ultimate-guide
Medicare Supplement Plans for Seniors: What to Know
Last Updated: October 25, 2026
Quick Summary
Medicare Supplement plans are private insurance that pays after Original Medicare, covering gaps like deductibles, coinsurance, and copayments. Plans are standardized by letter, so benefits are identical across carriers and only price and service vary. Medigap does not cover prescription drugs, dental, vision, hearing aids, or long-term care.
- In 2026, Medicare-covered costs can require up to $2,950 out of pocket before supplemental coverage takes over.
- Plan G is the most comprehensive plan available to newly eligible beneficiaries, covering nearly everything except the Part B deductible.
- Your six-month Medigap Open Enrollment Period begins the month you are 65 or older and enrolled in Part B.
- Outside open enrollment, most carriers use medical underwriting, which can lead to denial or higher rates.
- Frequent specialists and travelers usually favor Plan G, while budget-focused seniors in good health may prefer Plan N.
Table of Contents
- What Medicare Supplement Plans for Seniors Actually Cover
- How Medigap Plans Work With Original Medicare
- Medigap Plans Comparison Chart: Standardized Benefits Side by Side
- Medicare Supplement Plan Costs and What Moves Your Premium
- The Medigap Open Enrollment Period and Guaranteed-Issue Rights
- Medicare Supplement vs. Medicare Advantage: Two Different Trade-Offs
- State Rules, Underwriting, and Buying Outside Open Enrollment
- Choosing a Plan by Health Needs, Travel Habits, and Budget
- Schedule a No-Cost Plan Comparison With Carla Mills
- Frequently Asked Questions
What Medicare Supplement Plans for Seniors Actually Cover
Medicare Supplement plans for seniors fill the gaps that Original Medicare leaves behind: deductibles, coinsurance, and copayments. Supplemental Insurance According to Medicare's official plan comparison, Medicare-covered costs in 2026 can require beneficiaries to pay up to $2,950 out of pocket before supplemental coverage takes over. At Richland Group dba EnrollwithCarla.com, we walk clients through exactly which gaps each lettered plan closes, because the difference between Plan G and Plan N can be thousands of dollars a year in unexpected bills.
The Gaps in Original Medicare
Original Medicare pays its share, then hands you the rest. Part A carries a hospital deductible and daily coinsurance for extended stays. Part B covers 80% of approved medical costs, leaving you the other 20% with no cap. Those gaps are where Medigap steps in.
What Medigap Leaves Out
Medigap does not cover prescription drugs, dental, vision, hearing aids, or long-term care. You need a separate Part D plan for medications. This is the single most common misunderstanding we correct in consultations.
How Medigap Plans Work With Original Medicare
Medigap is private insurance that pays after Original Medicare processes your claim. You keep your Medicare Part A and Part B cards, see any provider who accepts Medicare, and the Medigap carrier pays its portion directly. No networks, no referrals, no prior authorization for covered services.
That provider freedom is the core selling point. Unlike Medicare Advantage, which operates through networks, Medigap follows you to any physician or hospital in the country that accepts Medicare assignment. For seniors who travel or split time between states, that flexibility matters more than the monthly premium.
Medigap Plans Comparison Chart: Standardized Benefits Side by Side
Medigap plans are standardized by letter under federal rules, so a Plan G from one carrier covers exactly what a Plan G from another covers. The official Medigap plan benefit comparison confirms the benefits are identical across insurers. Price, underwriting, and customer service become the only real variables, which is why the chart below is a starting point, not a shopping tool.
| Plan | Part A Coinsurance & Hospital Costs | Part B Coinsurance | Part A Deductible | Part B Deductible | Part B Excess Charges | Foreign Travel Emergency | Out-of-Pocket Limit |
|---|---|---|---|---|---|---|---|
| A | Covered | Covered | Not covered | Not covered | Not covered | Not covered | None |
| B | Covered | Covered | Covered | Not covered | Not covered | Not covered | None |
| C* | Covered | Covered | Covered | Covered | Covered | 80% | None |
| D* | Covered | Covered | Covered | Not covered | Not covered | 80% | None |
| F* | Covered | Covered | Covered | Covered | Covered | 80% | None |
| G | Covered | Covered | Covered | Not covered | Covered | 80% | None |
| K | 50% covered | 50% covered | 50% covered | Not covered | Not covered | 80% | $7,000 |
| L | 75% covered | 75% covered | 75% covered | Not covered | Not covered | 80% | $3,500 |
| M | Covered | Covered | 50% covered | Not covered | Not covered | 80% | None |
| N | Covered | Covered (copays apply) | Covered | Not covered | Not covered | 80% | None |
| High-Deductible G | Covered after deductible | Covered after deductible | Covered after deductible | Not covered | Covered after deductible | 80% | None |
*Plans C and F are closed to beneficiaries who first became eligible for Medicare on or after January 1, 2020. Plan D is closed to those first eligible on or after January 1, 2020 in most states. If you were eligible before those dates, you may still be able to buy them.
