Medicare Advantage vs. Medigap: How to Choose the Right Path

One of the most important decisions you'll make about Medicare is choosing between Medicare Advantage and Medigap. Both are valid paths to coverage, but they work in fundamentally different ways. Understanding the differences can help you make the choice that's right for your health and financial situation.

This guide breaks down how each option works, what they cost, and how to think about which one might be the better fit for you.

What is Medicare Advantage (Part C)?

Medicare Advantage is a bundled approach to coverage. Instead of traditional Medicare Parts A and B, you get your hospital and medical coverage through a private insurance company that's approved by Medicare. Most Medicare Advantage plans also include Part D (prescription drug coverage) and may offer extras like dental, vision, hearing, or fitness benefits.

How It Works

• Private insurance company administers your coverage
• You typically have a limited provider network (like an HMO or PPO)
• You usually must use in-network doctors, or pay more
• You get an annual out-of-pocket maximum for protection
• Plans may offer extra benefits not covered by Original Medicare
• Prescription drug coverage is often included

Medicare Advantage plans are sometimes called "Part C" plans because they're the third part of the Medicare framework (after Parts A and B).

What is Medigap (Medicare Supplement)?

Medigap takes a gap-filling approach. You keep traditional Medicare Parts A and B (government-run), and then you add a Medigap policy from a private insurance company to help pay for the costs that Original Medicare doesn't cover—things like deductibles, copays, and coinsurance.

How It Works

• You enroll in Original Medicare (Parts A and B) first
• You add a Medigap plan on top to cover out-of-pocket costs
• You can see any doctor who accepts Medicare
• There are no networks to worry about
• You purchase Part D separately for prescription drugs
• Medigap plans are standardized (same coverage regardless of insurer)

Medigap is also called "Medicare Supplement" because it supplements (fills gaps in) Original Medicare coverage.

Side-by-Side Comparison

Cost Structure Differences

Medicare Advantage Costs

Medicare Advantage plans typically have lower or no monthly premiums, but you may pay more when you use healthcare services:

Medigap Costs

Medigap plans typically have higher monthly premiums, but more predictable out-of-pocket costs:

Provider Networks

Medicare Advantage Networks

Medicare Advantage plans work like traditional health insurance with networks:

• In-network doctors: You pay standard copays and coinsurance.
• Out-of-network doctors: You pay higher amounts or may not be covered at all (except in emergencies).
• Restrictions: Many MA plans require you to use a specific hospital or get a referral for specialists.
• Annual changes: Networks change each year, so your preferred doctor might be in-network one year and out-of-network the next.

Medigap Freedom

With Medigap, there are no networks:

• Any doctor: You can see any doctor who accepts Medicare, anywhere in the country.
• No referrals: You don't need permission to see a specialist.
• No restrictions: You can choose your own hospital.
• Travel friendly: Medigap coverage follows you nationwide, which is valuable if you travel or split time between states.

When Medicare Advantage Might Be a Better Fit

Medicare Advantage may be right for you if:

• You want low monthly premiums: Many MA plans have $0 premiums.
• You're generally healthy: If you rarely see doctors, the lower upfront costs may save you money overall.
• You value extra benefits: Dental, vision, hearing, and fitness benefits are appealing.
• You're comfortable with networks: You don't mind using in-network doctors.
• You like clear annual limits: The out-of-pocket maximum provides certainty about worst-case costs.
• You live in a stable area: You're likely to stay in the same geographic location where your MA plan has a strong network.

When Medigap Might Be a Better Fit

Medigap may be right for you if:

• You have chronic conditions: If you see doctors frequently, you may prefer the predictable Medigap costs.
• You want provider flexibility: You prefer to see any doctor without network restrictions.
• You travel frequently: Medigap coverage is accepted nationwide; MA networks may not be.
• You have specific doctors: Your preferred doctors might not be in the local MA networks.
• You value consistency: Medigap plans are standardized and don't change year-to-year.
• You're willing to pay more: Higher premiums for lower copays and coinsurance may be worth it to you.

Can You Switch Between Them?

Yes, you can switch between Medicare Advantage and Medigap, but there are important considerations:

Switching From Medicare Advantage to Medigap

You can switch during the Annual Enrollment Period (October 15 - December 7). However, if you were originally enrolled in Medicare Advantage and later switch to Original Medicare, you may face medical underwriting when you try to buy a Medigap policy. This means the insurance company can review your health history, deny you coverage, or charge you more. The only exception is if you switch during a Special Enrollment Period (which is limited).

Switching From Medigap to Medicare Advantage

Switching from Medigap to Medicare Advantage is generally easier. You can switch during AEP or MA OEP (January 1 - March 31). The insurance company cannot deny you coverage for a Medicare Advantage plan based on health.

Questions to Ask Yourself

Key Takeaways

• Medicare Advantage bundles coverage with a private insurer, often with low premiums but network restrictions.
• Medigap supplements Original Medicare with freedom to see any doctor, but higher monthly costs.
• You must choose one or the other—you cannot have both simultaneously.
• Switching is possible but may involve medical underwriting if you go from MA to Medigap.
• Your choice may affect your flexibility in future years, so choose based on your current and anticipated healthcare needs.
• Learn more about enrollment timing in our guide to Medicare Enrollment Periods.

The right plan for you depends on your health, your doctors, your budget, and your lifestyle. An independent advisor who can compare plans across multiple carriers may help you understand your options so you can make an informed decision.