If you're approaching 65 (or helping a parent who is), you've probably heard a hundred ads for "Medicare Advantage" and "Medicare Supplement" plans, often in the same breath, as if they're the same thing. They're not. They are two very different ways to get the coverage Original Medicare leaves out, and the choice between them shapes your costs, your doctor access, and your flexibility for the rest of your life.
This is a plain-English breakdown of Medicare Advantage vs Medicare Supplement, written by a licensed Florida agent who walks people through this decision every week.
First, a Quick Refresher on Medicare
Original Medicare has two parts:
- Part A, hospital insurance. Inpatient stays, skilled nursing facility, hospice, some home health.
- Part B, medical insurance. Doctor visits, outpatient care, preventive services, durable medical equipment.
Original Medicare covers a lot, but it has gaps. There is no out-of-pocket maximum, no prescription drug coverage, and Part B only pays 80% of approved charges, you're on the hook for the other 20%, with no cap. On a serious illness, that 20% adds up fast.
That gap is what Medicare Advantage and Medicare Supplement (Medigap) plans are designed to fill. They just fill it in completely different ways.
What Is Medicare Advantage (Part C)?
Medicare Advantage is a Medicare-approved plan from a private insurance company that replaces Original Medicare. You're still in Medicare, but the private carrier, not the federal government, pays your providers.
Most Medicare Advantage plans in Florida are HMOs or PPOs. Most bundle in Part D prescription drug coverage. Many advertise extras like dental, vision, hearing, gym memberships, and over-the-counter allowances.
Premiums are often low, sometimes $0 on top of your Part B premium, because you're agreeing to use the plan's network and follow its rules in exchange.
What Is a Medicare Supplement (Medigap) Plan?
A Medicare Supplement (also called Medigap) is a private plan that sits on top of Original Medicare. You keep Original Medicare as your primary coverage, and Medigap pays most or all of what Medicare doesn't.
Medigap plans are standardized by letter (Plan G, Plan N, Plan F if you were eligible before 2020, and others). A Plan G from one carrier covers exactly the same things as Plan G from another carrier, the only differences are price and customer service.
Medigap doesn't include prescription drugs, so you pair it with a stand-alone Part D plan.
Side-by-Side Comparison
| Feature | Medicare Advantage | Medicare Supplement (Medigap) |
|---|---|---|
| How it works | Replaces Original Medicare | Pays after Original Medicare |
| Monthly premium | Often $0–$50 (plus Part B) | Typically $100–$250 (plus Part B and Part D) |
| Doctor network | HMO/PPO network, in-network is much cheaper | Any provider in the U.S. that accepts Medicare |
| Out-of-pocket maximum | Yes (set annually by Medicare) | Effectively very low, Plan G covers nearly everything after the Part B deductible |
| Referrals to specialists | Often required on HMOs | Never required |
| Prescription drugs | Usually built in | Add a separate Part D plan |
| Extras (dental/vision/gym) | Often included | Usually not, buy stand-alone if needed |
| Coverage when you travel | Network-limited; emergencies covered | Nationwide; some include foreign travel emergency |
| Underwriting to switch later | Generally not required | Required outside your initial enrollment window |
The Hidden Catch With Medicare Advantage
Low premiums are real, and so are the extras. But Medicare Advantage trades flexibility for that low cost. You pay copays and coinsurance as you use the plan, up to the out-of-pocket maximum, which in 2026 can still be several thousand dollars per year. If you develop a serious condition, that's when the trade-off shows up.
You also have to stay in-network in most cases. If your preferred specialist isn't in the plan's network, you either switch doctors or pay much more.
Don't gloss over this
Switching from Medicare Advantage back to a Medigap plan later usually requires you to pass medical underwriting. If your health has changed since 65, you could be denied. Florida is also one of the few states with limited "birthday rule" guarantees for Medigap, which makes the initial choice even more important.
The Hidden Catch With Medigap
Medigap delivers near-total predictability, you pay your monthly premium, and most everything else is covered, but you pay for that predictability up front. Premiums are higher than Advantage. They also tend to increase as you age. And you'll need a separate Part D plan and stand-alone dental/vision if you want them.
For people on fixed incomes, the monthly cost can sting, even if the long-term math works out.
How to Choose: A Practical Framework
I ask new Medicare clients these five questions before recommending anything:
- How is your health today, honestly? If you're managing chronic conditions or have frequent specialist visits, the predictable costs of a Medigap plan often save money over the year.
- Are your preferred doctors in the Advantage plan's network? If they aren't, or you don't want to be locked into one network, Medigap's any-provider freedom is hard to beat.
- Do you travel often or split time between two states? Snowbirds living between Florida and the Northeast almost always do better with Medigap.
- What's your budget, this year and ten years from now? Advantage minimizes the monthly bill; Medigap minimizes the surprise bill. Both matter.
- What prescriptions do you take? Pricing a Part D plan or the drug formulary inside an Advantage plan can swing the total cost by hundreds of dollars per year.
When Can You Enroll or Switch?
Three windows matter:
- Initial Enrollment Period (IEP): The seven-month window around your 65th birthday. This is the best time to choose Medigap, carriers in Florida generally can't medically underwrite you during this window.
- Annual Election Period (AEP): October 15 to December 7 every year. You can join, switch, or drop a Medicare Advantage or Part D plan.
- Medicare Advantage Open Enrollment Period: January 1 to March 31. If you're already in an Advantage plan, you get one chance to switch to a different Advantage plan or back to Original Medicare (with Part D).
Outside those windows, Special Enrollment Periods exist for things like moving, losing employer coverage, or a plan leaving Medicare. Don't assume you have to wait if your situation changes.
A Word on Florida Specifically
Florida has more Medicare beneficiaries than almost any other state, which means an enormous number of plan choices, and an enormous amount of aggressive marketing. The TV commercials with celebrity spokespeople are advertising one specific kind of plan (usually Medicare Advantage), and they make it sound like the only option. It is not.
Plan availability and pricing in Florida also vary dramatically by county. A great Advantage plan in Broward may not exist in Highlands. A competitive Medigap rate in Miami-Dade may be very different in Polk. A local agent who actually looks up plans in your specific zip code beats a national 1-800 line every time.
So, Which One Is Right for You?
If I had to summarize the difference in one sentence: Medicare Advantage minimizes your monthly cost and trades flexibility for low premiums. Medicare Supplement maximizes flexibility and trades higher premiums for predictability.
Neither is universally better. The right answer depends on your health, your doctors, your travel patterns, your prescriptions, and your budget. That's exactly the conversation I have with every Medicare client, and there's no cost to have it.
Get Personalized Medicare Guidance
I'll compare Advantage and Medigap plans in your specific Florida county, check your doctors, and price your prescriptions side by side. No pressure, no obligation.
Talk to Sheryl