Medigap Plan G vs Plan N and the Six Month Choice Window
Plan G covers nearly all Medicare costs while Plan N trades lower premiums for copays. Learn how to compare the math and protect your guaranteed issue rights.
Choosing Medicare supplemental insurance often feels needlessly complex. Yet behind dozens of commercial carrier brands lies a remarkably tidy federal architecture. Medigap policies are standardized by the federal government and identified by letters: Plan A through Plan N. Every insurance carrier selling Plan G must provide the exact same core benefits as any other carrier selling Plan G. The only difference is the monthly premium price and customer service responsiveness. In modern retirement planning, the contest has narrowed down to two frontrunners: Plan G and Plan N.
Both plans offer extraordinary financial security, allowing you to see any physician in the United States who accepts Medicare with zero network restrictions. Deciding between them requires comparing monthly premium savings against per-visit copayments, understanding excess charges, and protecting your guaranteed issue rights during your initial enrollment window.
What standardized Medigap plans cover
Original Medicare leaves substantial financial gaps. Medicare Part A carries a steep hospital deductible for each benefit period, alongside daily copayments for prolonged hospitalizations. Medicare Part B requires an annual deductible, followed by a twenty percent coinsurance on all outpatient medical services without any annual limit.
Medigap (Medicare Supplement) policies exist to absorb these deductibles, copayments, and coinsurance obligations. Because the federal government standardized Medigap benefits under the Omnibus Budget Reconciliation Act of 1990, an insurance company cannot modify what a plan covers. A Plan G sold by Mutual of Omaha pays the exact same medical bills as a Plan G sold by Aetna, Cigna, or Blue Cross Blue Shield.
Plan G against Plan N line by line
Since federal regulations prohibited the sale of Plan F (which covered the Part B deductible) to newly eligible beneficiaries in 2020, Plan G and Plan N have become the dominant options for retirees.
| Medicare Benefit Component | Medigap Plan G Coverage | Medigap Plan N Coverage |
|---|---|---|
| Part A Hospital Deductible ($1,676/benefit period) | Covered 100% | Covered 100% |
| Part A Hospital Daily Coinsurance | Covered 100% | Covered 100% |
| Part B Medical Coinsurance (20%) | Covered 100% | Covered 100% (minus office/ER copays) |
| Annual Part B Deductible ($257) | Paid by Policyholder | Paid by Policyholder |
| Doctor Office Visit Copayments | $0 Copay | Up to $20 Copay per visit |
| Emergency Room Copayments | $0 Copay | Up to $50 Copay (waived if admitted) |
| Part B Excess Doctor Charges | Covered 100% | Paid by Policyholder |
| Foreign Travel Emergency Care | 80% (up to $50,000 lifetime) | 80% (up to $50,000 lifetime) |
Examine the table closely. Under Plan G, once you pay the small annual Part B deductible ($257 in 2026), you have one hundred percent medical coverage. You will never pay a copay for a doctor visit, specialist appointment, emergency room visit, outpatient surgery, or chemotherapy infusion.
Under Plan N, coverage is virtually identical, with three specific exceptions:
- You pay a copay of up to $20 for physician office visits (evaluations and consultations).
- You pay a copay of up to $50 for emergency room visits (waived immediately if admitted to the hospital).
- You are responsible for Part B excess charges if a physician bills them.
The mathematical break even in annual doctor visits
Because Plan N requires policyholders to share in minor copayment costs, insurance carriers price Plan N premiums significantly lower than Plan G. In most geographic regions, Plan N costs $30 to $50 less per month ($360 to $600 per year) than Plan G for a sixty-five-year-old applicant.
This premium delta creates a straightforward mathematical break-even calculation:
Consider an applicant who receives two quotes from a top-rated carrier:
- Plan G Premium: $180 per month ($2,160 per year)
- Plan N Premium: $135 per month ($1,620 per year)
- Annual Premium Savings with Plan N: $540 per year
To determine if Plan G is worth the higher premium, divide the $540 annual premium savings by the maximum $20 doctor office visit copay: $540 divided by $20 equals 27 doctor visits.