How to Read the Chart
Three columns do most of the work. Part A deductible is the hospital deductible you pay per benefit period, a figure that resets with each new spell of illness, not each calendar year. Part B coinsurance is the 20% of approved outpatient costs Original Medicare leaves you; every lettered plan covers it, but Plan N replaces it with copays of up to $20 for some office visits and up to $50 for emergency room visits that do not lead to admission. Part B excess charges only matter if you see a provider who does not accept Medicare assignment; Plan G and Plan F cover them, Plan N and most others do not.
Plan G, Plan N, and the High-Deductible Option
Plan G is the most comprehensive plan available to newly eligible beneficiaries, covering nearly everything except the Part B deductible. Plan N trades a lower premium for small copayments on office visits and emergency room trips and does not cover Part B excess charges. The high-deductible Plan G keeps premiums low in exchange for paying the first portion of costs yourself each year; the deductible amount is set annually and indexed, so confirm the current figure with the carrier before you budget.
What the Chart Does Not Show
Standardization covers benefits, not the fine print around them. Carriers can differ on how they handle claims, how quickly they pay, whether they offer household discounts, and how they rate future increases. The chart also does not show state variation: Massachusetts, Minnesota, and Wisconsin use their own standardized plan sets, and a few states add benefits or rules on top of the federal standard. If you live in one of those states, the letter you buy may not match the table above, check your state insurance department's Medigap guide before you shop.
Medicare Supplement Plan Costs and What Moves Your Premium
Premiums vary by carrier, age, tobacco use, and where you live, so no single figure applies to everyone. What we can tell you is that the same standardized benefits can carry meaningfully different price tags depending on how a carrier structures its rating. Request a personalized quote to see real numbers for your situation rather than a national average that does not reflect your county.
Community-Rated, Issue-Age-Rated, and Attained-Age-Rated Pricing
Three pricing methods drive long-term cost. Community-rated plans charge everyone the same rate regardless of age. Issue-age-rated plans lock in your price based on how old you were when you enrolled. Attained-age-rated plans rise as you age, which means the premium you see today is not the premium you will pay in ten years. That last structure is where household budgeting gets tricky.
The Medigap Open Enrollment Period and Guaranteed-Issue Rights
Your six-month Medigap Open Enrollment Period begins the month you are 65 or older and enrolled in Part B. During that window, insurers cannot deny you coverage, charge you more because of health history, or impose a waiting period for pre-existing conditions. That protection is one-time and does not repeat. Medicare FAQ Miss it, and medical underwriting can apply, which is why timing is the single most consequential decision in the Medigap buying process.
What Happens After the Window Closes
Outside open enrollment, most carriers use medical underwriting. In practice that means a health questionnaire, a review of prescription history through databases such as the MIB, and sometimes a phone interview. A carrier may decline you for a controlled condition, approve you at a higher rate, or approve you with a condition exclusion. The specific conditions that trigger decline vary by carrier and state, so the same diagnosis that blocks one application may be accepted by another. This is the part of the market most guides skip, and it is the reason a policy you can buy today is not automatically a policy you can replace next year.
Federal Guaranteed-Issue Rights
Federal rules require carriers to sell you certain Medigap plans without underwriting in specific situations. The most common include:
- Your Medicare Advantage plan is leaving the Medicare program or stops serving your area.
- Your Medicare Advantage plan reduces its provider network or changes cost-sharing in a way that affects you.
- You move out of your Medicare Advantage plan's service area.
- You joined a Medicare Advantage plan or Part D plan when you first became eligible, and you decide within the first 12 months to switch to Original Medicare.
- Your employer or union group health plan coverage ends.
- A Medicare SELECT policy you bought is terminated.
Each right comes with a deadline, typically 63 days from the triggering event, and the right usually applies only to certain plan letters. Confirm the exact window and eligible plans with your State Health Insurance Assistance Program (SHIP) before you act.
State Rules Can Be Stronger Than Federal Rules
A handful of states add their own guaranteed-issue protections. New York, Connecticut, Massachusetts, and Maine, for example, have rules that limit or prohibit Medigap underwriting in certain circumstances, and California and Oregon have birthday rules that give residents a annual window to switch plans with reduced underwriting. Because these rules change and because they interact with federal rights, the reliable move is to check your state insurance department's Medigap page and your SHIP counselor before you assume you can or cannot switch.
