Medicare Advantage vs. Medicare Supplement: Which Is Right for You?
The choice between Medicare Advantage and Medicare Supplement is the most consequential Medicare decision most people make. Both approaches cover Medicare-eligible services, but they work very differently — and the right answer depends on your health, finances, travel habits, and priorities.
This guide explains how each approach works, compares costs and coverage, and helps you understand the trade-offs. It is written from the perspective of an independent Medicare broker who represents both Medicare Supplement and Medicare Advantage carriers.
How Original Medicare Works
Original Medicare consists of Part A (hospital insurance) and Part B (medical insurance). Part A covers inpatient hospital stays, skilled nursing facility care, hospice, and some home health services. Part B covers outpatient services, physician visits, preventive care, durable medical equipment, and most outpatient procedures.
Most people do not pay a premium for Part A if they or their spouse worked and paid Medicare taxes for at least 10 years. The standard Part B premium in 2026 is $202.90/month (2027 figure pending CMS publication in November 2026). Higher-income beneficiaries pay more through IRMAA surcharges.
Original Medicare does not have an annual out-of-pocket maximum. You are responsible for the Part A deductible per benefit period, the Part B deductible, and 20% coinsurance on most Part B services with no cap. A serious illness or extended hospital stay can generate substantial cost-sharing under Original Medicare alone.
This cost-sharing exposure is why most Medicare beneficiaries add either a Medicare Supplement plan or a Medicare Advantage plan to their Original Medicare coverage.
What Medicare Supplement Insurance Covers
Medicare Supplement insurance — also called Medigap — is private health insurance that works alongside Original Medicare. Medigap policies pay some or all of the cost-sharing that Original Medicare leaves to the beneficiary: deductibles, coinsurance, and copayments for Medicare-covered services.
Medigap benefits are standardized by the federal government. Plan G from one insurance company provides the same core Medicare Supplement benefits as Plan G from any other company. The primary variables are the monthly premium and the carrier's rate history.
Medigap policies generally do not have provider networks. For Medicare-covered services, you can see any provider that accepts Medicare — the provider bills Medicare first, and Medigap pays the applicable cost-sharing. The provider does not need to have a contract with your Medigap insurer.
What Medigap covers (Plan G example)
- Part A coinsurance and hospital costs up to an additional 365 days after Medicare benefits are exhausted
- Part B coinsurance or copayment (20% of Medicare-approved amounts)
- Part A hospice care coinsurance or copayment
- Part A deductible
- Skilled nursing facility care coinsurance
- Part B excess charges (when a provider charges above the Medicare-approved amount)
- Foreign travel emergency care (up to plan limits)
Medigap does not include prescription drug coverage
Medicare Supplement plans cover Medicare-eligible medical services only. If you enroll in a Medigap plan, you should also enroll in a standalone Medicare Part D prescription drug plan. Delaying Part D enrollment without creditable drug coverage can result in a permanent late enrollment penalty.
How Medicare Advantage Plans Work
Medicare Advantage (Part C) is an alternative way to receive your Medicare benefits through a private insurance company approved by Medicare. When you enroll in a Medicare Advantage plan, the plan covers your Part A and Part B benefits instead of Original Medicare. Most Medicare Advantage plans also include Part D prescription drug coverage.
Medicare Advantage plans must cover at least the same services as Original Medicare Parts A and B, but they typically use provider networks and may require referrals or prior authorization for certain services. Plan benefits, premiums, cost sharing, and provider networks vary by plan and service area and change each plan year.
Many Medicare Advantage plans offer additional benefits not covered by Original Medicare, such as routine dental, vision, hearing, and fitness programs. These supplemental benefits vary significantly by plan and are not guaranteed to continue from year to year.
HMO
Health Maintenance Organization. Typically requires a primary care physician and referrals to see specialists. Generally does not cover out-of-network care except in emergencies.
PPO
Preferred Provider Organization. More flexibility to see out-of-network providers, typically at higher cost sharing. Referrals generally not required.
