Medicare Supplement Insurance (Medigap) in 2026: The Complete Guide Before You Turn 65
Nobody warned me about the Part B deductible.
That's what a retired school principal from Ohio told me when she called to dispute a medical bill she hadn't expected. She had Medicare. She had done what she thought was the right paperwork. And then she got a bill for services she assumed were fully covered — because nobody had explained to her that Original Medicare was never designed to carry all the weight.
If you're approaching 65, or helping a parent navigate this, or realizing mid-retirement that your coverage has gaps you didn't know about, this article is written for you.
Medicare Supplement Insurance — officially called Medigap — is one of the most searched and most misunderstood products in American healthcare. Understanding it before you need it, rather than after a hospital stay surprises you, can save thousands of dollars and a great deal of stress.
What Original Medicare Actually Doesn't Cover
Let's start with the problem Medigap solves, because most people who are surprised by their Medicare costs are surprised for the same reason: they assumed the program covered more than it does.
Original Medicare has two main parts. Part A covers inpatient hospital care, skilled nursing facility stays, hospice, and some home health services. Part B covers outpatient services — doctor visits, preventive care, lab tests, and durable medical equipment.
Here's what most people don't realize until it's too late:
The Part A deductible in 2026 is $1,736 per benefit period — not per year. If you're hospitalized twice in the same year and they're considered separate benefit periods, you could owe that deductible twice. The Part B deductible is $283 annually. The standard Part B premium jumped to $202.90 per month in 2026, up $17.90 from 2025.
More critically: Original Medicare has no annual out-of-pocket maximum. None. If you have a catastrophic illness, a serious accident, or a condition requiring extended care, the bills can theoretically grow without limit. For most private insurance, the out-of-pocket cap is a fundamental protection. Medicare's absence of one is a detail that matters enormously.
Medigap exists specifically to fill these holes. In exchange for a monthly premium paid to a private insurance company, Medigap picks up costs that Medicare leaves behind — deductibles, coinsurance, copayments, and in some plans, care you receive abroad.
The Standardization Nobody Explains Well
Here's the thing that confuses people most about Medigap: all the plans are federally standardized.
That means a Plan G from Mutual of Omaha covers exactly the same benefits as a Plan G from AARP/UnitedHealthcare, which covers exactly the same benefits as a Plan G from Blue Cross Blue Shield. The letter determines the coverage. The company determines the price.
This is actually great news for consumers once you understand it, because it simplifies comparison shopping dramatically. You're not trying to decode fine print differences between policies — you're comparing prices for identical products.
There are ten standardized Medigap plans, labeled A through N (with some letters retired or restricted). But the market has effectively consolidated around three dominant options. Plan G accounts for about 39% of all Medigap enrollees. Plan F holds 36%, though it's no longer available to new enrollees who became eligible for Medicare after January 1, 2020. Plan N captures roughly 10%. Together these three account for about 85% of the market.
For anyone turning 65 today, the practical choice is between Plan G and Plan N.
Plan G vs. Plan N: Where the Real Decision Lives
Plan G is the most comprehensive Medigap option available to new enrollees in 2026. After you satisfy the annual Part B deductible — $283 — Plan G covers 100% of remaining Medicare-approved costs. No copayments for office visits. No coinsurance. No surprises. Whatever Medicare approves, Plan G pays its share completely.
The average monthly premium for Plan G is around $180 in 2026, though this varies significantly by age, location, and the insurance company you choose. A 65-year-old in a lower-cost state might find Plan G for $120 a month from a competitive carrier. Someone in New York or Florida might pay considerably more.
Plan G is the right choice if you use healthcare frequently, have a chronic condition, travel extensively within the U.S. or abroad, or simply want absolute predictability in your healthcare budget. The person who wants to go to any doctor who accepts Medicare, anywhere in the country, without thinking twice about cost — that person wants Plan G.
