Medicare Advantage vs. Medicare Supplement: Which Is Right for You?

Medicare Supplement (Medigap) plans and Medicare Advantage (Part C) plans are the two primary ways to extend your Medicare coverage beyond what Original Medicare provides on its own. They are not interchangeable, and they cannot be used together. A Medigap plan works alongside Original Medicare and pays the deductibles, coinsurance, and copayments that Parts A and B leave behind. A Medicare Advantage plan replaces Original Medicare entirely, bundling your hospital and medical coverage into a single private plan that may also include prescription drugs, dental, vision, and hearing benefits.

The Core Difference: Supplement vs. Replacement

The fundamental distinction between these two plan types is structural. A Medicare Supplement plan is secondary insurance that pairs with Original Medicare. You keep your Parts A and B coverage, see any doctor or hospital in the country that accepts Medicare, and your Medigap policy picks up the remaining costs. A Medicare Advantage plan, by contrast, takes over from Original Medicare. The private insurer receives a fixed payment from Medicare to manage all your Part A and Part B benefits, and you receive care through the plan's provider network under its cost-sharing rules.

This structural difference drives every downstream distinction between the two plan types, including provider access, cost predictability, geographic flexibility, and the availability of extra benefits. Understanding this single concept makes the rest of the comparison straightforward.

Medicare Advantage vs. Medicare Supplement: Pros and Cons

Medicare Advantage Pros

Medicare Advantage plans frequently charge $0 monthly premiums beyond the standard Part B premium, making them attractive to beneficiaries on a fixed income. Most plans bundle prescription drug coverage (Part D) into the plan, eliminating the need for a separate drug plan. Many plans also include routine dental, vision, and hearing benefits, fitness memberships, over-the-counter allowances, and meal delivery after hospital stays. The Centers for Medicare & Medicaid Services (CMS) reports that over 54% of Medicare beneficiaries are now enrolled in Medicare Advantage, driven largely by these added benefits and low premiums.

Medicare Advantage Cons

The trade-off for lower premiums is higher and less predictable cost-sharing when you actually use care. In 2026, the in-network maximum out-of-pocket (MOOP) limit for Medicare Advantage plans can reach $9,350, and the combined in-network and out-of-network limit can reach $14,000. You will pay copayments for doctor visits, coinsurance for procedures, and daily copays for hospital stays that can range from $200 to $400 or more per day. Most plans require you to use an in-network provider for non-emergency care, and HMO plans typically require a referral from your primary care physician before seeing a specialist. Coverage is also limited to the plan's service area, which can be a problem if you travel frequently or split time between states.

Medicare Supplement (Medigap) Pros

Medicare Supplement plans offer the most predictable cost structure available in Medicare. With Plan G, the most popular Medigap plan in 2026, your only out-of-pocket cost for Medicare-covered services is the annual Part B deductible of $283. After that, Plan G covers 100% of Medicare-approved costs for the remainder of the year, including the Part A deductible ($1,736 per benefit period in 2026), hospital coinsurance, skilled nursing facility coinsurance, and the 20% Part B coinsurance. You can see any doctor or hospital anywhere in the United States that accepts Original Medicare with no network restrictions, no referrals, and no prior authorization requirements. Plans C, D, F, G, M, and N also include coverage for foreign travel emergencies.

Medicare Supplement (Medigap) Cons

Medigap plans carry higher monthly premiums than Medicare Advantage, typically ranging from $80 to $300 or more depending on your age, location, gender, and the carrier's rating method. You must purchase a separate Medicare Part D plan for prescription drug coverage, and Medigap does not include dental, vision, or hearing benefits, so those require additional standalone policies. There are 12 standardized plan letters to choose from, which can feel overwhelming without guidance. Most importantly, if you do not enroll during your one-time Medigap Open Enrollment Period, carriers in most states can use medical underwriting to evaluate future applications, potentially charging more or denying coverage based on pre-existing conditions.

Side-by-Side Comparison

Real-World Cost Comparison: A Year With Significant Medical Needs

Abstract comparisons only go so far. Consider a realistic scenario: a 70-year-old Medicare beneficiary who has a 5-day hospital stay, four specialist visits, one outpatient surgical procedure, and routine primary care visits during a single calendar year. Under Medicare Advantage (using a typical HMO plan in 2026), this beneficiary might pay a $350 per-day hospital copay for 5 days ($1,750), $40 per specialist visit ($160), 20% coinsurance on a $5,000 outpatient procedure ($1,000), plus various primary care copays totaling approximately $120. The total out-of-pocket cost for the year would be roughly $3,030, on top of the $0 plan premium.