PFFS / SNP
Private Fee-for-Service and Special Needs Plans. PFFS plans set their own payment terms. SNPs serve specific populations such as people with certain chronic conditions or dual Medicare-Medicaid eligibility.
Medicare Advantage vs. Medicare Supplement: Side-by-Side Comparison
The table below compares the two approaches across the factors that matter most to most beneficiaries. Individual plan details vary — this is a general framework, not a description of any specific plan.
| Factor | Medicare Supplement (Medigap) | Medicare Advantage |
|---|---|---|
| Monthly premium | Higher monthly premium (varies by plan, carrier, age, and location). Plan G premiums for a 65-year-old non-smoker typically range from roughly $100–$250+/month depending on state and carrier. | Many plans have $0 or low monthly premiums beyond the Part B premium. Some plans have higher premiums for richer benefit packages. |
| Provider access | Any provider that accepts Medicare, anywhere in the United States. No network restrictions for Medicare-covered services. | Typically limited to a plan network. HMO plans generally require in-network care except in emergencies. PPO plans allow out-of-network access at higher cost sharing. |
| Annual out-of-pocket maximum | Plan G and Plan N cover most Medicare cost-sharing, providing predictable out-of-pocket exposure for Medicare-covered services. No CMS-mandated MOOP cap applies to Medigap. | CMS requires all Medicare Advantage plans to include an annual out-of-pocket maximum for in-network covered Part A and Part B services. The cap varies by plan. |
| Prescription drug coverage | Not included. A separate Part D plan is required. | Most plans include integrated Part D drug coverage (MAPD). Standalone Part D plans are not compatible with most MAPD plans. |
| Prior authorization | Original Medicare does not require prior authorization for most services. Medigap follows Original Medicare rules. | Plans may require prior authorization for many services including specialist visits, imaging, procedures, and hospital admissions. Requirements vary by plan. |
| Referrals | Not required. You can see any Medicare-participating specialist directly. | HMO plans typically require a referral from a primary care physician to see a specialist. PPO plans generally do not require referrals. |
| Travel and snowbirds | Strong nationwide coverage. Any Medicare-participating provider in any state. Some plans include limited foreign travel emergency coverage. | Coverage outside the service area is typically limited to emergency and urgently needed care. Extended travel or spending time in another state may create coverage gaps. |
| Supplemental benefits | No supplemental benefits. Covers Medicare cost-sharing only. | Many plans include dental, vision, hearing, fitness, and other supplemental benefits. Benefits vary by plan and may change annually. |
| Enrollment flexibility | Best enrolled during your 6-month Medigap Open Enrollment Period. Outside this window, most states allow medical underwriting. Some states have additional protections. | Can enroll or switch during Annual Enrollment Period (Oct 15–Dec 7) or Medicare Advantage Open Enrollment Period (Jan 1–Mar 31). No medical underwriting. |
| Long-term cost predictability | Premiums increase over time but cost-sharing for Medicare-covered services is predictable. No surprise bills for covered services. | Lower initial premiums but cost sharing (copays, coinsurance, deductibles) can accumulate with heavy use. Benefits and networks can change annually. |
| Switching back to Medigap later | Once enrolled during your Medigap OEP, your coverage is guaranteed renewable. You can switch carriers with underwriting (or without, in states with birthday/anniversary rules). | Switching from MA to Medigap outside of guaranteed-issue rights requires passing medical underwriting in most states. Health conditions developed while on MA may affect eligibility. |
| Cost predictability | Premiums are fixed and known in advance. Out-of-pocket exposure for Medicare-covered services is highly predictable with Plan G. No surprise bills for covered services. | Premiums may be low or $0, but cost-sharing (copays, coinsurance, MOOP) varies by plan and service. Total annual costs depend on how much care you use. |
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Plan G vs. Medicare Advantage
Plan G is the most comprehensive Medicare Supplement plan available to people newly eligible for Medicare. After you pay the Part B deductible, Plan G covers essentially all remaining Medicare-approved cost-sharing: Part A and Part B coinsurance, the Part A deductible, skilled nursing facility coinsurance, and Part B excess charges. (Part B deductible: $283 in 2026; 2027 figure pending)
With Plan G, your primary out-of-pocket exposure for Medicare-covered services is the annual Part B deductible. Beyond that, you pay nothing for Medicare-approved services from any Medicare-participating provider in the country.
