approved costs out of pocket until you've spent $2,870 in a calendar year, after which the plan covers everything Plan G normally covers. The trade-off is dramatically lower premiums: many 65-year-olds can find HD-G plans for $30–$65/month, compared to $120–$160/month for standard Plan G. If you're relatively healthy and rarely exceed $2,870 in annual Medicare cost-sharing, you could save $1,000–$1,500 per year in premiums while still having a hard cap on your worst-case exposure. Think of it as catastrophic coverage with a meaningful deductible — similar in concept to a high-deductible health plan in the employer market. It's particularly well-suited for recently retired 65-year-olds in good health who want protection against a major health event without paying for comprehensive coverage they may not use.

According to CMS.gov data from the 2025 Medicare Supplement enrollment report, approximately 14.4 million Medicare beneficiaries were enrolled in a Medigap plan nationally, representing roughly 23% of all Medicare-eligible individuals. Plan G accounted for the largest share of new enrollments among standardized plans, overtaking Plan F as the most-selected option among recent enrollees. The same CMS data shows that Plan N enrollment has grown steadily as beneficiaries seek lower-premium alternatives to Plan G, while High-Deductible Plan G remains underutilized relative to its value proposition — suggesting many beneficiaries and even some insurance agents are not fully familiar with its structure.

Pricing for Medigap plans is determined by one of three rating methods, and understanding which method an insurer uses can have enormous long-term financial implications. Community-rated plans charge the same premium to all enrollees regardless of age — a 65-year-old and a 78-year-old pay the same amount, though premiums may still increase over time due to inflation and claims experience. Issue-age-rated plans set your premium based on your age when you first enroll and don't increase it as you get older (though they can still rise with inflation). Attained-age-rated plans start lower but increase as you age, often becoming the most expensive option by your mid-70s. Most plans sold in the United States use attained-age rating, which means the low premium that attracted you at 65 may look very different at 75. When comparing plans, always ask the insurer which rating method they use and request a projection of premiums at ages 70, 75, and 80.

Enrollment timing is critical with Medigap. Your best opportunity to enroll without medical underwriting is during your six-month Medigap Open Enrollment Period, which begins the month you turn 65 and are enrolled in Medicare Part B. During this window, insurers cannot deny you coverage or charge you higher premiums based on pre-existing conditions. Outside this window, most states allow insurers to use medical underwriting — meaning they can reject your application or charge more if you have health conditions like diabetes, heart disease, COPD, or a history of cancer. If you miss your open enrollment window and later try to switch from a Medicare Advantage plan back to Original Medicare plus a Medigap plan, you may find it difficult or expensive to get coverage depending on your health status and your state's rules.

Several states have enacted additional consumer protections worth knowing. Thirteen states — California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, and Oregon — have a birthday rule that gives Medigap enrollees a 30-day window around their birthday each year to switch to a plan with equal or lesser benefits without medical underwriting. New York and Connecticut go further, requiring guaranteed issue for Medigap plans year-round regardless of health status, which makes those states particularly favorable for beneficiaries with significant health histories. Massachusetts, Minnesota, and Wisconsin have their own standardized Medigap systems that differ from the federal lettered-plan structure, so beneficiaries in those states should review their state-specific options carefully.

When shopping for a Medigap plan, start with Medicare.gov's Medigap policy search tool, which allows you to compare plans and insurers available in your ZIP code. Look beyond the premium to the insurer's financial strength rating (A.M. Best ratings of A or higher are preferable), their history of premium increases in your state, and whether they offer household discounts — many insurers offer 5–12% discounts when two people in the same household both enroll. You can also contact your State Health Insurance Assistance Program (SHIP) for free, unbiased counseling. SHIP counselors are trained volunteers who can walk you through plan comparisons without any sales pressure or commission incentive. To find your local SHIP office, visit shiphelp.org or call 1-800-MEDICARE.

One final consideration: Medigap plans do not include prescription drug coverage. If you enroll in a Medigap plan, you will need to separately enroll in a Medicare Part D prescription drug plan to cover your medications. Part D plans are sold by private insurers, vary significantly in formulary coverage and cost-sharing, and change annually. The Annual Enrollment Period (October 15 – December 7) is when you can switch Part D plans for the following year. Failing to enroll in Part D when you first become eligible can result in a permanent late enrollment penalty — 1% of the national base beneficiary premium for every month you went without creditable drug coverage — so don't delay this decision when you first sign up for Medicare.