What Is Medigap (Medicare Supplement)? Beginner Guide
Educational disclaimer: This article is for general U.S. consumer education only and is not insurance, tax, legal, or personalized financial advice. Medigap (Medicare Supplement) policies are sold by private insurers; benefits are standardized by letter in most states, but premiums, underwriting, and guaranteed-issue rights vary by state, age, health, and timing. Dollar figures labeled 2026 (including the Part B deductible of $283, high-deductible Plan F/G deductible of $2,950, and Plans K/L out-of-pocket limits) come from Medicare.gov Medigap pages fetched for this guide. Massachusetts, Minnesota, and Wisconsin standardize Medigap differently. Do not treat this as a recommendation to buy, switch, or drop any policy. Confirm with Medicare.gov, your state insurance department, plan documents, and a licensed professional before you act. FitCreeper does not sell Medigap or Medicare plans. Contact: fryntavo@gmail.com.
What Is Medigap (Medicare Supplement)? Beginner Guide
By Ahmad Dogar
FitCreeper Finance · Educational only — not personalized insurance, tax, legal, or financial advice
How this article was made: Drafted with AI assistance, then checked against primary Medicare.gov Medigap sources fetched for ops day 2026-10-01 (Asia/Karachi): Medicare.gov Medigap basics, compare-plan-benefits chart (including 2026 Plan K/L out-of-pocket limits, high-deductible F/G $2,950, Plan N copay notes, and Part B deductible $283), and Medigap find/how-to pages. Cross-checked with FitCreeper’s live Medicare Basics cluster and CMS 2026 Parts A & B cost anchors. Re-check Medicare.gov and your state rules before you buy or switch.
Searching what is Medigap usually means you already know Original Medicare leaves deductibles, coinsurance, and copayments on the table—and you want a plain map of Medicare Supplement Insurance before a sales call. {A:mgap_basics|Medicare.gov's Medigap basics page} defines Medigap as extra insurance from a private company that helps pay your share of out-of-pocket costs in Original Medicare.
You can only buy Medigap if you have Original Medicare—generally Part A and Part B. Medigap is not Medicare Advantage, not Part D, and not a government-issued policy. It is a private supplement that works alongside federal Part A/B benefits.
Pair this overview with FitCreeper's live {L:med_what|What Is Medicare} and {L:med_ab|Part A vs Part B} guides. Medigap fills cost-sharing gaps; it does not replace learning what Medicare covers.
What Medigap is (and is not)
In Original Medicare you generally pay deductibles and coinsurance for approved services. Medigap policies help with those amounts according to a standardized letter chart in most states. Medicare.gov lists Plans A–D, F, G, and K–N as the common lettered options.
What Medigap is not: it is not a Medicare Advantage (Part C) plan, not long-term custodial care insurance, and not automatic prescription drug coverage. If you need retail drugs with Original Medicare + Medigap, you typically add a separate Part D plan—see {L:med_d|Part D coverage}.
Medicare SELECT (where offered) is a Medigap variant that can steer you to network hospitals for full benefits, with a right described on Medicare.gov to change your mind within 12 months and switch to a standard Medigap policy.
Standardized letter plans
In most states, policies with the same letter offer the same basic benefits regardless of insurer. Price is the difference between two Plan G policies from different companies—not a secret extra hospital day. Use {A:mgap_compare|Medicare.gov's compare-plan-benefits chart} before you memorize marketing names.
Key 2026 chart anchors: Plans K and L show out-of-pocket limits of $8,000 and $4,000; high-deductible Plans F and G (some states) use a $2,950 deductible; Plan N pays Part B coinsurance except copays up to $20 for some office visits and up to $50 for certain ER visits without admission; neither Plan G nor Plan N covers the Part B deductible ($283 in 2026).
Massachusetts, Minnesota, and Wisconsin use different standardization. If you live in those states, do not force the national letter chart onto your shopping list without state-specific materials.
Who can buy Medigap
Generally you need Part A and Part B first. People with Medicare Advantage usually cannot also have Medigap for the same coverage period. Newly eligible beneficiaries on or after January 1, 2020 generally cannot buy Plan C or Plan F—Medicare.gov ties that to when you first became eligible.
The friendliest shopping window for many people is the one-time Medigap Open Enrollment Period: six months starting the first month you have Part B and are 65 or older. During that window, insurers generally cannot deny you or charge more because of pre-existing conditions. Details expand in our Open Enrollment guide in this cluster.
