Medigap vs. Medicare Advantage: An Honest Comparison

June 28, 2026 · 6 min read

By Kaleb Boedecker · Licensed Independent Insurance Agent (NPN 20642452) · June 28, 2026 · 6 min read

Picking between Medigap and Medicare Advantage comes down to one trade-off: freedom of provider versus a bundled, low-premium package. Medigap lets you see any doctor in the country who takes Medicare and gives you predictable costs. Advantage builds a network around you, adds extras, and asks you to stay inside it.

That trade-off is the whole decision, and most people get sold the answer before they understand the question. Let me lay out the real numbers and the real stakes before you pick a side.

Start with the figures that frame the choice. Medigap plans are standardized by letter — every Plan G from every carrier covers the same things, so you're only shopping price and service. There are ten standardized Medigap plans, lettered A through N (Plans C and F are closed to anyone who became Medicare-eligible in 2020 or later). You still pay the Part B premium either way — $202.90 a month in 2026. Medicare Advantage plans cap your in-network out-of-pocket spending at a federal maximum, which CMS sets at $9,250 for 2026, though many plans come in lower. Skip a Part D drug plan when you're first eligible and you can owe a late-enrollment penalty for life: 1% of the $38.99 national base premium for every month you went without coverage, added to your premium for good. And CMS rates Advantage plans on a 1-to-5 star scale.

If any of those numbers feel new, start with my new-to-Medicare walkthrough — it covers Part A and Part B before you ever pick a plan.

The $0-premium plan is not free

Here's the myth I fight every fall. A plan shows up with a $0 monthly premium and a shiny gold star next to it — "the only plan that offers this one specific thing, the best in the market." An older person gets sold it fast. Then they go to the doctor and find out their doctor is no longer in network, because the agent never did the work. The agent was chasing a check, since certain plans pay more.

$0 premium does not mean $0 cost. You're trading the premium for a network and for copays you pay when you actually get sick. The benefit looks bigger on the brochure precisely because the carrier is steering you. Seniors get targeted with this hardest, and the brochure is designed to make the trade invisible.

The stakes are real. MD Anderson in Houston, one of the largest cancer hospitals in the country, is out-of-network for every individual ACA marketplace plan in Texas and for all but a small set of Medicare Advantage plans. Blue Cross Blue Shield of Texas — one of the largest insurers in the state — dropped MD Anderson from its Medicare Advantage network in late 2024. So if you take a $0 Advantage plan and later get a serious diagnosis, the network you picked for the dental benefit can lock you out of the hospital you'd want most. A flashy extra is worthless if the door you need is closed. This is exactly why an honest independent agent matters here: the right plan is the one whose network holds when your health doesn't.

Side by side

There's no best plan in the abstract — only the best plan for your situation. Use this to find your own trade-off, not a "winner." Read each row against your own doctors, your own prescriptions, and how much surprise you can stomach in a bad year.

Feature	Medigap (Medicare Supplement)	Medicare Advantage (Part C)
Provider access	Any doctor or hospital in the US that accepts Medicare — no networks	Network-based (HMO/PPO/PFFS); out-of-network costs more or isn't covered
Monthly premium	A monthly premium on top of Part B, but predictable (the exact Plan G premium varies by age, ZIP, and carrier)	Often $0 or low premium
Out-of-pocket costs	Predictable; the plan fills Original Medicare's gaps	Copays and coinsurance until you hit the annual MOOP cap
Prescription drugs	Not included — you add a standalone Part D plan	Usually bundled in; check the formulary
Extras (dental/vision/hearing)	Not included	Frequently added — the headline selling point
How it changes	Benefits fixed by federal standardization (letter)	Benefits, networks, and costs can change every year; carries star ratings

The pattern: Medigap costs more monthly and buys you freedom and predictability. Advantage costs less monthly and asks you to live inside a network that the carrier can redraw each year. Neither is a trick — but one of them fits your doctors, your prescriptions, and your risk tolerance better than the other.

Who each one tends to fit

Medigap tends to fit people who travel, who split the year between two states, or who already have specialists and a hospital they won't switch. You pay more every month, but you trade that money for almost no surprises and a card every Medicare provider in the country will take. Advantage tends to fit people on a tight monthly budget, people who are healthy right now and want the dental and vision extras, and people whose doctors sit solidly inside a strong local network. The risk you accept is that the network and the drug list can move, and your costs ride up and down with how much care you use that year. Neither group is wrong. The mistake is picking the bucket that doesn't match your own life and finding out in the exam room.

Three things to know before you choose

1. Your doctors decide more than the premium. List the providers and hospitals you won't give up, then check each plan's network before anything else — a $0 premium means nothing if your specialist is out.
2. Switching back to Medigap isn't guaranteed. Once your six-month Medigap open-enrollment window closes, and outside a few guaranteed-issue situations, a carrier can medically underwrite you — so leaving Advantage for Medigap later can mean a higher rate or a flat denial.
3. Read the formulary, not the brochure. Pull up each plan's drug list and confirm your prescriptions are covered at a tier you can afford before you sign.

You can also compare Medigap and Advantage plans on the Medicare page, or read more about Kaleb Boedecker and how the no-cost model works. There's no reason not to use an agent — you don't pay anything for one.

Frequently asked questions

What is the main difference between Medicare Advantage and Medicare Supplement?

Medicare Supplement (Medigap) works alongside Original Medicare with no networks — any provider that takes Medicare works — and you add a separate Part D drug plan. Medicare Advantage replaces how you get your benefits through a private network plan that usually bundles drugs and extras like dental.

Can I switch from Medicare Advantage back to Medigap later?

Sometimes, but it's not guaranteed. Outside your six-month Medigap open-enrollment window — and a handful of guaranteed-issue situations — carriers can medically underwrite you, meaning health conditions can raise your rate or get you denied. That's why I treat the first choice as the one that matters most.

How do I know if my doctor takes a Medicare Advantage plan?

Check the plan's current provider directory and call your doctor's office directly to confirm — directories go stale. Networks also change yearly, so a doctor who's in this year may be out next year. Always verify a hospital's acceptance in writing before you assume your plan works there.

Does Medigap cover prescription drugs?

No. Medigap plans cover gaps in Original Medicare, not medications, so you'll enroll in a standalone Part D prescription drug plan alongside your Medigap policy. Skipping Part D when you're first eligible can trigger a lifelong late-enrollment penalty, so don't leave that piece out.

When can I enroll in or change my Medicare plan?

Most people start during their Initial Enrollment Period around turning 65, and the fall Annual Enrollment Period — October 15 to December 7 — lets you change plans for the next year. You enroll in Medicare itself through the Social Security Administration at ssa.gov, not through a private carrier.