Medigap Plan N: Lower Premiums, Real Trade-Offs You Must Know

If you're shopping for a Medicare Supplement plan and your eyes keep drifting to the monthly premium column, Medigap Plan N is probably already on your radar. It consistently offers some of the lowest premiums among the standardized Medigap plans — often $50 to $100 per month less than the popular Plan G, depending on your age, gender, tobacco use, and ZIP code. That's real money: $600 to $1,200 a year back in your pocket. But Plan N comes with trade-offs that aren't always explained clearly at the point of sale, and for some beneficiaries, those trade-offs can quietly erase the premium savings — or worse, leave them exposed to bills they didn't see coming.

Let's start with what Plan N actually covers, because it's genuinely comprehensive in most areas. In 2025 and 2026, Plan N covers the Medicare Part A hospital coinsurance and all hospital costs up to an additional 365 days after Medicare benefits are exhausted. It covers the Part A deductible, which is $1,676 per benefit period in 2025. It covers skilled nursing facility coinsurance, Part A hospice care coinsurance, and the first three pints of blood. On the Part B side, Plan N covers the Part B coinsurance — but with an important exception: you'll pay a copay of up to $20 for office visits and up to $50 for emergency room visits that don't result in a hospital admission. Plan N does not cover the Part B deductible, which is $257 in 2025, meaning you pay that out of pocket each year before Plan N kicks in for outpatient costs.

Now here's the trade-off that catches people off guard most often: Plan N does not cover Part B excess charges. This is the single biggest financial risk hiding inside Plan N's otherwise solid coverage. Under federal law, doctors who have opted out of Medicare assignment — meaning they haven't agreed to accept Medicare's approved payment rates as payment in full — can charge up to 15% above what Medicare approves. If Medicare approves $500 for a procedure and your doctor charges the maximum excess, you owe $575. Plan N leaves that $75 entirely on you. For a single specialist visit that might be manageable. But if you're seeing multiple specialists, having procedures, or living in a metro area where a higher percentage of physicians opt out of Medicare assignment, those excess charges can accumulate into hundreds or even thousands of dollars annually. 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 assignment status at Medicare.gov using the physician compare tool.

So who does Plan N actually make sense for? The financial math tends to work in your favor if you're relatively healthy, visit the doctor fewer than six or seven times a year, use emergency rooms rarely, and have confirmed that all your regular providers accept Medicare assignment. Consider a 67-year-old woman in a mid-sized city paying $95 per month for Plan N versus $155 for Plan G — a $60 monthly difference. If she has four office visit copays at $20 each in a year, she's paid $80 in copays but saved $720 in premiums. She comes out $640 ahead. But if she has a year with frequent specialist visits — say, ten office visits — her copay exposure rises to $200, and her net savings drop to $520. Still ahead, but the margin narrows. The calculus shifts further if any of those providers charge excess fees.

Plan N is often compared directly to Plan G, which is currently the most popular Medigap plan sold to new Medicare enrollees. Plan G covers everything Plan N covers, plus it eliminates the office visit and ER copays and — critically — it does cover Part B excess charges. The only thing Plan G doesn't cover is the Part B deductible ($257 in 2025), same as Plan N. So the real comparison between Plan N and Plan G comes down to this: are the premium savings from Plan N greater than the copays and potential excess charges you'll actually incur? For healthy, low-utilization beneficiaries, Plan N often wins. For people managing chronic conditions, seeing multiple specialists, or living in areas with high rates of non-participating physicians, Plan G's broader protection frequently justifies the higher premium.

One thing many beneficiaries don't realize is that Medigap plans are standardized by the federal government — meaning a Plan N sold by Aetna covers exactly the same benefits as a Plan N sold by Mutual of Omaha or Blue Cross Blue Shield. The only differences between carriers are the premium price, the company's financial stability rating, and their history of rate increases. This matters enormously over time. A carrier that offers a rock-bottom Plan N premium at age 65 but raises rates aggressively every year can end up costing you significantly more by age 75 than a carrier that started slightly higher but held rates steadier. When comparing Plan N quotes, ask each carrier for their rate increase history over the past five years — a reputable agent or the carrier itself should be able to provide this.

Enrollment timing is another area where costly mistakes happen. The best time to enroll in any Medigap plan, including Plan N, 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 more based on pre-existing health conditions — it's guaranteed issue. Once that window closes, most states allow insurers to use medical underwriting, meaning they can reject your application or charge higher premiums based on your health history. If you're past your initial enrollment window and want to switch from one Medigap plan to another, you'll generally need to pass medical underwriting unless you qualify for a Special Enrollment Period — such as losing employer coverage or your current plan leaving the market.

A handful of states offer additional protections worth knowing about. If you live in California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, or Oregon, you may have a birthday rule that gives you a 30-day window each year around your birthday to switch Medigap plans without medical underwriting. New York and Connecticut go further, offering year-round guaranteed issue for Medigap plans regardless of health status. If you're in one of these states and currently in a higher-premium plan, it may be worth exploring whether you can move to Plan N during your birthday window and capture those premium savings without health screening.

Finally, a word about the long game. Medigap Plan N is not a set-it-and-forget-it decision. Your health changes, your provider relationships change, and plan premiums change. It's worth reviewing your Medigap coverage annually — not just during Medicare's Annual Enrollment Period (October 15 through December 7, which applies to Medicare Advantage and Part D, not Medigap), but whenever your health situation or financial circumstances shift meaningfully. If you find yourself using healthcare more frequently, accumulating copays, or discovering that a new specialist doesn't accept Medicare assignment, that's a signal to re-run the numbers. A licensed independent insurance agent who works with multiple Medigap carriers — not a captive agent who sells only one company's products — can pull current quotes and help you model the actual cost comparison based on your real utilization patterns.