If you've been shopping for a Medicare Supplement plan and noticed that Plan N premiums are noticeably lower than Plan G, you're not imagining things — and you're right to wonder what the catch is. Plan N is a legitimate, standardized Medigap policy that covers most of your major out-of-pocket costs under Original Medicare, but it comes with a few specific gaps that can cost you real money depending on how you use healthcare. Understanding exactly where those gaps are, and whether they matter for your situation, is the difference between a smart financial decision and an expensive surprise.
Medigap Plan N covers Medicare Part A coinsurance and hospital costs, Part A hospice care coinsurance, skilled nursing facility coinsurance, Part A deductible (which is $1,676 per benefit period in 2025), Part B coinsurance for most services, and the first three pints of blood. What it does not cover is the Medicare Part B deductible ($257 in 2025) or Medicare Part B excess charges. Those two exclusions are the defining features of Plan N, and they're what separates it from the more comprehensive Plan G. In exchange for accepting those gaps, beneficiaries typically pay premiums that run $30 to $80 less per month than comparable Plan G policies — a savings of $360 to $960 per year depending on your age, location, and the insurer you choose.
The cost-sharing structure inside Plan N is worth understanding in detail. When you visit a doctor's office, Plan N requires you to pay a copayment of up to $20. When you visit an emergency room and are not admitted to the hospital, you pay a copayment of up to $50. If you are admitted as an inpatient following that ER visit, the $50 copay is waived. These copays apply after Medicare has paid its share. For someone who sees their primary care doctor four times a year and rarely visits the ER, the annual out-of-pocket exposure from these copays might be $80 or less — far below the premium savings Plan N provides compared to Plan G. But for someone managing multiple chronic conditions who sees several specialists monthly, those $20 copays can add up to several hundred dollars annually, narrowing the premium advantage considerably.
The excess charge issue deserves special attention because it's the risk that catches people off guard most often. Medicare Part B excess charges occur when a physician or provider does not accept Medicare assignment — meaning they haven't agreed to accept Medicare's approved payment rate as payment in full. These providers are legally permitted to charge up to 15% above the Medicare-approved amount for their services. Plan N does not cover that 15% overage, which means you pay it directly. In practice, the financial exposure depends entirely on which doctors you see. If all your physicians are Medicare-participating providers (which the vast majority are — roughly 97% of non-pediatric physicians accept Medicare assignment according to CMS data), excess charges will never affect you. But if you see a specialist who doesn't accept assignment — certain surgeons, anesthesiologists, or physicians at academic medical centers sometimes fall into this category — a single procedure could generate an excess charge of several hundred dollars.
Several states have actually solved the excess charge problem by law. Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island, and Vermont either prohibit excess charges outright or have regulations that effectively eliminate them. If you live in one of these states, the fact that Plan N doesn't cover excess charges is essentially irrelevant — no provider in your state can legally bill you that extra 15%. For residents of those states, Plan N becomes an even more attractive option because one of its two main limitations simply doesn't apply. Before enrolling, it's worth calling your state insurance department or checking Medicare's Physician Compare tool at medicare.gov to verify whether your specific doctors accept Medicare assignment.
Comparing Plan N to Plan G side by side helps clarify who each plan serves best. Plan G covers everything Plan N covers, plus it covers excess charges. Plan G does not cover the Part B deductible either — that's a common misconception. Both Plan N and Plan G require you to pay the $257 Part B deductible in 2025 before coverage kicks in for outpatient services. The real distinction is excess charges and the office visit copays. If you're comparing a Plan G premium of $180 per month to a Plan N premium of $130 per month for the same age and zip code, you're saving $600 per year with Plan N. To come out behind financially, you'd need to accumulate more than $600 in excess charges and office visit copays in a single year — which is possible but not typical for most beneficiaries.
Enrollment timing matters significantly for Plan N, just as it does for all Medigap policies. Your best opportunity to enroll without medical underwriting is during your Medigap Open Enrollment Period, which begins the month you turn 65 and are enrolled in Medicare Part B, and lasts for six months. During this window, insurers cannot deny you coverage or charge you higher premiums based on your health history. Outside of this window, most states allow insurers to use medical underwriting, which means pre-existing conditions like diabetes, heart disease, or COPD could result in higher premiums or outright denial. If you're past your initial enrollment window and want to switch to Plan N from a different Medigap plan, you'll generally need to pass medical underwriting unless you qualify for a Special Enrollment Period — such as losing employer coverage or your current insurer leaving the market.
If you live in one of the birthday rule states — California, Idaho, Illinois, Kentucky, Louisiana, Maine, Maryland, Missouri, Nevada, New Jersey, New York, Oklahoma, or Oregon — you have an additional annual window to switch Medigap plans without medical underwriting. This 30-day window opens on your birthday each year and allows you to move to a plan with equal or lesser benefits without answering health questions. For someone currently on Plan G who wants to move to Plan N to reduce premiums as they age and their health remains stable, the birthday rule window can be a valuable tool.
Premium pricing for Plan N varies considerably by insurer even for identical coverage, because Medigap plans are standardized by the federal government — every Plan N offers the same benefits regardless of which company sells it — but premiums are set by each insurer independently. A 65-year-old woman in Dallas might find Plan N premiums ranging from $95 to $160 per month depending on the carrier. That $65 monthly spread represents $780 per year for identical coverage. This is why comparison shopping through your State Health Insurance Assistance Program (SHIP) counselor or a licensed independent broker is worth the time. SHIP counseling is free and available in every state — you can find your local SHIP at shiphelp.org.
One practical consideration that often gets overlooked: Plan N's copay structure means you'll have small, predictable out-of-pocket costs at the point of care rather than zero costs. For some people, this is psychologically uncomfortable even if it's financially rational. If you're the type of person who would delay or avoid a doctor's visit because of a $20 copay, Plan N may not serve your health interests well regardless of the premium savings. The best insurance plan is one you'll actually use when you need it. For beneficiaries who are comfortable with modest cost-sharing and want to keep monthly premiums as low as possible while still having comprehensive hospital coverage and protection from catastrophic costs, Plan N represents a genuinely solid option in the Medigap lineup.