Plan N covers essentially the same core benefits as Plan G with one meaningful difference: you'll pay copayments of up to $20 for some office visits and up to $50 for emergency room visits that don't result in inpatient admission. Plan N also does not cover Part B excess charges — amounts that doctors who don't accept Medicare assignment can legally charge above the Medicare-approved rate (up to 15% more).
The trade-off is a meaningfully lower premium. Plan N typically runs $30 to $60 less per month than Plan G from the same carrier, which adds up to $360 to $720 annually.
Plan N makes sense if you're generally healthy and see the doctor infrequently, you live in a state where excess charges are banned (Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island, and Vermont all prohibit them), and you're comfortable with predictable but modest cost-sharing when you do seek care.
The math often favors Plan N for healthy individuals who visit the doctor a handful of times per year. But the math shifts toward Plan G for anyone with ongoing health needs — and healthcare needs tend to increase with age in ways that are difficult to predict at 65.
The Enrollment Window Most People Miss
This is the detail that causes the most financial pain, and it's not highlighted nearly enough.
When you turn 65 and enroll in Medicare Part B, a six-month Open Enrollment Period begins. During this window, insurance companies cannot deny you a Medigap policy based on your health, cannot charge you more due to pre-existing conditions, and cannot impose waiting periods. You can enroll in any plan offered in your state at standard rates. This is called guaranteed-issue.
After that window closes, those protections largely disappear. In most states, insurance companies can require medical underwriting — meaning they can review your health history and either charge you significantly higher premiums or deny coverage entirely. Conditions like diabetes, heart disease, previous cancer diagnoses, or sleep apnea can all be used against you.
The practical consequence is stark: someone who misses their Open Enrollment window and develops a health condition may find they cannot get comprehensive Medigap coverage at any reasonable price. The time to buy is when you first become eligible, not later.
There are exceptions. Certain life events create what's called "guaranteed issue rights" — situations where you can enroll without underwriting even outside open enrollment. These include losing employer coverage, moving out of a Medicare Advantage plan's service area, or having your current plan discontinued. As of 2026, 21 states now offer some form of annual guaranteed-issue switching window, typically tied to your birthday month.
If you're over 65 and currently enrolled in Medicare Advantage, you still have options — but they're more limited and require careful navigation.
How Much Does Medigap Actually Cost?
Premiums vary more than most people expect, for reasons that aren't always obvious.
The average Plan G premium nationwide is about $180 per month for a 65-year-old woman who doesn't smoke and qualifies for preferred pricing. But "average" here covers a lot of ground. Rates can run from under $100 in some states to over $300 in others for essentially the same product.
Three pricing structures exist in the market:
Community-rated plans charge everyone the same premium regardless of age. A 65-year-old and a 78-year-old pay the same monthly amount. These plans often start higher but grow more slowly — and in the long run they frequently cost less than the alternatives for people who stay enrolled for many years.
Issue-age-rated plans set your premium based on your age when you first enroll. They don't increase based on aging alone (though they can still rise with inflation). Lock in at 65 and your rate doesn't jump when you hit 70. These can be excellent value if you enroll early.
Attained-age-rated plans — the most common type — set premiums that increase as you age. They often look cheapest when you're 65. By 75 or 80 they may be considerably more expensive. Over the full arc of coverage, attained-age plans frequently cost the most.
Most people focus on the first-year premium and don't ask about historical rate increases — which is a mistake. A company that raises premiums 10% to 12% per year is a meaningfully different financial proposition than one averaging 3% to 5% increases, even if they start at the same price.
The Insurance Companies Worth Knowing About
Because the plans are standardized, choosing a company comes down to three things: price, rate increase history, and financial stability.
AARP/UnitedHealthcare is the largest Medigap insurer in the country by enrollment. Nationwide availability, strong digital tools, and the brand recognition that comes with the AARP partnership make it a default consideration for many enrollees. Note that AARP membership (roughly $12 to $16 per year) is required. Their A.M. Best rating was recently adjusted from A+ to A, though the outlook remains stable.
