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Medicare Advantage vs Medigap: how to choose

Once you have Medicare, there are two main ways to cover what Original Medicare does not pay. Here is how each one works, in plain words, so you come to your appointment with the right questions.

Updated October 4, 2026

First: what Original Medicare covers

Original Medicare is Part A (hospital) and Part B (doctors, tests and outpatient care). After the deductible, Part B usually pays 80% of the approved amount and you pay the other 20%.

Original Medicare has no yearly limit on out of pocket costs, and it does not include prescription drugs. That is why most people add other coverage.

Path 1: Medigap plus a drug plan

A Medigap policy (also called Medicare Supplement Insurance) helps pay the copays, coinsurance and deductibles that Original Medicare leaves.

You can see any doctor or hospital in the country that accepts Medicare, with no network and usually no referrals.

Medigap does not cover prescriptions, so it is paired with a Part D drug plan. You pay a monthly premium for each, on top of the Part B premium.

Path 2: Medicare Advantage (Part C)

A Medicare Advantage plan is offered by a private company approved by Medicare. You are still in Medicare, but the plan provides your Part A and Part B benefits.

Many plans include drug coverage and extra benefits such as dental, vision or hearing. Benefits vary by plan and change from year to year.

Most use a network of doctors and hospitals. Every plan has a yearly limit on out of pocket costs for in network services.

You still pay the Part B premium.

Timing matters

The best time to buy a Medigap policy is your Medigap Open Enrollment Period: the 6 months that start the month you are 65 or older and enrolled in Part B. During those months the company cannot turn you down or charge you more because of your health.

After that window, in most cases the company can ask health questions before accepting you.

Medicare Advantage plans can be changed every year from October 15 to December 7. If you already have a Medicare Advantage plan, you can make one change from January 1 to March 31.

Four questions to decide

Want to review your situation?

Carmen Landis, a licensed Florida health insurance agent, goes over your doctors and your prescriptions with you. Our help is at no cost to you and does not obligate you to enroll.

Common questions

Can I have Medicare Advantage and Medigap at the same time?

No. A Medigap policy only works with Original Medicare. If you join a Medicare Advantage plan, the Medigap policy would not pay anything.

Can I switch from Medicare Advantage to Medigap later?

You can go back to Original Medicare from October 15 to December 7, or from January 1 to March 31 if you already have Medicare Advantage. But outside your Medigap Open Enrollment Period the company can ask health questions, except in certain cases where the law gives you a guaranteed right.

Which one is better?

It depends on your doctors, your prescriptions, your budget and whether you travel. That is why it helps to compare them with your list in hand.

More guides

Official information: Medicare.gov or 1-800-MEDICARE (1-800-633-4227), 24 hours a day.