Medicare Advantage plans typically have lower monthly premiums than Plan G, but they introduce cost-sharing at the point of service — copayments for office visits, coinsurance for hospital stays, and cost-sharing for specialist care. For beneficiaries who use healthcare frequently, the cumulative cost-sharing under a Medicare Advantage plan can exceed the premium savings compared to Plan G.
For beneficiaries who prioritize predictable costs, nationwide provider access, and freedom from prior authorization requirements, Plan G is often the plan of choice. For beneficiaries who are generally healthy, have limited budgets, and value supplemental benefits such as dental and vision, Medicare Advantage may be a reasonable fit.
Plan N vs. Medicare Advantage
Plan N is the second most commonly selected Medicare Supplement plan for newly eligible beneficiaries. Plan N covers the same core benefits as Plan G with two differences: it requires a copayment of up to $20 for some office visits and up to $50 for emergency room visits that do not result in an inpatient admission, and it does not cover Part B excess charges.
In exchange for accepting these cost-sharing elements, Plan N typically carries a lower monthly premium than Plan G. For beneficiaries who visit the doctor infrequently and want to reduce their monthly premium while retaining nationwide provider access and predictable major-illness coverage, Plan N can be an effective middle ground.
Compared to Medicare Advantage, Plan N still provides the same fundamental advantages of Medigap: no provider network, no referral requirements, and no prior authorization for Medicare-covered services. The trade-off is a higher monthly premium than most Medicare Advantage plans.
High-Deductible Plan G vs. Medicare Advantage
High-Deductible Plan G (HDG) is a Medicare Supplement plan with the same benefits as standard Plan G, but with a high annual deductible before those benefits begin. Once you meet the deductible, HDG covers the same Medicare cost-sharing as standard Plan G. The 2027 HDG deductible is $3,050.
Because of the high deductible, HDG premiums are substantially lower than standard Plan G — often comparable to or lower than many Medicare Advantage plan premiums. HDG retains the core Medigap advantages: any Medicare-participating provider, no network, no referrals, no prior authorization.
HDG is generally most suitable for beneficiaries who are in good health, have the financial reserves to absorb the deductible in a high-utilization year, and want to minimize monthly premiums while preserving nationwide provider access and catastrophic coverage.
Prescription Drug Coverage Differences
This is one of the most important structural differences between the two approaches.
Medicare Supplement + Part D
Medigap plans do not include prescription drug coverage. You must enroll in a separate standalone Part D plan. This gives you the flexibility to choose a Part D plan based on your specific medications and preferred pharmacy, independent of your medical coverage.
The 2027 maximum Part D deductible is $700. The 2027 Part D out-of-pocket cap is $2,400 — after reaching this threshold, you pay $0 for covered Part D drugs for the rest of the year.
Medicare Advantage with Part D (MAPD)
Most Medicare Advantage plans include integrated Part D drug coverage. This simplifies administration — one plan, one card. However, your drug formulary, pharmacy network, and drug cost-sharing are tied to your medical plan.
If your Medicare Advantage plan's formulary does not cover your medications favorably, you cannot switch to a different Part D plan without also changing your medical coverage. The same $2,400 cap applies to MAPD plans.
Travel and Snowbird Considerations
Geographic flexibility is one of the most significant practical differences between Medicare Supplement and Medicare Advantage.
Medicare Supplement plans work with Original Medicare. Because Original Medicare is a federal program, any provider that accepts Medicare — anywhere in the United States — will accept your Medigap coverage. If you spend winters in Florida and summers in Michigan, or if you travel frequently, Medigap provides consistent coverage regardless of where you are.
Medicare Advantage plans are geographically defined. Your plan has a service area, and coverage outside that area is typically limited to emergency and urgently needed care. If you spend extended time in another state, you may find that your regular providers are out of network and that routine care is not covered.
