Best Medigap Plans for 2026: What Medicare Beneficiaries Need to Know

Medicare Supplement insurance — commonly called Medigap — exists to fill the gaps that Original Medicare leaves behind. And those gaps are real. Medicare Part A carries a hospital deductible of $1,676 per benefit period in 2026, and Part B covers only 80% of most outpatient services after you meet the annual deductible of $257. For someone managing a chronic condition or facing a major surgery, those gaps can translate into thousands of dollars in out-of-pocket costs. Medigap plans are sold by private insurance companies but are standardized by the federal government, meaning a Plan G from one insurer covers exactly the same benefits as a Plan G from another — only the premium differs.

In 2026, the most popular Medigap plans among new enrollees are Plan G, Plan N, and Plan K. Plan G has become the gold standard for comprehensive coverage since Plan F was phased out for new Medicare enrollees in 2020. Plan G covers the Part A deductible, Part B coinsurance, skilled nursing facility coinsurance, foreign travel emergency care (up to plan limits), and the Part B excess charges that some doctors bill above Medicare's approved amount. The only thing Plan G does not cover is the Part B deductible, which at $257 in 2026 is a relatively minor exposure. Monthly premiums for Plan G vary widely by age, location, and insurer — expect to pay anywhere from $90 to $200 or more per month depending on where you live and how insurers price their policies.

Plan N is worth serious consideration for beneficiaries who are generally healthy and want to reduce their monthly premium. Plan N covers the same core benefits as Plan G with two important differences: it does not cover Part B excess charges, and it requires cost-sharing in the form of copays — up to $20 for physician office visits and up to $50 for emergency room visits that don't result in an inpatient admission. In many parts of the country, Plan N premiums run $30 to $60 per month less than Plan G. If you see your primary care doctor a handful of times per year and rarely visit specialists who bill excess charges, Plan N can deliver meaningful savings. However, if you live in a state where doctors frequently bill above Medicare rates — or if you see multiple specialists regularly — Plan G's broader protection may be worth the higher premium.

Plan K and Plan L are cost-sharing plans that cover a percentage of your Medicare expenses rather than paying them in full. Plan K covers 50% of most cost-sharing and has an out-of-pocket maximum of $7,220 in 2026, while Plan L covers 75% and caps your exposure at $3,610. These plans carry the lowest premiums of any Medigap option, sometimes under $60 per month, but they leave you exposed to significant costs if you have a serious illness or hospitalization. They tend to make the most financial sense for beneficiaries who have substantial savings to self-insure against that exposure and are primarily looking to protect against catastrophic costs rather than routine cost-sharing.

One of the most consequential decisions you'll make isn't which plan to choose — it's when you enroll. Federal law guarantees you the right to buy any Medigap plan sold in your state without medical underwriting during your 6-month Medigap Open Enrollment Period. This window opens automatically on the first day of the month you are both 65 or older and enrolled in Medicare Part B. During this period, insurers cannot deny you coverage, charge you more because of a pre-existing condition, or make you wait for coverage to begin. Once this window closes, most states allow insurers to use medical underwriting, which means someone with diabetes, heart disease, or a history of cancer may be charged significantly higher premiums — or denied coverage entirely. This is not a window to miss.

If you're past your initial enrollment window, there are still limited opportunities to switch or enroll in Medigap with guaranteed issue rights. Qualifying life events — such as losing employer-sponsored coverage, moving out of a Medicare Advantage plan's service area, or your current plan leaving Medicare — can trigger a Special Enrollment Period that restores your guaranteed issue rights for a limited time, typically 63 days. Additionally, thirteen states have enacted the birthday rule, which gives beneficiaries a 30-day window each year around their birthday to switch to a Medigap plan with equal or lesser benefits without medical underwriting. Those states are California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, and Oregon. If you live in one of these states and feel locked into a plan that no longer fits your needs or budget, your birthday may be your best opportunity to make a change.

Premium pricing is one area where beneficiaries frequently make expensive long-term mistakes. Medigap insurers use one of three pricing methods: community-rated (everyone pays the same regardless of age), issue-age-rated (your premium is based on your age when you first enroll and increases only with inflation), and attained-age-rated (your premium increases as you get older). Attained-age-rated plans often have the lowest initial premiums, which makes them attractive at first glance — but they can become significantly more expensive by the time you're in your 70s and 80s, precisely when your income may be fixed and your healthcare needs are greatest. When comparing plans, always ask the insurer which pricing method they use and request a projection of premiums over 10 to 15 years, not just the current rate.

Another factor that varies by insurer — even for identical plan letters — is rate stability history. Some insurers have raised premiums aggressively year over year, while others have maintained more modest increases. Your state's Department of Insurance maintains records of rate increase filings, and reviewing an insurer's history of increases before you commit can save you from an unpleasant surprise down the road. The Medicare Plan Finder tool at Medicare.gov allows you to compare Medigap plans available in your ZIP code, and the State Health Insurance Assistance Program (SHIP) in your state offers free, unbiased counseling to help you evaluate your options — call 1-800-MEDICARE to be connected to your local SHIP counselor.

Finally, it's worth understanding what Medigap does not cover, because these exclusions surprise many beneficiaries. No Medigap plan covers prescription drugs — you'll need a separate Part D plan for that. Medigap also does not cover dental, vision, or hearing care, long-term custodial care, or private-duty nursing. If you're comparing Medigap to Medicare Advantage, keep in mind that many Advantage plans bundle dental, vision, and drug coverage into a single plan, often with a $0 premium — but they also come with provider networks, prior authorization requirements, and variable out-of-pocket costs that can be difficult to predict. Medigap paired with Original Medicare gives you access to any doctor or hospital in the country that accepts Medicare, with no referrals and no network restrictions. For beneficiaries who travel frequently, have complex medical needs, or simply want the peace of mind of knowing their costs are capped, that freedom has real value that doesn't show up in a premium comparison.