Surprising fact: about one in four Medicare beneficiaries pays out-of-pocket for hospital and doctor extras each year, even with coverage—showing how quickly costs can add up.
This short guide explains how private medicare supplement insurance fills gaps in Original Medicare (Parts A and B). Lettered policies A–N are standardized, so a Plan G from one carrier matches the same benefits from another.
Plans C and F are mostly closed to new enrollees after 1/1/2020, so many shoppers focus on Plan G and Plan N. Plan N uses copays for some visits, while Plan G leaves only the Part B deductible as the main difference versus older options.
We’ll show how to compare total annual costs, predictability, and worst-case exposure—not just monthly premiums. Also learn why carrier choice matters (premiums, discounts, service) and how state rules and enrollment timing in 2026 can change what you can buy.
How to use this guide: start with gaps in Original Medicare, review standardization, then compare Plan G vs Plan N and consider alternatives like high-deductible or cost-sharing options. The goal is to help you narrow choices and shop confidently.
Key Takeaways
- Medicare supplement options are standardized; compare carriers for price and service.
- Plan G and Plan N are top choices for many, depending on budget and health needs.
- Focus on total yearly costs and worst-case exposure, not just premiums.
- Eligibility rules and state differences in 2026 can limit choices.
- Use Medicare tools by ZIP code to compare offerings near you.
Why Medigap matters in 2026 when you’re on Original Medicare
Certain gaps in Original Medicare can lead to large, unexpected bills. Part A covers inpatient hospital care, but you still owe a sizable part deductible and daily part coinsurance after long stays. These costs add up fast.
Part B generally pays 80% after you meet the Part B deductible. That leaves you responsible for 20% of many expensive services. There is no built-in out-of-pocket maximum under Original Medicare, so totals can climb for surgeries, imaging, or ongoing treatments.
How a supplemental policy helps
A medicare supplement policy steps in to cover some or all of those copays, coinsurance, and deductibles left by Medicare. That makes monthly budgeting easier and reduces the chance of a surprise bill.
- Predictable costs: Fewer high-dollar surprises at the hospital or doctor.
- Broad coverage: Many supplements pay Medicare-approved shares so you owe less at point of care.
- Choice: You can keep Original Medicare and limit out-of-pocket risk.
| Original Medicare Gap | Typical Exposure | What a Supplement May Pay | Why it matters |
|---|---|---|---|
| Part A deductible | One-time hospital deductible per stay | Full or partial deductible | Reduces big upfront hospital bills |
| Hospital coinsurance | Daily coinsurance after day limits | Daily coinsurance covered on many supplements | Prevents extended-stay costs |
| Part B cost-sharing | 20% after part deductible; no cap | Plan pays some or all of the 20% | Protects against high-cost outpatient care |
What a Medigap (Medicare Supplement) plan is and what it doesn’t cover
A medicare supplement is private insurance that coordinates with Original Medicare to pay some or all of the cost sharing from Part A and Part B. It reduces copays, coinsurance, and many deductibles so you face fewer surprise bills at the doctor or hospital.
How it works with Part A and Part B — and why it won’t work with Medicare Advantage
Medicare supplement coverage only works when you keep Original Medicare (Parts A and B). You buy the supplement from a private carrier and Medicare pays first; the supplement pays its share afterward.
You generally must choose between Original Medicare + a supplement or enrolling in a Medicare Advantage product. A supplement will not pay cost sharing for medicare advantage plans or replace that type of coverage.
Common exclusions to plan for
A supplement is focused on medical cost sharing. It usually does not cover:
- Long-term care or custodial nursing home care.
- Most dental, vision, and hearing aids or eyeglasses.
- Private-duty nursing and many non-medical services.
- Prescription drugs — Part D is separate.
Practical next steps: if dental, vision, or long-term care matter, budget separately or buy standalone policies. Use a supplement to reduce Medicare-approved medical expenses, not to cover every retirement need.
How standardized Medigap plans work across insurance companies and states
When you shop by letter, the actual coverage stays the same; what changes is who sells it and how much they charge. That makes comparing options straightforward: match the lettered benefits, then compare price and service.
Same benefits, different pricing
All carriers must offer identical benefits for a given letter, so a benefits plan labeled with the same letter provides the same coverage across companies. That means you can compare apples to apples on coverage and focus on the insurance company reputation, rate stability, and extra discounts.