Everyday example (educational, not advice)
Imagine you enroll in Part A and Part B at 65, keep Original Medicare, and want help with the Part A deductible ($1,736 per benefit period in 2026) and Part B's typical 20% coinsurance after the $283 deductible. You compare Plan G and Plan N quotes during Medigap Open Enrollment, confirm neither covers the Part B deductible, and decide whether Plan N's office/ER copays are acceptable. This sketch is educational only—your doctors, travel habits, and state rules control the real choice.
Source hygiene
Primary pages: {A:mgap_basics|Medigap basics}, {A:mgap_compare|compare benefits}, {A:mgap_find|find a policy}. Cross-check Part A/B dollar anchors on {A:mcare_cost|Medicare.gov costs} / {A:cms_2026|CMS 2026 fact sheet}.
Reject screenshots of undated premium tables. Prefer year-labeled Medicare.gov charts and written insurer quotes for your ZIP and age.
Myths to drop
- Medigap is a government plan. Private insurers sell it; Medicare sets standardization rules in most states.
- Medigap includes my prescriptions. Usually no—add Part D separately with Original Medicare.
- I can keep Advantage and buy Medigap. Generally you need Original Medicare, not Advantage, to buy Medigap.
- Plan F is available to everyone new to Medicare. First eligibility on/after Jan 1, 2020 generally blocks Plan C/F.
- All Plan G prices are identical. Benefits match by letter; premiums differ by company and rating method.
Habit stack
- Bookmark {A:mgap_basics|Medicare.gov Medigap basics} and the compare chart.
- Confirm you have (or will have) Part A and Part B before requesting quotes.
- List doctors who accept Medicare assignment—relevant for Plan N excess-charge exposure.
- Write the start month of your Medigap Open Enrollment on a calendar.
- Save PDF quotes with insurer name, letter plan, rating method, and effective date.
Checklist
- I can define Medigap as private supplement insurance for Original Medicare cost-sharing.
- I know Medigap is not Medicare Advantage and not Part D.
- I can cite 2026 chart anchors: Part B deductible $283, HD F/G $2,950, Plan K/L OOP $8,000/$4,000.
- I will verify state standardization (especially MA/MN/WI) before comparing letters.
- I will not treat this article as a buy/sell recommendation.
How this fits other FitCreeper guides
Medigap sits beside {L:med_what|Medicare basics}, {L:med_adv|Advantage}, {L:med_d|Part D}, {L:ltc_what|LTC insurance}, and {L:budget|budgeting} on FitCreeper. Do not link unpublished Medigap drafts until they are live.
Additional practice notes for beginners
If you are under 65 with Medicare due to disability, Medigap access varies sharply by state—confirm locally rather than assuming the age-65 Open Enrollment story.
Medicare.gov's Medigap basics page is the consumer map for what Medigap is, what it is not, and the one-time Open Enrollment window. When a sales email and Medicare.gov disagree, trust Medicare.gov.
Year labels matter. The 2026 Part B deductible ($283) appears in Medigap compare charts for Plans K/L out-of-pocket wording and as a cost neither Plan G nor Plan N covers. Keep 2026 next to every dollar you share with family.
High-deductible Plans F and G (where offered) use a $2,950 deductible in 2026 before the policy pays—Medicare.gov compare chart. That is a different product design from standard Plan G.
Plans K and L have yearly out-of-pocket limits of $8,000 and $4,000 in 2026 (plus the Part B deductible framing on Medicare.gov). Most other letter plans do not use that same OOP-limit design.
You generally cannot buy a Medigap policy if you have Medicare Advantage. Medigap works with Original Medicare (Part A and Part B). Dropping Advantage to buy Medigap later can mean underwriting—educational framing only.
Massachusetts, Minnesota, and Wisconsin standardize Medigap differently from the letter chart used in most states. Always check your state before comparing Plan G vocabulary.
People first eligible for Medicare on or after January 1, 2020 generally cannot buy Plan C or Plan F. Medicare.gov flags that eligibility depends on when you first became eligible.
Medigap does not usually include prescription drug coverage. Pair Original Medicare + Medigap with a separate Part D plan if you need retail drugs—see FitCreeper's live {L:med_d|Medicare Part D} guide.
Medigap Open Enrollment is not the same as the annual Medicare Open Enrollment Period for health and drug plans. The Medigap window is generally a one-time 6-month period tied to Part B and age 65+.
After Medigap Open Enrollment, insurers in many states can use medical underwriting. Guaranteed-issue rights exist in specific situations—verify on Medicare.gov and with your state SHIP or insurance department.
Price is the main difference between policies with the same letter from different companies in standardized states. Benefits for Plan G at Company A should match Plan G at Company B—premiums will not.