Some Medicare Advantage PPO plans offer broader out-of-network coverage, and some national PPO plans have larger service areas. If you are considering Medicare Advantage and travel frequently, verify the plan's out-of-area coverage terms carefully before enrolling.
Making This Decision When You Turn 65
Your Medigap Open Enrollment Period begins the month you are both age 65 or older and enrolled in Medicare Part B. This six-month window is the most important enrollment opportunity for Medicare Supplement coverage. During this period, Medigap insurers cannot use medical underwriting to deny coverage or charge higher premiums based on your health status.
Once your Medigap Open Enrollment Period ends, most states allow insurers to use medical underwriting when you apply for a new Medigap policy. If you have significant health conditions, you may be declined or charged higher premiums. This is why the decision between Medicare Advantage and Medicare Supplement is best made before or during your initial enrollment window — not after a health event.
Medicare Advantage plans do not use medical underwriting. You can enroll in or switch Medicare Advantage plans during the Annual Enrollment Period (October 15 – December 7) regardless of health status. However, if you later want to switch from Medicare Advantage to a Medigap plan, you may face underwriting in most states.
Switching from Medicare Advantage to a Medicare Supplement Plan
Switching from Medicare Advantage to a Medicare Supplement plan is possible, but it requires careful timing. Outside of guaranteed-issue rights, most states allow Medigap insurers to use medical underwriting when you apply after your initial enrollment window. This means that if you develop health conditions while on Medicare Advantage, you may have difficulty qualifying for Medigap coverage later.
This asymmetry is one of the most important practical differences between the two approaches. Enrolling in Medicare Advantage at 65 is easy — most people can join any plan available in their area during their Initial Enrollment Period. Moving back to Original Medicare and Medigap later is not always possible. If your health has changed, you may be declined for Medigap coverage or offered coverage only at a higher rate, depending on your state's rules.
Guaranteed-issue rights protect you in specific situations. If your Medicare Advantage plan is discontinued, leaves your service area, or you move out of the plan's service area, you may qualify for a guaranteed-issue right to enroll in certain Medigap plans without underwriting. The specific plans available under guaranteed-issue rights are defined by federal law. A plan nonrenewal is not the same as a voluntary disenrollment — the trigger matters.
Some states have additional consumer protections. A few states have annual open enrollment periods or birthday rules that allow Medigap plan changes without underwriting under certain conditions. Florida does not have a birthday rule. If you are considering Medicare Advantage and may want the option to switch to Medigap later, understanding your state's rules before you enroll is important.
The practical implication: if you are in good health at 65 and want to preserve the option to move to Medigap later, enrolling in Medigap during your Open Enrollment Period locks in that coverage without underwriting. Waiting to see how Medicare Advantage works out is a reasonable choice — but it carries the risk that your health may change before you decide to switch.
Veterans, TRICARE, and Federal Retirees
Beneficiaries with other coverage sources face additional considerations when choosing between Medicare Advantage and Medicare Supplement.
Veterans with VA Benefits
Veterans who use VA healthcare for their primary care may find that Medicare Supplement provides a useful complement for non-VA care. VA benefits and Medicare are separate systems — VA coverage does not count toward Medicare cost-sharing, and Medicare does not pay for care at VA facilities. Some veterans choose Medigap to cover Medicare cost-sharing when they use non-VA providers, while others rely primarily on VA care and choose Medicare Advantage for its lower premiums.
TRICARE for Life
Military retirees with TRICARE for Life (TFL) have comprehensive coverage that wraps around Medicare. TFL pays most Medicare cost-sharing, which means a separate Medigap plan is generally not necessary. Enrolling in Medicare Advantage may affect how TFL coordinates benefits. Military retirees should review their specific TRICARE for Life terms before making Medicare enrollment decisions.
Federal Retirees (FEHB)
Federal retirees covered by the Federal Employees Health Benefits (FEHB) program have employer-sponsored coverage that coordinates with Medicare. FEHB plans generally provide good coverage alongside Medicare, and many federal retirees do not need a separate Medigap plan. Federal retirees should evaluate whether their FEHB plan's Medicare coordination meets their needs before purchasing additional coverage.