Under Medicare Supplement Plan G with a monthly premium of $150, the same beneficiary would pay the $283 Part B deductible and nothing else for all Medicare-covered services. The total annual cost would be $1,800 in premiums plus $283, totaling $2,083. In this scenario, the Medigap enrollee pays approximately $950 less than the Medicare Advantage enrollee despite the higher monthly premium. In a healthy year with minimal care, the Medicare Advantage enrollee would pay less because they avoid the $1,800 in annual Medigap premiums. The crossover point, where Medigap becomes cheaper, typically occurs once annual medical expenses generate more than about $1,500 to $2,000 in Medicare Advantage copays and coinsurance.

Cost Comparison Table: Medicare Advantage vs. Plan G in 2026

Source: 2026 Medicare costs are set by the Centers for Medicare & Medicaid Services (CMS). The Part B premium is $202.90 per month, the Part B deductible is $283, and the Part A inpatient deductible is $1,736 per benefit period. Both Medicare Advantage and Medigap enrollees pay the Part B premium.

How to Choose Between Medicare Advantage and Medicare Supplement

Evaluate Your Cost Tolerance

If you want to know exactly what your healthcare will cost each month and each year, a Medicare Supplement plan provides that certainty. With Plan G, your maximum annual exposure is the $283 Part B deductible plus your monthly premium. If you are comfortable with variable costs and prefer to pay less in months when you do not use care, Medicare Advantage spreads costs across copayments and coinsurance that fluctuate with your utilization.

Consider Your Provider Preferences

Medicare Supplement plans allow you to see any doctor, specialist, or hospital in the United States that accepts Original Medicare, with no network restrictions and no referral requirements. Medicare Advantage plans typically require you to use in-network providers for non-emergency care. If you have established relationships with specific specialists, or if you live in a rural area with limited provider networks, Medigap offers significantly more flexibility.

Factor in Travel and Lifestyle

Medicare Supplement plans provide coverage anywhere in the U.S. and include foreign travel emergency coverage on most plan letters. Medicare Advantage plans generally limit routine coverage to the plan's service area and only cover emergencies outside that area. If you travel frequently, split time between states, or spend winters in a different region, a Medigap plan eliminates geographic coverage concerns entirely.

Assess Your Need for Extra Benefits

Many Medicare Advantage plans include routine dental, vision, and hearing coverage, fitness memberships, and over-the-counter allowances at no additional premium. Medicare Supplement plans do not include these benefits, so you would need to purchase separate standalone dental, vision, and hearing policies. If bundled extra benefits are important to you and you are comfortable with the network and cost-sharing trade-offs, Medicare Advantage delivers more services under one plan.

Can You Switch Between Medicare Advantage and Medicare Supplement?

Switching from Medicare Advantage to Medigap

Switching from a Medicare Advantage plan to a Medicare Supplement plan is possible but comes with a significant caveat. Outside of your initial Medigap Open Enrollment Period, insurance carriers in most states can use medical underwriting to evaluate your application. This means a pre-existing health condition could result in a higher premium, a waiting period for coverage of that condition, or a denial of coverage entirely. A few states, including California, Connecticut, Maine, Massachusetts, Missouri, New York, and Oregon, offer additional guaranteed-issue rights that make switching easier.

Switching from Medigap to Medicare Advantage

Switching from a Medicare Supplement plan to a Medicare Advantage plan is straightforward. You can enroll in a Medicare Advantage plan during the Annual Enrollment Period (October 15 through December 7 each year) or, if you are within your first 12 months of Medicare Advantage enrollment, during the Medicare Advantage Open Enrollment Period (January 1 through March 31). Medicare Advantage plans cannot deny you based on health status. However, be aware that if you later want to switch back to Medigap, you may face underwriting at that point.

Enrollment Window Summary

Key Takeaways

• Medicare Supplement (Medigap) plans work alongside Original Medicare and pay the deductibles, coinsurance, and copayments that Parts A and B leave behind, while Medicare Advantage (Part C) plans replace Original Medicare entirely with a private plan that manages all your benefits.

• Medicare Supplement Plan G, the most popular Medigap plan in 2026, limits your annual out-of-pocket costs for Medicare-covered services to the $283 Part B deductible, while Medicare Advantage plans can expose you to up to $9,350 in in-network out-of-pocket costs per year.

• Medicare Supplement plans allow you to see any doctor or hospital in the United States that accepts Original Medicare with no network restrictions, no referrals, and no prior authorization, while Medicare Advantage plans require you to use in-network providers for non-emergency care.

• A beneficiary with a 5-day hospital stay and multiple specialist visits in 2026 would pay approximately $2,083 total with Plan G (premiums plus deductible) compared to approximately $3,030 or more with a typical Medicare Advantage HMO plan.

• Your Medigap Open Enrollment Period is a one-time, six-month window starting when you turn 65 and enroll in Part B, and it is the only time you are guaranteed the right to purchase any Medigap plan regardless of health status.

• Switching from Medicare Advantage to Medigap after your Open Enrollment Period requires medical underwriting in most states, meaning a pre-existing condition could result in denial or higher premiums.