Medigap Plan N has quietly become one of the most popular Medicare Supplement options on the market, and it's easy to see why when you look at the premium difference. In 2025, a 65-year-old woman in a mid-sized city might pay $110–$140 per month for Plan N, compared to $160–$200 per month for Plan G — the most comprehensive Medigap option available to new Medicare enrollees. That gap of $50 to $70 per month adds up to $600 to $840 per year in savings. But Plan N achieves those lower premiums by shifting some costs back to you in specific situations, and understanding exactly when those costs apply is the difference between a smart financial decision and an expensive surprise.
Let's start with what Plan N actually covers, because it's substantial. Like Plan G, Plan N covers the Medicare Part A hospital deductible (which is $1,676 in 2025), Part A coinsurance and hospital costs up to an additional 365 days after Medicare benefits are exhausted, Part B coinsurance or copayment (with exceptions noted below), the first three pints of blood, Part A hospice care coinsurance, skilled nursing facility care coinsurance, and foreign travel emergency care up to plan limits. That's a strong foundation of coverage that protects you from the most catastrophic hospital bills Medicare alone would leave you holding.
Here's where Plan N diverges from Plan G in ways that matter day-to-day. With Plan N, you can be charged a copay of up to $20 each time you visit a doctor's office — whether that's your primary care physician or a specialist. If you go to an emergency room and are not admitted to the hospital as an inpatient, you can be charged up to a $50 copay. These copays apply after you've met the Medicare Part B deductible, which is $257 in 2025. For someone who sees their doctor four times a year, that's potentially $80 in copays annually — a fraction of the premium savings. But for someone managing multiple chronic conditions who sees several specialists monthly, those $20 copays can accumulate quickly and erode the premium advantage.
The more significant — and often overlooked — gap in Plan N is its lack of coverage for Medicare Part B excess charges. Here's what that means in plain terms: Medicare sets an approved payment amount for every medical service. Doctors who accept Medicare assignment agree to accept that amount as payment in full. But doctors who do not accept assignment — called non-participating providers — can legally charge up to 15% more than Medicare's approved amount. That extra 15% is called an excess charge, and Plan N does not cover it. Plan G does. If you have a $2,000 procedure with a non-participating doctor, you could owe up to $300 in excess charges that Plan N won't touch. Before choosing Plan N, it's worth calling your current doctors and any specialists you see regularly to confirm they accept Medicare assignment. You can also verify this at Medicare.gov's Care Compare tool, which lists provider participation status.
Excess charges are relatively rare in most parts of the country — only about 5% of Medicare-participating physicians nationwide bill them — but they're more common in certain states and specialties. States like New York, Connecticut, Massachusetts, Minnesota, Ohio, Pennsylvania, Rhode Island, and Vermont have actually banned excess charges entirely through state law, which means if you live in one of those states, the Plan N versus Plan G decision becomes much simpler: you can choose Plan N without worrying about excess charge exposure at all. If you live elsewhere, the risk is real but manageable if you stick to assignment-accepting providers.
Premium stability over time is another factor worth weighing carefully. Medigap insurers use different rating methods that affect how your premium grows as you age. Community-rated plans charge everyone the same premium regardless of age. Issue-age-rated plans set your premium based on your age when you first enroll and increase only with inflation. Attained-age-rated plans — the most common type — start lower but increase as you get older, sometimes significantly. Plan N's lower starting premium can look very attractive at 65, but if your insurer uses attained-age rating, that premium could climb substantially by the time you're 75 or 80. When comparing Plan N quotes, always ask the insurer which rating method they use and request a projection of what your premium might look like in 10 years. This single question can completely change the math on which plan is the better long-term value.
Enrollment timing matters enormously with any Medigap plan. Your best window is the six-month Medigap Open Enrollment Period that begins the month you turn 65 and are enrolled in Medicare Part B. During this window, insurers cannot deny you coverage or charge you more based on pre-existing health conditions — this is your guaranteed issue right. Once that window closes, insurers in most states can use medical underwriting, meaning they can reject your application or charge higher premiums if you have conditions like diabetes, heart disease, or a history of cancer. If you're already past 65 and enrolled in Medicare Advantage, you may be able to switch to a Medigap plan during the Medicare Advantage Open Enrollment Period (January 1 through March 31) or if you qualify for a Special Enrollment Period, but underwriting may apply depending on your state.
A handful of states offer additional protections worth knowing. In California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, and Oregon, a birthday rule 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. If you're in one of these states and currently on Plan G but want to move to Plan N to lower your premiums, your birthday window may be the right time to make that switch — without risking rejection based on your health history.
Who is Plan N actually right for? The honest answer is that it works best for people who are in reasonably good health, have confirmed that their regular doctors accept Medicare assignment, and are comfortable paying small predictable copays rather than a higher fixed monthly premium. If you rarely see doctors beyond an annual wellness visit and occasional sick visit, the math almost always favors Plan N. If you're managing multiple chronic conditions, see several specialists regularly, or live in a state where excess charges are common and your specialists don't accept assignment, Plan G's higher premium may actually cost you less in total annual out-of-pocket spending. Running the numbers with your actual visit history — not a hypothetical — is the most reliable way to make this decision.
One practical step: get quotes for both Plan N and Plan G from at least three to five insurers in your area. Because Medigap benefits are standardized by federal law, a Plan N from one insurer covers exactly the same services as a Plan N from any other insurer — the only differences are premium, price stability over time, and the insurer's financial strength and customer service reputation. Your State Health Insurance Assistance Program (SHIP) offers free, unbiased counseling to help you compare options. You can find your local SHIP counselor at shiphelp.org, and the service costs nothing. For most beneficiaries, spending an hour with a SHIP counselor before choosing between Plan N and Plan G is one of the most financially valuable hours you can spend.