Why do monthly premiums vary for the same lettered plan? Companies set prices based on their risk models, local competition, age or tobacco status of applicants, and underwriting rules when applicable.
State exceptions you should check
Most states follow the A–N standard, but three states use different systems. Massachusetts, Minnesota, and Wisconsin have their own structure and may list equivalent benefits under different names.
- Confirm what equivalent coverage looks like in your state.
- Always check which plans available in your ZIP code and whether local rules affect switching rights.
Shopping tip: pick the lettered coverage you want, then compare quotes from multiple insurance company carriers to find the best combination of price and service. Understanding standardization makes the upcoming Plan G vs Plan N comparison much clearer and helps you avoid overpaying for marketing instead of benefits.
Best Medigap plans to consider for 2026: quick comparison of top options
Here’s a quick menu of commonly chosen supplement letters and what they actually cover.
High-coverage picks
Plan G is popular because it mirrors older high-coverage options while excluding only the Part B deductible. It limits surprise bills for hospital and outpatient care.
Plan F offers very broad coverage but is available only to those who were eligible for Medicare before 1/1/2020.
Value-focused option
Plan N tends to have lower monthly premiums with modest copays: up to $20 for some office visits and up to $50 for certain emergency room visits after the Part B deductible is met.
Budget cost-sharing choices
Plans K and L trade richer first-dollar coverage for lower premiums and an annual out-of-pocket limit. In 2025 those limits were $7,220 (K) and $3,610 (L); confirm 2026 figures when you shop.
Lower-premium basics
Plan A covers core benefits with lower premiums. Plan B adds the Part A deductible but still leaves more cost at point of care compared with higher-rated letters.
How to use this comparison: pick 2–3 letters that match your risk tolerance and expected use. Then compare carriers and pricing in your ZIP code to find the best mix of price and service.
| Category | Examples | Key tradeoff | Who it suits |
|---|---|---|---|
| High coverage | Plan G, Plan F* | Higher premiums, lower surprise bills | Frequent users of care or risk-averse buyers |
| Value | Plan N | Lower premiums, office/ER copays | Those who want savings and accept small copays |
| Budget cost-sharing | Plan K, Plan L | Lower premiums, annual OOP limits | Healthy retirees seeking lower monthly cost |
| Basics | Plan A, Plan B | Lowest premiums, more out-of-pocket when used | Light users willing to pay deductibles when needed |
Plan G vs Plan N in 2026: which Medicare supplement plan fits your budget and care needs?
Choosing between Plan G and Plan N often boils down to two questions: how many doctor visits do you expect, and do you mind occasional copays or want bills to stop at the counter?
Coverage differences: excess charges, copays, and who pays what
Plan G covers Part B excess charges where allowed. Excess charges occur when a provider doesn’t accept Medicare assignment and bills up to 15% above the Medicare-approved amount (in states that permit it).
Plan N does not cover excess charges. Instead, it uses small copays—commonly up to $20 for office visits and up to $50 for some ER visits after the Part B deductible—so monthly premiums can be lower.
Cost trade-offs: predictable monthly costs vs lower premiums
Plan G gives more predictable out-of-pocket exposure for outpatient care. You pay higher monthly premiums and fewer surprise bills.
Plan N lowers monthly premiums but introduces point-of-care costs. That makes it attractive if you expect light utilization.
Who tends to prefer each option
- Often choose Plan G: people with frequent visits, specialists, or a desire to avoid bills after appointments.
- Often choose Plan N: healthier retirees who want lower premiums and accept copays when care is used.
“Because benefits are standardized, pick the lettered coverage first, then shop carriers for the best price and service.”
| Feature | Plan G | Plan N |
|---|---|---|
| Part B excess charges | Covers | Does not cover |
| Copays for visits | No routine copays | Up to $20 office / $50 ER (example) |
| Who it fits | Frequent doctor users | Lower-use, cost-conscious buyers |
Shopping reminder: check if your state bans excess charges (for example CT, MA, MN, NY, OH, PA, RI, VT). That rule can reduce the value difference between these two options. Estimate yearly visits, consider specialist use, then decide whether steady monthly costs or smaller premiums plus copays suit you best.
Understanding Plan F, Plan C, and eligibility rules after 2020
Since 2020, some supplemental options that paid the Part B deductible are closed to most newly eligible beneficiaries. If you first became eligible for Medicare on or after January 1, 2020, you generally cannot buy policies that cover that deductible.
