By Christian BrinkleyLicensed NC Insurance Agent, NPN 22217190, NC Life & Health · Updated October 14, 2026 · 4 min read
One of the first big choices in Medicare is Medigap versus Medicare Advantage. They both work with Medicare, but in very different ways. You cannot have both for the same coverage. Understanding the difference helps you pick the path that fits your health, your doctors, and your budget.
Original Medicare Plus Medigap
Original Medicare is Part A, hospital insurance, plus Part B, medical insurance. It is run by the federal government. You can see any doctor or hospital in the country that accepts Medicare. No referrals. No network.
Original Medicare has cost sharing. You pay a Part A deductible for hospital stays, a yearly Part B deductible, then generally 20 percent coinsurance for Part B services. There is no yearly cap on what you pay out of pocket. That is where Medigap comes in.
Medicare Advantage
Medicare Advantage, also called Part C, is an alternative to Original Medicare. Private insurers approved by Medicare provide your Part A and Part B coverage, and usually Part D drug coverage, all in one plan.
Most Medicare Advantage plans have a network. HMO plans usually require you to stay in network except for emergencies, and often require referrals to see specialists. PPO plans let you go out of network, but you pay more when you do. Many plans require prior authorization for certain services.
Key Differences
Doctor choice: Original Medicare plus Medigap lets you see any doctor who accepts Medicare, anywhere, with no referrals. Medicare Advantage usually limits you to the plan network, and you may need referrals.
Drug coverage: with Medigap, you buy a separate Part D plan. With Medicare Advantage, drug coverage is usually built in.
Monthly cost: Medigap plus Part D means higher monthly premiums but lower costs at the point of care. Medicare Advantage means lower premiums but copays as you go, up to the out of pocket maximum.
Who Might Medigap Fit?
Medigap often fits people who want freedom and predictable costs. If you see specialists often, travel a lot, split time between states, or want no referrals, take a close look at Medigap.
It also fits people comfortable paying a higher monthly premium for lower costs when they need care. If you would rather pay more each month and worry less about a big hospital bill, Medigap may fit.
Who Might Medicare Advantage Fit?
Medicare Advantage often fits people who want lower monthly premiums and one all in one plan. If you are comfortable with a local network, referrals when needed, and copays as you go, it can be a good fit.
It also fits people who value the extra benefits, such as dental, vision, and hearing, if the network works for them. For people who do not travel much and like the simplicity of one card, Medicare Advantage can be easier to manage.
How to Decide
Start with your doctors. List them, then check which local Medicare Advantage plans include them. If keeping your doctors is non negotiable and they are not in any local network, Original Medicare plus Medigap may be safer.
Next, list your prescriptions. Use the Medicare Plan Finder at medicare.gov to compare total yearly costs on each option, including premiums, drug costs, and cost sharing.
Then think about how you use care. Do you see specialists often? Do you travel? Do you prefer the lowest monthly premium or the lowest cost when you get sick? Your answers point in one direction.
Getting Help
You do not have to decide alone. Your state SHIP program offers free, unbiased help. In North Carolina, it is called SHIIP. You can also call 1-800-MEDICARE or talk to a local licensed insurance agent who can check your doctors and prescriptions.
There is no one right answer for everyone. The right choice fits your doctors, your drugs, your budget, and how you want to get care.
This article is general information only. It is not personal advice or a recommendation about any specific plan.
Questions people ask me about this
Who might Medigap fit?
Medigap often fits people who want freedom and predictable costs. If you see specialists often, travel a lot, split time between states, or want no referrals, take a close look at Medigap. It also fits people comfortable paying a higher monthly premium for lower costs when they need care.
Who might Medicare advantage fit?
Medicare Advantage often fits people who want lower monthly premiums and one all in one plan. If you are comfortable with a local network, referrals when needed, and copays as you go, it can be a good fit. It also fits people who value the extra benefits, such as dental, vision, and hearing, if the network works for them.
How do I decide?
Start with your doctors. List them, then check which local Medicare Advantage plans include them. If keeping your doctors is non negotiable and they are not in any local network, Original Medicare plus Medigap may be safer. Next, list your prescriptions.
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