Foreign travel emergency benefits on some letters (including G and N) are limited (often 80% up to plan limits) and are not a substitute for travel medical insurance for long trips.
Pair this cluster with FitCreeper's live {L:med_what|What Is Medicare} and {L:med_adv|Medicare Advantage} guides so you do not confuse supplement insurance with Part C private plans.
Long-term custodial care is still largely outside Medigap's job description. See FitCreeper's live {L:ltc_what|long-term care insurance} overview for that separate risk.
If you still have an HSA while approaching Medicare, read IRS Pub 969 eligibility alongside Medicare.gov. HSA contributions generally stop once Medicare enrollment begins—see {L:hsa_what|HSA beginner}.
Keep a folder with Medicare cards, Medigap policy, Part D Evidence of Coverage, and premium invoices. Beginners lose time hunting paperwork when comparing renewals.
Community-rated, issue-age-rated, and attained-age-rated premium methods change how your bill ages. Ask the insurer which method they use before comparing two Plan G quotes.
Household budgeting for Medigap belongs next to Part B premiums near the 2026 standard $202.90 (before IRMAA). Use FitCreeper's {L:budget|budget} guide for line-item habits—not as enrollment advice.
Do not invent average national Medigap premiums from memory in comments. Quotes are local, age-specific, and smoker or non-smoker specific.
State guaranteed-issue and birthday-rule protections vary. Some states offer more switching flexibility than others—never assume a neighbor's state rules apply to you.
Medicare SELECT policies (where available) can require network hospitals for full benefits, with a right to switch to a standard Medigap within 12 months per Medicare.gov basics language.
Watch for illegal sales practices Medicare.gov warns about: selling you a Medigap when you have Advantage, claiming Medigap is a government plan, or high-pressure today-only tactics.
Railroad Retirement Board and disability-before-65 paths can change when Medigap Open Enrollment starts. Confirm your start month on Medicare.gov rather than assuming age-65-only stories.
Educational only: FitCreeper does not sell Medigap, Medicare Advantage, or Part D policies.
When you cite costs online, link Medicare.gov's Medigap compare chart or CMS fact sheets and keep the year label (2026) next to each dollar figure.
If adult children help parents shop, use shared calendars for the 6-month Open Enrollment window and keep insurer quote PDFs in a secure folder—not in unsecured email threads.
Re-check Medicare.gov annually even if you keep the same letter plan—deductibles and high-deductible thresholds update, and your insurer's premium method still matters.
Umbrella, auto, and homeowners policies do not replace Medigap for Medicare cost-sharing. See {L:umb_what|umbrella} and {L:ho_what|homeowners} guides for liability and property risks.
This cluster is educational orientation. Purchase decisions belong to you, Medicare.gov tools, state departments, and licensed helpers—not a blog checklist.
The 2026 Part A inpatient deductible ($1,736 per benefit period) is often covered by Plan G and Plan N per the Medicare.gov chart—still verify your letter before assuming hospital math.
Keep SHIP counselor notes with your quote PDFs. State health insurance assistance programs are designed for unbiased Medicare shopping help.
If you move across state lines, re-check whether your Medigap policy travels and whether guaranteed-issue rights open new options—state law differs.
Related Guides
- What Is Medicare? Beginner Guide
- Medicare Part A vs Part B Explained
- Medicare Part D Prescription Drug Coverage
- What Is Long-Term Care Insurance?
Bottom Line
Medigap is private Medicare Supplement insurance that helps with Original Medicare cost-sharing using standardized letter plans in most states—verify on Medicare.gov before you buy.
FAQ
What is Medigap?
Medicare.gov: extra insurance from a private company that helps pay Original Medicare out-of-pocket costs like copayments, coinsurance, and deductibles.
Can I buy Medigap with Medicare Advantage?
Generally no—you need Original Medicare (Part A and Part B).
Are Medigap plans standardized?
In most states, yes—same letter means same basic benefits; MA/MN/WI differ.
Does Medigap include prescription drugs?
Usually not—add Part D separately with Original Medicare.
What is the Medigap Open Enrollment Period?
Generally a one-time 6-month window starting the first month you have Part B and are 65 or older.
Can new Medicare beneficiaries buy Plan F?
People first eligible on or after Jan 1, 2020 generally cannot buy Plan C or Plan F.
Is this insurance advice?
No—educational only.
Sources
- Medicare.gov — Get Medigap Basics
- Medicare.gov — Compare Medigap plan benefits
- Medicare.gov — Find a Medigap policy