Mutual of Omaha consistently earns high marks for pricing competitiveness, rate stability, and customer service. With one of the largest Medigap risk pools in the country, they tend to manage rate increases more predictably than smaller carriers — an advantage that compounds significantly over a decade of enrollment.
State Farm was highlighted by NerdWallet as a top 2026 pick based on premiums, rate increase history, and complaint rates. Their Medigap availability varies by state, so check your specific location.
Cigna (now operating as HealthSpring in some markets) and Humana also round out the top tier, with competitive pricing in many regions and solid financial strength ratings.
The right company for you depends on your state and ZIP code more than most national rankings suggest. Premiums for identical Plan G coverage can vary by 40% or more between carriers in the same market. Getting quotes from at least three companies before enrolling is not optional — it's the difference between paying $140 a month and $210 a month for the same benefits.
Medigap vs. Medicare Advantage: The Trade-off Nobody Simplifies Well
Every person approaching 65 faces a fundamental fork in the road: Medigap or Medicare Advantage.
Medicare Advantage (Part C) is an alternative to Original Medicare sold by private insurers. These plans often have lower or even $0 monthly premiums. Many include extras like dental, vision, and hearing coverage that Medigap doesn't touch. They sound very attractive on paper.
The trade-off is network restrictions and cost-sharing unpredictability. Medicare Advantage plans typically require you to use in-network providers, get referrals to see specialists, and can involve copayments and coinsurance that accumulate in ways that are hard to predict when you're healthy. In a serious illness year, your out-of-pocket costs under Medicare Advantage can be substantial — up to the plan's annual out-of-pocket maximum, which is often $4,000 to $7,000 or more.
Medigap costs more monthly but makes your healthcare costs far more predictable. You can see any doctor in the country who accepts Medicare — no network, no referrals. For people with serious health conditions, chronic diseases, or who travel frequently and can't depend on a local provider network, Medigap typically wins the financial comparison over time.
The decision isn't one-size-fits-all. Someone who's 65, healthy, doesn't travel much, and has modest healthcare usage might do well with Medicare Advantage for several years. Someone with diabetes, heart disease, or a cancer history — or who simply wants to never think about provider networks again — is usually better served by Medigap.
Critically: switching from Medicare Advantage back to Medigap later in life can be difficult or expensive due to underwriting requirements in most states. If you start with Medicare Advantage and want to switch to Medigap at 72 after a diagnosis, you may face significant obstacles. This asymmetry is one reason many advisors suggest defaulting to Medigap at initial enrollment if you can afford the premium.
What Medigap Doesn't Cover
Worth being clear on what you're not getting, even with the most comprehensive plan.
Medigap does not cover prescription drugs — you need a separate Medicare Part D plan for that. It does not cover routine dental, vision, or hearing care. It does not cover long-term care or custodial care. It covers one person only — your spouse needs their own separate policy.
These gaps aren't hidden, but they catch people off guard. A Medigap enrollee who skips Part D and then needs expensive medications has solved one problem while leaving another open. Dental and vision costs in retirement are real and meaningful. Knowing what Medigap solves — and what it doesn't — helps you build a complete coverage picture.
The One-Page Decision Framework
If you're turning 65 in the next twelve months, here's what to prioritize:
Enroll in Medicare Part B on time — your six-month Medigap open enrollment window starts from that date, and missing it has consequences you can't easily undo.
Compare Plan G and Plan N quotes from at least three carriers in your state. Pay attention to the pricing structure (community-rated vs. attained-age-rated) and ask about historical rate increase percentages.
Get a separate Part D quote for prescription drug coverage at the same time, and check whether any dental or vision add-on through other channels makes sense for your situation.
If you're currently on Medicare Advantage and considering a switch to Medigap, check your state's rules on guaranteed issue windows — 21 states now offer some form of annual switching protection, and the landscape has expanded in recent years.
The people who get this decision right are the ones who treat it like any other significant financial purchase: comparison shop, understand the trade-offs, and don't let the complexity of the system push them toward the path of least resistance. The stakes — thousands of dollars per year, potentially for decades — justify the time it takes to get it right.
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