By Victor Sterling, MS, CHDA | Certified Health Data Analyst & Actuarial Pricing Arbitrator
Specialization: Medicare Supplement Standardization (42 U.S.C. § 1395ss), Part B Excess Charge Forensics & Rate Trend Actuarial Modeling
The Actuarial Bottom Line
Plan G delivers complete peace of mind, but Plan N frequently protects your net lifetime wealth better. Both plans cover 100% of the Medicare Part A hospital deductible and 100% of skilled nursing coinsurance. The difference comes down to three operational items: Plan N requires up to a $20 copay per office visit, up to a $50 emergency room copay, and does not cover Part B Excess Charges. In exchange, Plan N premiums are typically $30 to $50 cheaper per month ($360 to $600 annually), and its historical rate increase trends are noticeably more stable over time.
When transitioning into Original Medicare (Part A and Part B), retirees quickly learn that standard Medicare leaves major financial gaps: a steep Part A hospital deductible per benefit period, unlimited 20% Part B outpatient coinsurance, and no statutory out-of-pocket maximum ceiling. To insulate themselves against catastrophic medical debt, millions purchase a private Medicare Supplement Insurance (Medigap) policy.
Because federal law prohibited newly eligible Medicare beneficiaries from purchasing Plan F (which covered the annual Part B deductible), two plans have dominated the market: Plan G and Plan N.
Commercial marketing pitches often portray this decision as a simple binary choice: pay more for Plan G to never see a doctor bill, or pay less for Plan N and juggle copayments. In practice, choosing between these two standardized policies requires understanding federal payment regulations, billing rules in your state, and the demographic risk pools that drive long-term premium inflation.
1. The Standardization Mandate: Why Brand Names Don’t Alter Benefits
Under Section 1882 of the Social Security Act (42 U.S.C. § 1395ss), Medigap plans are strictly standardized by the federal government and state insurance commissioners. Every lettered plan offers identical statutory benefits regardless of whether you purchase it from Mutual of Omaha, Aetna, Cigna, Blue Cross Blue Shield, or a regional provider.
A Plan G in Tampa, Florida provides the exact same coverage as a Plan G in Boise, Idaho. The insurance carrier cannot alter coinsurance rates, change deductible obligations, or add restrictive doctor networks. If a physician or hospital accepts Original Medicare, they must accept your Medigap policy by federal statute.
2. Direct Actuarial Breakdown: Plan G vs. Plan N
To evaluate where your dollars go, compare the exact legal benefit differences codified under CMS guidelines:
Regulatory Benefit Matrix: Medigap Plan G vs. Plan N
| Statutory Medicare Benefit | Medicare Supplement Plan G | Medicare Supplement Plan N |
|---|---|---|
| Part A Hospital Deductible & Coinsurance | 100% Covered (Plan pays all facility costs) | 100% Covered (Plan pays all facility costs) |
| Skilled Nursing Facility Coinsurance | 100% Covered (Days 21–100 paid in full) | 100% Covered (Days 21–100 paid in full) |
| Hospice Care Coinsurance | 100% Covered | 100% Covered |
| Foreign Travel Emergency Care | 80% Covered (Up to $50,000 lifetime cap) | 80% Covered (Up to $50,000 lifetime cap) |
| Part B Outpatient Coinsurance (20%) | 100% Covered (Zero out-of-pocket copays) | Covered with copays (Up to $20/visit; up to $50/ER) |
| Annual Part B Deductible | NOT Covered (Beneficiary pays standard base) | NOT Covered (Beneficiary pays standard base) |
| Part B Excess Charges | 100% Covered | NOT Covered (Beneficiary pays up to 15%) |
| Average Monthly Premium Range | Higher ($140 – $220 / month) | Lower ($100 – $165 / month) |
3. Demystifying the Cost Drivers: Copays and Excess Charges
When financial advisors evaluate whether Plan N saves money over Plan G, they look at two variables: office visit copays and Part B Excess Charges.
1. The Plan N Copay Structure ($0 to $20)
On Plan N, outpatient copayments are strictly bounded:
- Up to $20 Copay: Applies only to doctor visits that result in an evaluation and management (E&M) coding charge. If you visit a clinic solely for physical therapy, lab draws, injections, or routine diagnostic imaging, your copay is $0.
- Up to $50 ER Copay: Billed only if you visit an emergency room and are not formally admitted as an inpatient. If you are admitted to the hospital, the $50 fee is waived.
- Urgent Care Clinics: Urgent care centers do not carry the $20 copay; they are covered at 100% by Plan N.
2. The Part B Excess Charge Reality
Under federal law (42 U.S.C. § 1395u(j)), doctors who treat Medicare patients fall into two categories: Participating Providers (who accept Medicare assignment and agree to standard Medicare fee schedules) and Non-Participating Providers. Non-participating doctors can legally bill up to 15% above the Medicare-approved amount—an assessment known as an Excess Charge.
While Plan G pays 100% of these excess charges and Plan N leaves them to you, their actual financial risk is often misunderstood:
- Over 96% of physicians and healthcare practitioners nationwide participate in Medicare and accept assignment, meaning they cannot legally levy excess charges under any circumstance.
- Eight states completely outlaw Part B Excess Charges by state statute under the MOM Rule (Medicare Overcharge Measure): Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island, and Vermont. If you reside in one of these states, excess charges are legally prohibited.
4. The Actuarial Secret: Rate Increase Trajectories Over Time
The biggest financial danger in choosing a Medigap plan is not what you pay at age 65, but what you will pay at age 75 or 82.
Because Plan G covers every single copay and excess charge, it acts as a commercial magnet for consumers who anticipate high medical utilization. As this cohort ages and utilizes extensive outpatient procedures, the insurer’s loss ratios increase. To remain solvent, carriers file for annual rate hikes of 7% to 12% on Plan G.
Conversely, Plan N’s small $20 copay requirement deters frivolous medical visits and attracts a younger, healthier demographic. Historically, Plan N rate increases trend at a much lower 2% to 5% annually. A senior who saved $35 a month on Plan N at age 65 often finds themselves saving over $100 a month compared to Plan G ten years later.
5. Case Study: Running the 10-Year Breakeven Math
To see how the numbers perform in the real world, examine a comparison for a 65-year-old enrollee:
Enrollee Profile: 65-year-old retired teacher, non-smoker, visiting primary and specialist doctors 8 times per year.
- Plan G Premium: $160/month ($1,920/year). Zero copays. Total annual out-of-pocket (excluding Part B deductible) = $1,920.
- Plan N Premium: $115/month ($1,380/year). Premium savings = $540/year.
- Plan N Utilization: 8 doctor visits × $20 maximum copay = $160 in annual copayments. Zero excess charges incurred.
- Net Annual Financial Result: Plan N total cost = $1,540. Plan N saves $380 in cash every single year ($1,920 − $1,540).
To wipe out the premium savings of Plan N, this policyholder would have to visit specialist physicians more than 27 times per year every year.
The Bottom Line
Both Medigap Plan G and Plan N provide reliable, comprehensive protection against unpredictable medical debt, granting you access to any Medicare-accepting doctor or hospital across the United States without pre-authorization hurdles or restrictive HMO networks. If you want zero administrative paperwork and do not want to carry a checkbook or credit card to doctor appointments, Plan G provides that convenience. But if you are comfortable paying an occasional $20 copay, live in a state that bars excess charges, and want to insulate your retirement savings against compounding double-digit premium hikes as you age, Plan N is often the superior long-term financial choice.