Medicare Advantage vs. Medigap: What’s the Difference?

Choosing between Medicare Advantage and Original Medicare with Medigap is an important Medicare coverage decision.

Both options are designed to help manage your healthcare costs. But they work very differently.

Understanding the structure of each can help you choose coverage that fits your budget, risk tolerance, and lifestyle.

Let’s walk through it clearly.

If you’re still in your initial enrollment window, start with the step-by-step Medicare enrollment checklist before making this decision.

What Is Medicare Advantage?

Medicare Advantage (also called Part C) is another way to receive your Medicare Part A and Part B benefits through a Medicare-approved private plan.

These plans:

• You remain enrolled in Medicare, while the Medicare Advantage plan generally becomes the main way you receive most Medicare-covered healthcare
• Often include prescription drug coverage (Part D)
• May include benefits beyond Original Medicare; benefits vary by plan and location
• May use provider networks and plan-specific rules; details vary by plan type

Depending on the specific Medicare Advantage plan, costs may include:

• A plan premium, which varies by plan and is paid in addition to the Part B premium
• Copays and cost-sharing when you receive care
• An annual out-of-pocket maximum

Medicare Advantage plans set a yearly limit on what you pay for covered Part A and Part B services. The limit and the costs that count toward it vary by plan.

Some plans offer benefits beyond Original Medicare, but availability, coverage rules, and costs vary by plan and location.

What Is Medigap (Medicare Supplement)?

Medigap works differently.

Medigap works with Original Medicare and helps pay some of the out-of-pocket costs Original Medicare leaves you responsible for.

With this structure:

• You keep Original Medicare (Part A and Part B)
• If you want Medicare drug coverage and do not already have other creditable prescription drug coverage, you may choose a separate Medicare drug plan (Part D)
• You purchase a Medicare Supplement policy from a private insurer

Medigap plans help cover some of the out-of-pocket costs that Original Medicare does not fully pay — such as deductibles and coinsurance.

Unlike Medicare Advantage:

• You pay a separate Medigap premium; the amount varies by policy, company, location, rating method, eligibility, and other factors
• Your share of Original Medicare costs depends on the Medigap policy you choose
• Most standard Medigap policies do not use provider networks in the way Medicare Advantage plans may. Medicare SELECT policies are an exception and may require certain hospitals—and, in some cases, doctors—for full benefits except in emergencies

This structure combines Original Medicare with a separate Medigap policy. Premiums and total costs vary by policy, company, location, rating method, eligibility, healthcare use, and any other coverage.

How Do They Compare?

Here are the main structural differences:

Medicare Advantage

• Plan premiums and cost-sharing vary by plan and location
• Copayments, coinsurance, deductibles, and service rules vary by plan
• May use provider networks; network rules vary by plan type
• Includes a yearly out-of-pocket limit for covered Part A and Part B services
• Usually includes Part D drug coverage, but plan benefits and rules vary

Medigap

• Requires a separate Medigap premium in addition to the Part B premium
• Helps pay certain Original Medicare cost-sharing according to the policy’s benefits
• Generally follows Original Medicare provider access nationwide
• Most standard policies do not use provider networks; Medicare SELECT is an exception
• Does not include modern prescription drug coverage; a separate Part D plan may be appropriate if you do not have other creditable drug coverage

Neither is “better.” The right choice depends on your priorities.

Things to Consider Before Choosing

When deciding between Medicare Advantage and Medigap, consider:

• How often you see doctors
• Whether you travel frequently or spend time outside the United States, Medicare coverage can work very differently when you’re traveling abroad or cruising internationally.
• Your comfort level with provider networks
• How each option’s premiums, cost-sharing, and yearly out-of-pocket exposure fit your situation
• Your long-term risk tolerance

Also remember: The federal Medigap Open Enrollment Period is a one-time six-month period that starts the first month you have Part B and are 65 or older. After it ends, an insurer may use medical underwriting unless you have a guaranteed issue right or additional protection under state law.

Understanding timing matters just as much as understanding structure.

Can You Switch Later?

Yes — but switching rules vary.

You can join, switch, or drop a Medicare Advantage plan during Medicare Open Enrollment (October 15–December 7), with other opportunities available in certain situations.

If you leave Medicare Advantage for Original Medicare and apply for Medigap later, an insurer may use medical underwriting unless you have a federal guaranteed issue right or additional protection under state law.

This is why making an informed decision upfront can be important.

Written & Reviewed by

Robin Dall

Florida Medicare Broker & Educator

Licensed Since 2013 • NPN 17032552

Robin Dall is a Florida Licensed Life, Health & Annuity Agent and founder of RobinsWisdom. This article was researched, written, and reviewed by Robin and reflects Medicare rules and guidance available at the time of publication.

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