If you've spent any time researching Medicare supplement insurance, you've probably noticed that Plan G keeps coming up as the gold standard for new enrollees. That reputation is largely earned. Since Plan C and Plan F were closed to people who became eligible for Medicare on or after January 1, 2020, Plan G has stepped into the role of most comprehensive Medigap policy available. But comprehensive coverage and smart coverage aren't always the same thing. Before you commit to a Plan G premium that could run $1,500 to $3,600 a year or more, it's worth understanding exactly what you're buying, what you're not, and whether the math works in your favor.
Original Medicare — Parts A and B — covers a lot, but it leaves meaningful gaps that can add up fast if you're hospitalized or need frequent specialist care. Part A, which covers hospital stays, comes with a deductible of $1,676 per benefit period in 2026. That's not an annual deductible — it resets every time you start a new benefit period, which means a serious illness with multiple hospitalizations could trigger it more than once in a single year. Part B, which covers outpatient services and doctor visits, requires you to pay 20% of all approved costs after your annual deductible, with no cap on out-of-pocket spending. A single cancer treatment course or a series of cardiac procedures could leave you with tens of thousands of dollars in coinsurance bills. Plan G is designed to close almost all of those gaps.
Here's what Plan G actually covers in 2026: the Part A hospital deductible ($1,676), Part A coinsurance and hospital costs for up to 365 days after Medicare benefits are exhausted, Part B coinsurance or copayments (that 20% you'd otherwise owe), the first three pints of blood, Part A hospice care coinsurance or copayments, skilled nursing facility coinsurance, and foreign travel emergency care up to plan limits (typically 80% after a $250 deductible, up to a $50,000 lifetime maximum). The one gap Plan G does not fill is the Part B deductible, which is $257 in 2026. You pay that once per year out of pocket, and then Plan G takes over. That's the only meaningful difference between Plan G and the now-closed Plan F, which covered the Part B deductible as well.
For most people, that $257 annual Part B deductible is a manageable expense — and it's the reason Plan G premiums are typically $20 to $40 per month lower than Plan F premiums for those who can still access Plan F (generally people who became Medicare-eligible before 2020). If you're eligible for both, the math almost always favors Plan G. Pay $30 less per month in premiums, and you're saving $360 a year — well above the $257 deductible you're absorbing. The only scenario where Plan F might pencil out is if you're in a state where the premium gap between the two plans is unusually narrow.
Premium pricing for Plan G is where things get complicated, and where many beneficiaries make expensive mistakes. Unlike Medicare Advantage plans, which are priced uniformly within a service area, Medigap premiums vary significantly from one insurance company to the next — even for identical coverage. That's because all Plan G policies must cover the same standardized benefits (set by federal law), but insurers are free to charge whatever the market will bear. In practice, this means two 65-year-old women in the same zip code could be quoted $130/month from one insurer and $220/month from another for the exact same Plan G coverage. Over five years, that difference is $5,400.
Insurers use three different methods to set premiums, and understanding them matters for long-term cost planning. Community-rated plans charge everyone the same premium regardless of age — your rate goes up only due to inflation and general cost trends, not because you're getting older. Issue-age-rated plans set your premium based on your age when you first enroll, and it stays relatively stable over time. Attained-age-rated plans start lower but increase as you age, which can make them look attractive at 65 but expensive by 75 or 80. Many beneficiaries are drawn to the lower initial premiums of attained-age plans without fully appreciating how steeply those premiums can climb. If you're comparing quotes, always ask which rating method each insurer uses.
The best time to enroll in Plan G — or any Medigap policy — is during your 6-month Medigap Open Enrollment Period, which begins the month you turn 65 and are enrolled in Medicare Part B. During this window, federal law gives you guaranteed issue rights: insurers cannot deny your application, charge you more, or impose waiting periods based on your health history or pre-existing conditions. Once that window closes, you're generally subject to medical underwriting in most states, which means an insurer can reject you or charge significantly higher premiums if you have conditions like diabetes, heart disease, COPD, or a history of cancer. Missing this window is one of the most costly mistakes Medicare beneficiaries make.
There are some important state-level protections worth knowing about. Thirteen states have what's called a birthday rule, which gives you a 30-day window each year around your 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 are currently in a Plan G with a high premium, you may be able to shop for a lower-cost Plan G from a different insurer each year without health questions. New York and Connecticut take it further, requiring guaranteed issue rights year-round for Medigap policies. If you're in one of these states, you have more flexibility than most — but you should still compare premiums carefully, because the birthday rule only protects your right to switch, not your right to a lower price.
High-deductible Plan G is a variation worth considering if you're relatively healthy and want to keep monthly premiums low while still having a safety net for catastrophic costs. In 2026, the high-deductible version requires you to pay the first $2,870 in Medicare-covered costs before the plan kicks in (this deductible adjusts annually with inflation). In exchange, monthly premiums can be as low as $30 to $60 in many states — a fraction of standard Plan G costs. The trade-off is that you're taking on more financial risk in any given year. For someone who rarely uses medical care, the premium savings over several years can more than offset the higher deductible. For someone with ongoing health needs, the standard Plan G typically provides better value.
One area where Plan G falls short — and where many beneficiaries are surprised — is prescription drug coverage. Plan G, like all Medigap policies, does not include Part D drug coverage. You'll need to enroll in a standalone Part D prescription drug plan separately, either during your Initial Enrollment Period or during the Annual Enrollment Period (October 15 through December 7 each year). Failing to enroll in Part D when first 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. That penalty is added to your Part D premium for as long as you have Medicare, so it's not something to ignore.
Plan G also does not cover dental, vision, or hearing care — services that Original Medicare largely excludes. If you need coverage for routine dental cleanings, eyeglasses, or hearing aids, you'll need to purchase separate standalone policies or look at Medicare Advantage plans that bundle these benefits. This is a genuine trade-off: Medicare Advantage plans often include dental and vision, but they typically use provider networks and require prior authorizations that Medigap plans do not. With Plan G, you can see any doctor or specialist in the country who accepts Medicare — no referrals, no network restrictions. For people who travel frequently, see multiple specialists, or simply value that freedom, the lack of network restrictions is a significant advantage.
When comparing Plan G to Plan N — the other popular Medigap option — the key differences are cost-sharing and premium. Plan N typically costs $30 to $60 less per month than Plan G, but it requires copayments of up to $20 for office visits and up to $50 for emergency room visits that don't result in inpatient admission. Plan N also exposes you to Part B excess charges — the additional amount (up to 15% above Medicare's approved rate) that doctors who don't accept Medicare assignment can charge. If you live in a state where excess charges are common, or if you see specialists who don't accept assignment, Plan G's full coverage of those charges may be worth the higher premium. If you're in good health, rarely visit the ER, and primarily see doctors who accept Medicare assignment, Plan N's lower premium might make more sense.
To find the best Plan G premium in your area, use the Medicare Plan Finder tool at Medicare.gov or contact your State Health Insurance Assistance Program (SHIP) — a free, unbiased counseling service available in every state. SHIP counselors can walk you through plan comparisons, explain your guaranteed issue rights, and help you avoid the sales pressure that sometimes comes with insurance agents who earn commissions. You can find your local SHIP contact through Medicare.gov or by calling 1-800-MEDICARE. The bottom line on Plan G is this: it offers genuine, predictable financial protection against Medicare's most significant cost gaps, and for many beneficiaries — especially those with chronic conditions or high healthcare utilization — the premium is money well spent. But it's not a one-size-fits-all answer, and the insurer you choose matters as much as the plan itself.