If you’re turning 65 or already on Medicare, you’ve probably run into the same question every retiree faces: Medicare Advantage or Medigap? It’s the single biggest decision in Medicare, and the wrong choice can cost you thousands — or worse, leave you without the coverage you need when it matters most.
Here’s what you need to know to make the right call for your situation.
What is Medicare Advantage?
Medicare Advantage (also called Part C) is an all-in-one alternative to Original Medicare, offered by private insurance companies. These plans bundle your Part A (hospital) and Part B (medical) coverage into a single plan, and many include prescription drug coverage (Part D) as well.
Most Medicare Advantage plans also include extras that Original Medicare doesn’t cover — things like dental, vision, hearing, fitness programs, and telehealth. Some plans even offer transportation to medical appointments or over-the-counter health product allowances.
The tradeoff? Medicare Advantage plans typically work through provider networks. If you have a favorite doctor or specialist, you’ll need to check whether they’re in the plan’s network before you enroll.
Medicare Advantage at a glance
- Monthly premium: Many plans offer $0 premiums beyond your Part B premium ($203 in 2026)
- Out-of-pocket costs: Copays and coinsurance each time you use services
- Annual out-of-pocket maximum: Caps your exposure, but the cap ranges from roughly $3,000 to over $8,000 depending on the plan
- Provider network: HMO or PPO — you generally need to stay in-network
- Prescription drugs: Often bundled in (Part D)
- Extras: Dental, vision, hearing, fitness, and more
What is Medigap?
Medigap (Medicare Supplement Insurance) is a private insurance policy designed to fill the gaps in Original Medicare. It doesn’t replace Original Medicare — it works alongside it. Medicare pays its share first, and Medigap covers its portion of the remaining costs like deductibles, copayments, and coinsurance.
When you have a Medigap plan, you keep your Original Medicare coverage. You can see any doctor or specialist in the country that accepts Medicare — no network restrictions, no referrals needed.
There are currently 10 standardized Medigap plan types (A, B, C, D, F, G, K, L, M, N). Plans C and F are no longer available to people who first became eligible for Medicare on or after January 1, 2020. The most popular plans for new enrollees are Plan G and Plan N.
Medigap at a glance
- Monthly premium: Varies by plan, age, location, and tobacco use — typically $100 to $300+ per month in addition to your Part B premium
- Out-of-pocket costs: Very predictable. Plan G, the most popular option, covers nearly all gaps after the annual Part B deductible ($257 in 2026)
- Annual out-of-pocket maximum: None needed — your cost-sharing is already minimal and predictable
- Provider network: No network. See any Medicare-accepting provider nationwide
- Prescription drugs: Not included — you’ll need a standalone Part D plan
- Extras: Not typically included, though some carriers offer fitness or wellness perks
The key differences
This is where the choice gets real. Let’s compare them side by side.
Cost structure. Medicare Advantage plans often look cheaper on the surface — many have $0 monthly premiums. But you pay copays and coinsurance every time you see a doctor, visit the ER, or get a procedure. Over time, those costs add up, especially if you have chronic conditions that require frequent care. Medigap plans have a higher monthly premium, but your out-of-pocket costs at the point of care are minimal and predictable.
Provider access. This is the biggest lifestyle difference. Medicare Advantage plans use networks. If your doctor leaves the network — which happens more often than people realize — you either switch doctors or pay full price. Medigap gives you freedom. Any doctor, any hospital, anywhere in the country that accepts Medicare.
Prescription drugs. Medicare Advantage plans often bundle Part D drug coverage, which is convenient. With Medigap, you’ll need to enroll in a separate Part D plan. That’s one more thing to manage, but it also means you can choose the Part D plan that best fits your specific medications.
Predictability. Medigap plans offer a very stable, predictable cost structure. You know your premium, you know your deductible, and that’s essentially it. Medicare Advantage plans can be harder to predict — costs vary based on how much care you use, and plans can change their networks, formularies, and benefits from year to year.
Travel and geographic flexibility. If you spend part of the year in another state — snowbirds, for example — Medigap works anywhere in the U.S. that accepts Medicare. Medicare Advantage plans are generally limited to a specific service area, which may or may not include where you travel.
Who tends to benefit from Medicare Advantage?
Medicare Advantage plans tend to work well for people who:
- Want a low or $0 monthly premium and are generally healthy
- Don’t mind staying within a network of providers
- Want dental, vision, and hearing coverage bundled into one plan
- Are comfortable with a cap on out-of-pocket spending
- Don’t travel frequently outside their service area
- Are OK with prior authorization requirements for certain services
Who tends to benefit from Medigap?
Medigap plans tend to be the better fit for people who:
- Want to keep their current doctors without worrying about network changes
- Travel between states or spend part of the year elsewhere
- Prefer predictable, easy-to-budget healthcare costs
- Have chronic conditions that require frequent doctor visits or procedures
- Want the flexibility to see specialists without referrals
- Don’t mind managing a separate Part D plan for prescription drugs
The timing question
There’s an important window you need to know about. When you first become eligible for Medicare at age 65, you have a six-month Medigap open enrollment period. During this time, any Medigap insurer must sell you any plan they offer, regardless of pre-existing conditions. After this window closes, insurers can decline coverage or charge more based on your health.
This is why many Medicare specialists recommend enrolling in Medigap during your initial enrollment — even if you think you might prefer Medicare Advantage. If you start with Medigap and decide to switch to Advantage later, you can usually do so during the annual Medicare Advantage open enrollment period (January 1 through March 31). But going the other direction — from Advantage to Medigap — is much harder after your initial enrollment period has closed.
What about the extras?
Medicare Advantage plans include extras like dental, vision, and hearing that Medigap doesn’t. But these extras are often basic — a routine cleaning here, an annual vision exam there. If you need significant dental work, a hearing aid, or more comprehensive vision coverage, standalone dental and vision policies may give you better coverage anyway. The “free extras” in Medicare Advantage can sometimes be more marketing than substance.
The bottom line
There’s no universally “better” option. The right plan depends on your health, your budget, your tolerance for network restrictions, and your priorities. A healthy 65-year-old who rarely sees a doctor and wants low monthly costs may find a Medicare Advantage plan appealing. A 65-year-old with a chronic condition who travels between states may find Medigap worth every penny of the premium.
What matters most is that you understand both options before you choose — and that you get guidance from someone who can show you what’s available from multiple carriers, not just one.
Talk to a Trek agent
At Trek Insurance Solutions, we work with multiple Medicare carriers to help you compare Medicare Advantage and Medigap plans side by side. We’ll walk through your health needs, your budget, and your lifestyle to help you find the plan that fits — without pressure, and without obligation.
Disclaimer: This content is for educational purposes only and does not constitute insurance advice. Coverage, premiums, and availability vary by carrier, state, and individual factors. Contact a licensed agent to discuss your specific situation.