Switching From Medicare Advantage Back to Original Medicare
This is the scenario where underwriting bites hardest. If you have been on Medicare Advantage past your first 12 months, federal rules generally do not guarantee you a Medigap policy when you return to Original Medicare. You may face underwriting, and a carrier can decline you. AARP's Medigap guidance identifies this as a real barrier to the move. Plan the sequence before you disenroll: confirm a Medigap policy is available to you, then coordinate the Part D enrollment, then make the Medicare Advantage change so you do not create a coverage gap.
Medicare Supplement vs. Medicare Advantage: Two Different Trade-Offs
Medicare Advantage bundles hospital, medical, and often drug coverage into one plan with networks and prior authorization. Medigap pairs with Original Medicare and adds provider freedom at a higher monthly cost. Neither is universally better. Both paths are growing because they serve different priorities. Browse our full Medicare solutions to see both side by side.
State Rules, Underwriting, and Buying Outside Open Enrollment
Here is where most guides stop short: plan availability and pricing rules vary by state, and outside your open enrollment window, insurers can review your health before issuing a policy. A carrier may decline you for a controlled condition, or approve you at a higher rate. If you are switching from Medicare Advantage back to Original Medicare, note that AARP's Medigap guidance identifies Medigap underwriting as a real barrier to that move.
Choosing a Plan by Health Needs, Travel Habits, and Budget
Start with three questions. How often do you see specialists? Do you travel or spend part of the year in another state? What monthly premium fits your budget without strain? Frequent specialists and travelers usually favor Plan G. Budget-focused seniors in good health may prefer Plan N or high-deductible G. Watch our Medicare videos for a walkthrough before you commit.
Schedule a No-Cost Plan Comparison With Carla Mills
The real risk is not picking the wrong letter. It is missing your enrollment window and paying a late penalty for years afterward.
We are an independent agency, which means we compare carriers side by side rather than pushing one company's product. Our no-cost, no-obligation consultations include a personalized benefit comparison and guidance on avoiding late enrollment penalties. Get started with Richland Group dba EnrollwithCarla.com and choose your coverage with clear numbers in front of you.
Frequently Asked Questions
Can you buy a Medicare Supplement plan at any time?
You can apply year-round, but the easiest window is your six-month Medigap Open Enrollment Period, which starts the month you are 65 or older and enrolled in Medicare Part B. During that window, insurers cannot use medical underwriting to deny you or charge more because of health history. Outside it, most states let carriers ask health questions and decline applicants, so timing matters more than most people expect.
Does Medigap Plan G cover prescription drugs?
No. Every Medigap plan, including Plan G, leaves prescription drug coverage out. You need a separate Medicare Part D plan for medications, and you can pair it with any Medigap policy from any carrier. Skipping Part D when you first become eligible can trigger a late enrollment penalty that stays on your premium for as long as you keep drug coverage, so line up Part D at the same time you choose your Medigap plan.
How much do Medicare Supplement plans cost?
Medicare Supplement plan costs vary by carrier, plan letter, age, tobacco use, ZIP code, and household discount eligibility, so there is no single figure. Compare quotes from several carriers for the same letter before deciding, because benefits are identical but premiums are not.
What is the difference between Medicare Supplement Plan G and Plan N?
Both cover the Part A deductible, Part B coinsurance, and hospital costs beyond Part A limits. Plan G pays 100% of Part B coinsurance; Plan N pays 100% of that coinsurance except for a copayment of up to $20 for some office visits and up to $50 for emergency room visits that do not lead to admission. Plan N usually carries a lower premium, so the trade-off is predictable copays against monthly savings.
Can you have a Medicare Supplement plan and Medicare Advantage at the same time?
No. Medigap works only alongside Original Medicare, and it cannot pay benefits while you are enrolled in Medicare Advantage. If you join Medicare Advantage, you can keep paying Medigap premiums for a policy that pays nothing, which is why most people drop the supplement when they switch. AARP also notes that Medigap can make it harder to return to Original Medicare later, since medical underwriting may apply.
What does Medicare Supplement insurance cover that Original Medicare does not?
Original Medicare pays its share of Part A hospital costs and Part B medical costs but leaves you responsible for deductibles, coinsurance, and copayments. Medigap policies are standardized to fill those gaps, and some letters add foreign travel emergency coverage and Part B excess charges. Medicare Part D, dental, vision, and hearing are not part of Medigap and require separate coverage or a different plan type.