Under these numbers, the retiree would have to visit a medical doctor more than twenty-seven times in a single calendar year before Plan G becomes cheaper than Plan N. The average American retiree visits a physician between four and seven times annually. If you make six office visits in a year under Plan N, you pay $120 in copays ($20 multiplied by 6). Subtracting $120 from your $540 premium savings leaves you with a net profit of $420 in your pocket.
What about Part B excess charges?
Many seniors hesitate to choose Plan N because it leaves them exposed to Part B excess charges. An excess charge occurs when a doctor accepts Medicare patients but refuses to accept Medicare assignment (the standardized payment rate). By federal law, such physicians are permitted to bill up to fifteen percent above the approved Medicare amount.
In practice, excess charges are extraordinarily rare:
- Over ninety-six percent of physicians in the United States accept Medicare assignment and are legally prohibited from billing excess charges.
- Eight states (Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island, and Vermont) completely ban excess charges by state statute under Medicare MOM laws.
- Doctors who do not accept assignment are legally required to inform you in advance. You can easily ask the scheduling desk: "Does your practice accept Medicare assignment?" If they say yes, an excess charge is impossible.
The six month Medigap open enrollment period
Your ability to choose freely between Plan G and Plan N is protected by a strict federal timeline. Your Medigap Open Enrollment Period lasts for exactly six months, beginning on the first day of the month in which you are both age sixty-five or older and enrolled in Medicare Part B.
During this six-month window, you possess guaranteed issue rights. Private insurance companies cannot review your medical history, cannot decline your application due to previous heart attacks, cancer, or diabetes, and cannot charge you one dollar more than a marathon runner of the same age and gender.
Once this six-month window closes, guaranteed issue protection expires in forty-six states. If you enroll in Plan N at age sixty-five and subsequently develop severe chronic medical conditions at age seventy-two, you cannot freely upgrade to Plan G. The carrier will require medical underwriting, review your prescription history, and likely reject your application.
Rating methods that change your premium at age eighty
When shopping for either Plan G or Plan N, the monthly quote on your sixty-fifth birthday tells only part of the story. You must check how the insurance company structures its pricing over time. Insurers use one of three rating methods:
- Community-Rated (No-Age-Rated): Everyone residing in the same geographic zip code pays the same base premium, regardless of whether they are sixty-five or eighty-five. Premiums increase only due to broader healthcare inflation, making this the most stable long-term pricing model.
- Issue-Age-Rated: Premiums are based on your age when you first buy the policy. Purchasing at age sixty-five locks in an entry tier, and your rate does not increase simply because you grow older chronologically.
- Attained-Age-Rated: Premiums are based on your current biological age and automatically increase each year on your birthday. While attained-age plans often advertise the cheapest quotes at age sixty-five, their rates escalate steeply in your late seventies and eighties.
Whenever practical, select community-rated or issue-age-rated policies to prevent aggressive premium inflation during your retirement years.
When Medigap supplement plans do not apply
Medigap plans are specifically designed to supplement Original Medicare fee-for-service and do not coordinate with other health systems:
- Medicare Advantage: Federal law makes it illegal for an insurer to sell you a Medigap policy if you are enrolled in a Medicare Advantage plan. Medigap cannot pay Advantage plan copays or deductibles.
- Employer retiree health insurance: If your former corporate or public employer provides comprehensive retiree group health coverage, purchasing a private Medigap policy creates redundant, overlapping expenses.
- Medicaid beneficiaries: Individuals qualifying for full state Medicaid coverage receive state cost-sharing assistance that makes Medigap redundant.
By comparing the doctor visit break-even threshold against quoted regional premiums, verifying carrier rating methods, and acting during your guaranteed six-month open enrollment window, you can choose the Medigap policy that perfectly balances low monthly overhead with lifetime catastrophic protection.