Eligible here means the date you first qualified for Medicare, not the date you enrolled. That distinction matters when you check which offers you can legally buy.
Who can still buy Plans C and F
People who were eligible for Medicare before 1/1/2020 may still purchase coverage that includes the Part B deductible. For them, Plan F covers that deductible while Plan G does not.
- Compare the extra monthly cost of Plan F to the Part B deductible amount for the year (example: $257 in 2025).
- If the premium gap over a year exceeds the deductible, Plan G may be the cheaper choice even with the annual outlay.
- As fewer people remain eligible for Plan F, premiums may rise over time due to a smaller risk pool.
| Rule | Applies if you were eligible before 1/1/2020 | Applies if you were eligible on/after 1/1/2020 | Practical tip |
|---|---|---|---|
| Can buy Plan F or C | Yes | No | Check your first-eligibility date before requesting quotes |
| Part B deductible covered | Covered by Plan F/C | Not covered by available options | Compare premium difference to deductible amount |
| Long-term pricing risk | Higher risk of premium increases | Not applicable | Factor shrinking pool into decisions |
Plans D and M: strong alternatives when you want different coverage for excess charges and Part A costs
If you want coverage between high-end and budget options, consider Plans D and M. They act as middle-path choices for many shoppers.
What Plan D offers
Plan D provides broad medicare supplement coverage similar to Plan G for hospital and outpatient gaps. However, it does not cover Part B excess charges where those charges are allowed.
Buyer cue: if your state bans excess charges or your providers accept Medicare assignment, Plan D often functions much like Plan G in real life.
How Plan M changes the trade-off
Plan M lowers premiums by sharing the Part A deductible — it covers half of that deductible. That reduces monthly costs but adds some hospital deductible risk if you’re admitted.
- Good if you want meaningful supplement coverage with lower premiums.
- Works when you can absorb part of an upfront hospital deductible.
“Compare total yearly costs: premium savings versus the chance you’ll owe part of the deductible.”
| Feature | Plan D | Plan M |
|---|---|---|
| Part B excess charges | Not covered | Not covered |
| Part A deductible | Covered | Covers half |
| Who it suits | Those avoiding higher premiums where excess charges are rare | Buyers wanting lower premiums and accepting some hospital cost |
Plan K and Plan L: how the out-of-pocket limit changes the value equation
Some supplement choices replace full first-dollar coverage with cost sharing and a calendar-year limit — that’s the core idea behind Plans K and L. These two letters are unique because they add a defined out-of-pocket ceiling for certain covered services.
How the cost sharing works
Plan K pays about 50% of some coinsurance items while you pay the rest. Plan L covers roughly 75%, leaving a smaller share to you.
That split applies to many Part A and Part B cost items until you hit the yearly limit. You pay more at the point of care, but monthly premiums are lower.
What happens after you hit the annual out-of-pocket limit
Once the plan’s calendar-year out-of-pocket ceiling is reached, the supplement pays 100% of covered services for the rest of that year.
Example 2025 limits: K = $7,220 and L = $3,610. Premiums continue, but you no longer owe those shared amounts for covered items after the cap.
- Why they matter: These letters set a hard risk ceiling, making big medical years less open‑ended.
- How to decide: Weigh annual premium savings against how quickly you might hit the limit in a moderate or high-utilization year.
- Who it fits: Budget-focused retirees who want lower monthly cost but also a defined pocket cap on covered spending.
“Compare likely yearly use: if you rarely hit the cap, K or L can save money; if you expect heavy care, fuller coverage may be cheaper over time.”
| Feature | Plan K | Plan L |
|---|---|---|
| Cost sharing level | Pays ~50% | Pays ~75% |
| 2025 OOP limit (example) | $7,220 | $3,610 |
| Who it suits | Lowest premiums, willing to share costs | Lower OOP ceiling, moderate premiums |
High-deductible Plan G: when lower premiums may beat richer coverage
What it is: a high-deductible version of Plan G requires you to pay a larger annual deductible before the supplement begins paying covered Medicare cost. Carriers offer this option to lower your regular premium in return for a higher up-front spend in a year you use care.
How the high deductible works
In practice you cover out-of-pocket expenses (excluding premiums) up to the deductible amount each calendar year. For example, the high-deductible version had an example deductible of $2,870 in 2025; that number can change by year.
