What it is
Medigap, also called Medicare Supplement Insurance, is sold by private insurance companies. It works alongside Original Medicare (Part A and Part B) and may help pay some of the out-of-pocket costs Original Medicare leaves behind, such as copayments, coinsurance and deductibles, depending on the plan letter you choose.
Medicare Advantage, also called Part C, is a different path. Private insurance companies offer plans that replace Original Medicare for day-to-day coverage. These plans must cover what Original Medicare covers, and many include extras such as prescription drug coverage or routine dental, vision and hearing benefits, depending on the plan.
The key difference is structure. With Medigap, you generally keep Original Medicare and add a supplement. With Medicare Advantage, you generally use the plan's rules, such as its provider network, referral requirements and cost-sharing design, in place of Original Medicare's. Neither is right for everyone.
How it’s traditionally been approached
People who prefer Medigap often value having broad choice of doctors and hospitals that accept Original Medicare, along with more predictable costs when they receive care. Trade-offs may include a separate monthly premium for the supplement and the need to add a separate prescription drug plan if they want drug coverage.
People who prefer Medicare Advantage often value having many benefits bundled into one plan, and plan designs that may have lower monthly premiums. Trade-offs may include network restrictions, prior authorization requirements, and out-of-pocket costs that can vary depending on the services used.
Many people weigh factors such as their health needs, how much they travel, which doctors they want to keep, their budget, and how comfortable they are with cost uncertainty. Rules about when you can switch plans, and whether you can be approved for a Medigap policy later, can differ by situation and state, so timing deserves attention.
How the right agent may help
An independent agent who works with Medicare plans may help you sort through these choices at your own pace. A conversation is generally a chance to share your doctors, medications, preferred pharmacies and budget, and to hear how different plan types might fit. It may also help to have someone explain the enrollment rules and timing in plain language.
Helpful questions to ask include: Which companies do you represent, and are there plans you cannot show me? Are my doctors and hospitals in the plan's network, if applicable? How might costs look if I have a major health event, not just a routine year? What happens if I want to change coverage later?
You can also ask how a plan handles prescription drugs, travel, and care outside your home area. For current premiums, benefits and enrollment dates, an agent, Medicare.gov, or 1-800-MEDIGAP can provide up-to-date information. A good agent should be comfortable explaining both options fairly.
The bigger picture
Choosing between Medigap and Medicare Advantage is about more than numbers. It affects how secure you may feel when you need care, how easily you can see the doctors you trust, and how much you worry about unexpected bills. Some people value predictability, others value flexibility or bundled extras, and both preferences are reasonable.
Taking time to understand your options may bring peace of mind and help you feel more in control of your health and finances. If you are also looking for trusted health professionals, Providers.plus is one place to explore. Remember that this page is educational and not personal advice.
Medicare News is an independent directory, not a professional advisor.
Keep in mind
- Neither Medigap nor Medicare Advantage is better for everyone; each has real advantages and trade-offs.
- Costs, benefits, plan availability and enrollment windows change every year, so confirm current details with Medicare.gov or 1-800-MEDIGAP.
- Rules for switching between the two options, and for Medigap approval, can depend on your situation and state.
- This page is educational only and is not medical, legal, tax or financial advice.
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Call 1-800-MEDIGAP →Frequently asked questions
What is the main difference between Medigap vs Medicare Advantage?
Medigap supplements Original Medicare, while Medicare Advantage replaces Original Medicare with a private plan. Medigap generally helps with out-of-pocket costs while you keep using Original Medicare. Medicare Advantage uses its own network and cost-sharing rules and may bundle extra benefits.
Can I have Medigap and Medicare Advantage at the same time?
Generally, no. Medigap is designed to work with Original Medicare, not with a Medicare Advantage plan. If you are in Medicare Advantage and are considering Medigap, an agent or Medicare.gov can explain how the rules work for your situation.
Does Medigap include prescription drug coverage?
No, Medigap policies sold today generally do not include prescription drug coverage. People who choose Medigap typically add a separate Medicare drug plan if they want that coverage. Many Medicare Advantage plans include drug coverage in the plan.
Do I need a network with Medigap or Medicare Advantage?
Medigap generally lets you see any doctor or hospital that accepts Original Medicare, without a plan network. Many Medicare Advantage plans use networks, and rules can vary by plan type. Checking whether your doctors participate is a common step before choosing.
Is Medigap or Medicare Advantage cheaper?
It depends on your health needs, how often you use care, and the specific plans available. Medicare Advantage plans often have lower monthly premiums but may have different cost-sharing when you use services, while Medigap often has a separate premium but more predictable costs. Call 1-800-MEDIGAP or visit Medicare.gov for current numbers.
Can I switch between Medigap and Medicare Advantage later?
Sometimes, but the rules and timing depend on your situation and state. Switching to Medigap later may involve medical questions in some cases, which could affect approval or cost. An independent agent can explain the options and deadlines that may apply to you.
Educational resource. Medicare News shares general information and connects people with independent agents. It is not professional advice. Talk with a qualified professional about your own situation.