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Medicare Advantage vs. Medigap: The Real Difference

Austin TylerLocal Kentucky Medicare agent · June 3, 2026 · 6 min read

This is the question I get more than any other: "Should I go with a Medicare Advantage plan or a supplement?" Both are popular, both are legitimate, and the right answer genuinely depends on the person. But most folks are comparing them on the wrong things — usually just the monthly premium. Let me show you what actually matters.

First, what they're both trying to fix

Original Medicare (Part A and Part B) is good coverage, but it has gaps. After your deductibles, Part B generally pays about 80% and you pay the other 20% — with no cap on what that 20% can add up to in a bad year. In 2026 the Part B deductible is $283 and the inpatient hospital deductible is $1,736 per benefit period.

There are two different ways to deal with those gaps. You pick one:

Medicare Advantage (Part C) — a private plan that replaces how you get your Medicare, usually bundling in drug coverage and extras.
A Medigap supplement — a private policy that works alongside Original Medicare and pays the gaps it leaves behind (you add a separate Part D drug plan).

The side-by-side

	Medicare Advantage	Medigap (Supplement)
Monthly premium	Often low or $0 (you still pay your Part B premium)	Higher — a set monthly premium
Doctors	Network-based (HMO/PPO); referrals & prior approval common	Any doctor or hospital in the U.S. that takes Medicare
Costs when you get care	Copays & coinsurance as you go, up to a yearly out-of-pocket max	Little to nothing at the point of care (depends on plan)
Drug coverage	Usually built in	Separate Part D plan needed
Extras (dental, vision, etc.)	Often included	Not included
Best for	Lower upfront cost, OK with a network	Predictability & freedom to go anywhere

The trade-off in one sentence

Medicare Advantage usually costs less when you're healthy; Medigap usually costs less when you're sick. Advantage keeps your monthly bill low but you pay as you use care, within a network and sometimes after prior authorization. Medigap costs more every month but smooths everything out — you can see almost any doctor, and your bills are predictable even in a rough year.

If you're here in the Bluegrass, the network question usually comes down to one thing: is your hospital covered? See Which Lexington Hospitals Take Medicare Advantage? for how UK HealthCare, Baptist Health, and CHI Saint Joseph fit in — or the full local Medicare guide for Lexington.

Good news on drug costs either way. Starting in 2025, Medicare put a hard cap on what you pay out of pocket for covered prescription drugs each year. In 2026 that cap is $2,100. It applies whether your Part D is built into an Advantage plan or it's a standalone plan paired with Medigap.

The part most people miss: medical underwriting

Here's the catch that makes this decision bigger than it looks. When you first turn 65 and enroll in Part B, you get a 6-month Medigap Open Enrollment Period. During that window, a supplement company must sell you a policy — they can't turn you down or charge you more for your health history.

After that window closes, in most states — Kentucky included — buying or switching a Medigap policy can require medical underwriting. That means the insurer can review your health and deny you or charge more. (Only a handful of states, like New York and Massachusetts, guarantee Medigap year-round.)

Why does that matter for this choice? Because if you start on Medicare Advantage and later decide you want the freedom of Medigap, you may have to pass underwriting to get it — and if your health has changed, that door can be hard to open. It's not impossible, and there are special situations that protect you, but it's the single most important thing to understand before you choose.

Bottom line: Don't pick on premium alone. Think about the doctors you want to keep, how predictable you need your costs to be, and the underwriting rules down the road. That's a 15-minute conversation — and it's worth getting right the first time.

Still torn between Advantage and Medigap? You can get a free, no-pressure Medicare review. A local Kentucky agent will compare both against your own doctors and prescriptions — at no cost.

Quick recap

Original Medicare leaves gaps with no cap on your share — you fill them with either Medicare Advantage or a Medigap supplement.

Advantage usually costs less monthly but uses networks and prior authorization.

Medigap costs more monthly but lets you see almost any doctor, with predictable costs.

A separate Part D drug plan pairs with Medigap; Advantage usually builds drug coverage in.

Switching from Advantage to Medigap later can require medical underwriting in Kentucky — so choose carefully up front.

Test what you learned

Five quick questions — pick an answer to see if you're right, and why.

Not sure which one fits your life?

Take the 2-minute "Advantage or Supplement?" quiz, or call me and we'll talk it through for your situation — no cost, no pressure.

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Or call me directly: (859) 618-6443

This article is general information, not advice for your specific situation, and Medicare rules and figures can change. 2026 amounts are from CMS. Tyler Insurance Group is not connected with or endorsed by the U.S. government or the federal Medicare program. We do not offer every plan available in your area. For complete details on all your options, contact Medicare.gov or 1-800-MEDICARE.