Coverage & next steps

How to Decide Between Medicare Advantage and Medigap: A Step-by-Step Guide

Step by step

1. Get clear on the choice: you can pair Original Medicare with a Medigap supplement and a Part D plan, or you can enroll in a Medicare Advantage plan, but you cannot use Medigap and Medicare Advantage together.
2. List your must-keep doctors, specialists, and hospitals, then decide how much a nationwide, no-network option (Original Medicare with Medigap) is worth to you versus a networked Advantage plan.
3. Write down every prescription with its dosage so you can compare drug coverage, whether it comes bundled inside an Advantage plan or from a stand-alone Part D plan alongside Medigap.
4. Estimate your total yearly cost for each path by adding premiums, deductibles, and copays, and note that Medigap trades a higher premium for more predictable bills while Advantage often trades a lower premium for pay-as-you-go copays up to an out-of-pocket cap.
5. Check the timing: during your Medigap Open Enrollment window (generally the six months after your Part B starts at age 65 or older) you can typically buy a Medigap policy without medical underwriting, and this window matters if you might want to switch later.
6. Use the official Medicare Plan Finder at Medicare.gov to enter your ZIP code and see the specific Advantage plans, Part D plans, and, where shown, Medigap options available where you live.
7. Review your setup each year during the Annual Enrollment Period (October 15 to December 7), since Advantage and Part D networks, drug lists, and costs can change even if you do nothing.

FAQ

Can I have both Medicare Advantage and Medigap?

No. Medigap only works with Original Medicare and is not designed to pay costs under a Medicare Advantage plan. You generally choose one path or the other, and it is illegal for someone to sell you a Medigap policy if they know you are in a Medicare Advantage plan, except when you are switching back to Original Medicare.

Is Medigap or Medicare Advantage cheaper?

It depends on how you measure cost. Medicare Advantage often has a lower or $0 monthly plan premium but uses copays as you receive care, while Medigap usually has a higher premium in exchange for more predictable out-of-pocket bills. The cheaper path over a full year depends on your health, how much care you use, and where you live, so compare the total picture rather than the headline premium.

Can I switch from Medicare Advantage to Medigap later?

Sometimes, but it is not always guaranteed. Outside certain enrollment windows and guaranteed-issue situations, insurers can use medical underwriting for Medigap, which means your health history may affect whether you can buy a policy or what it costs. Because of that, it helps to understand the timing rules before you first choose a path.

Which Medicare plan is right for me?

There is no single right answer, since it comes down to your budget, prescriptions, preferred doctors, travel habits, and how predictable you want your costs to be. Freedom to see any Medicare provider points toward Original Medicare with Medigap and Part D, while a low premium with bundled extras points toward Medicare Advantage. The surest way to decide is to compare the specific plans offered in your ZIP code during an enrollment period.

Do I still need Part D with Medigap?

Usually yes. Medigap policies sold today do not include prescription drug coverage, so if you choose Original Medicare with Medigap you typically add a stand-alone Part D plan for your medications. Many Medicare Advantage plans, by contrast, already include Part D drug coverage in the same plan.

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