Why Many Beneficiaries Choose Medicare Supplement
As an independent Medicare broker, I represent both Medicare Supplement and Medicare Advantage carriers. My role is to help you understand your options and find coverage that fits your situation — not to steer you toward one approach.
That said, many of the clients I work with ultimately choose Medicare Supplement for reasons that are worth understanding clearly.
Predictable costs for Medicare-covered services
With Plan G, your primary out-of-pocket exposure is the Part B deductible. There are no surprise bills for Medicare-approved services. For people managing chronic conditions or planning for retirement on a fixed income, this predictability has real value.
Freedom to choose any Medicare-participating provider
Medigap has no network. You can see any physician, specialist, or hospital that accepts Medicare — in any state — without referrals or prior authorization. For people who have established relationships with specific physicians or who want access to major academic medical centers, this matters.
Reduced dependence on annual plan changes
Medicare Advantage plans can change their benefits, formularies, premiums, and provider networks each year. Medigap benefits are standardized by the federal government and do not change. Your coverage is stable from year to year.
Travel and geographic flexibility
For snowbirds, frequent travelers, or people who split time between states, Medigap provides consistent coverage nationwide. Medicare Advantage plans are geographically defined and may not cover routine care outside the service area.
Medicare Advantage is not the wrong choice for everyone
Medicare Advantage plans can be a reasonable fit for beneficiaries who are generally healthy, have limited budgets, value supplemental benefits, and are comfortable with a provider network. The right choice depends on your individual health, finances, and priorities — not a universal rule.
Frequently Asked Questions
Can I have both Medicare Advantage and Medicare Supplement at the same time?
No. Medicare Supplement plans are designed to work with Original Medicare, not Medicare Advantage. If you are enrolled in Medicare Advantage, a Medigap insurer cannot legally sell you a Medigap policy. You must be enrolled in Original Medicare (Parts A and B) to use a Medicare Supplement plan.
What happens if my Medicare Advantage plan is discontinued?
If your Medicare Advantage plan is discontinued or leaves your service area, you have a guaranteed-issue right to enroll in certain Medicare Supplement plans without medical underwriting. This is one of the most important guaranteed-issue rights available to Medicare Advantage enrollees. You also have the right to return to Original Medicare.
Do Medicare Supplement premiums increase over time?
Yes. Medigap premiums generally increase over time due to medical inflation and, depending on how the policy is rated, due to age. Carriers use different rating methods: community-rated (same premium for all ages), issue-age-rated (based on age when you first enroll), and attained-age-rated (increases as you age). Understanding how a carrier rates its policies is an important part of evaluating long-term costs.
Does Medicare Advantage require prior authorization?
Many Medicare Advantage plans require prior authorization for a range of services including specialist visits, imaging studies, procedures, and hospital admissions. Prior authorization requirements vary by plan and can change annually. Original Medicare does not require prior authorization for most services, and Medigap follows Original Medicare rules.
What is the Medicare Advantage Open Enrollment Period?
The Medicare Advantage Open Enrollment Period runs January 1 through March 31 each year. During this period, people already enrolled in a Medicare Advantage plan can switch to a different Medicare Advantage plan or return to Original Medicare (and enroll in a standalone Part D plan). This period does not provide a guaranteed-issue right to enroll in a Medigap plan in most states.
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Medicare benefit information is based on CMS Medicare & You 2026 and the CMS 2027 Medicare Advantage and Part D Landscape release (September 2026). The 2027 Part B premium and deductible figures are pending CMS publication (expected November 2026); 2026 figures are retained until official 2027 figures are published. Medicare Advantage plan benefits, premiums, networks, and cost sharing vary by plan and service area and change annually. This page is for educational purposes only and does not constitute enrollment advice for any specific plan. William Gray is a licensed independent insurance broker. License information available on the About page. Part A deductible: $1,736 (2026). Part B deductible: $283 (2026). Last reviewed: 2026-10-30.