Important: this deductible is separate from the Medicare Part B deductible and applies only to when the high-deductible supplement starts paying.
Who should consider it
Healthy retirees who rarely use services may prefer lower monthly premiums and accept self-funding routine care up to the deductible. The option functions as catastrophic protection: it limits very large bills after you hit the threshold.
- Confirm current year deductible before you buy.
- Compare annual premium savings versus the amount you’d likely pay if you use some care.
- Ensure emergency savings cover the deductible if needed.
“Choose this option when you want lower regular cost but still need a safety net against a high-cost medical year.”
| Feature | High-deductible Plan G | Standard Plan G |
|---|---|---|
| Annual deductible (example) | $2,870 (2025 example) | $0 |
| Monthly premiums | Lower | Higher |
| Best for | Healthy buyers wanting catastrophic coverage | Frequent users preferring predictable bills |
Pricing and shopping: what drives monthly premiums and total yearly cost
Compare what you pay each month with what you’d owe at the doctor, ER, or hospital to see true value.
What to add up
Start by totaling your expected yearly spend: the monthly premiums plus likely out-of-pocket items. Include the Part B deductible, any routine copays) or visit fees, and typical coinsurance percentages you might incur.
Add possible hospital exposure too: the Part A deductible or shares that a supplement letter leaves you responsible for.
Why identical letter coverage can cost more with one carrier
All carriers must match letter benefits, yet quotes vary. Differences come from the insurance company pricing model, age or tobacco rate classes, local competition, and underwriting rules where allowed.
Discounts, rate history, and how aggressively a carrier prices in your state also change the premium you see for the same letter.
Use Medicare tools and shop like a buyer
Practical steps: use Medicare’s online comparison to enter your ZIP, age, and gender to view price ranges and which plans are available locally.
- Calculate total yearly cost: premium + expected deductible + copays + coinsurance + potential hospital hits.
- Get quotes from at least three carriers for the same letter to avoid overpaying for identical benefits.
- Factor in carrier service quality and historical rate stability — don’t chase the lowest premium alone.
| What to compare | Example | Why it matters |
|---|---|---|
| Monthly premiums | What you pay every month | Core recurring cost |
| Out-of-pocket items | Part B deductible, copays, coinsurance | Drives point-of-care spending |
| Carrier differences | Discounts, underwriting, geography | Explains premium variation for same letter |
When to enroll or switch: Medigap open enrollment and guaranteed issue rights
Timing matters: certain windows give you guaranteed access to supplemental coverage without health questions. Your one-time six-month open enrollment starts the first month you have Part B and are age 65 or older. During this period insurers cannot underwrite you.
Your one-time six-month window
No underwriting means carriers can’t deny coverage or charge more for health history. This is usually the easiest and fairest time to buy a policy.
Guaranteed-issue rights within 63 days
If you lose other coverage, you often have 63 days to request protection. Insurers must sell at the lowest available rate and can’t impose pre-existing waiting periods in these cases.
Trial rights returning from Medicare Advantage
If you joined a Medicare Advantage plan when first eligible and leave within a year, or tried advantage and return to Original Medicare, trial rules can let you buy certain supplemental options without penalties.
State protections and switching windows
Some states give stronger rules: CT, MA, and NY allow year-round issue. Maine has an annual GI for Plan A; Minnesota’s annual protections start Aug 1, 2026. Several states offer birthday-rule switches (for example, California; Indiana adds a birthday rule in 2026).
- Action checklist: confirm whether you’re on Original Medicare or a Medicare Advantage plan, identify any qualifying event, and calendar your deadlines so you don’t lose guaranteed rights.
“Missing these windows can mean medical underwriting or higher premiums—shop when you have protected access.”
Conclusion
, Focus on two things: likely annual costs and which coverage stops surprise bills at the clinic or hospital.
Choose a lettered option, then compare carriers. For many people, Plan G gives broad protection while Plan N trades lower monthly cost for small copays. Consider K/L or a high-deductible G if you want a budget strategy that still limits big bills.
Shortlist two letters, estimate total yearly cost (premium + expected out-of-pocket), and use Medicare tools by ZIP to confirm availability and pricing. Because benefits are standardized, your main job is choosing the right letter and the best carrier for service and price.
If you’re near 65 or about to enroll in Part B, plan ahead for the six-month open enrollment window. Check guaranteed-issue and state rules before switching so you keep access without underwriting. Stay practical, compare, and buy with confidence.