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Does Medicare Supplement Cover Preventive Care Screenings?

The Short Answer: Medigap Follows Medicare’s Lead

Medicare supplement insurance doesn’t cover preventive care screenings on its own. It covers your cost-sharing after Medicare Part B pays its share. That distinction sounds small, but it changes everything about how you plan for your healthcare costs.

Here’s the thing. Medicare Part B already covers a genuinely impressive list of preventive screenings at no cost to you, provided certain conditions are met. When those screenings are billed correctly and you’ve met your deductible requirements, Medigap steps in to handle whatever cost-sharing remains. The result is that many people on a strong Medigap plan like Plan G end up paying nothing out of pocket for covered preventive services.

But “many people” is not “all people,” and the exceptions matter a lot. I’ve seen retirees get blindsided by bills they assumed Medigap would handle, and in almost every case, the confusion came down to one of three things: a service that wasn’t technically “preventive,” a provider who didn’t accept Medicare assignment, or a screening that crossed into diagnostic territory. We’ll cover all of it.

What Medicare Part B Actually Covers for Prevention

Before you can understand what Medigap does, you need to know what Medicare does. Part B covers a wide range of preventive screenings, and for most of them, your cost-sharing is zero as long as the visit is coded and billed correctly.

Here are some of the key preventive services Part B covers at 100% with no cost to you:

For all of these, when billed as preventive, Medicare pays 100% and there’s no Part B deductible applied. That’s the law. And because there’s no cost-sharing left over, Medigap has nothing to pay. Which is actually fine, because you owe nothing.

The 2026 Part B deductible is $257. It does not apply to these preventive screenings when they’re billed correctly. Keep that number in mind, because it becomes relevant the moment a service stops being “purely preventive.”

The Diagnostic Trap: The Mistake That Costs People Real Money

This is the section I wish someone had written for my readers years ago, because I’ve seen this mistake happen over and over.

You go in for your free screening colonoscopy. Your doctor finds a polyp and removes it. You get the bill. Now you owe money. How did that happen?

When a preventive screening produces a finding that requires treatment during the same visit, the billing often changes. The procedure gets reclassified, partially or fully, as diagnostic or therapeutic. At that point, Medicare’s 100% preventive coverage no longer applies to the whole bill. You may be on the hook for 20% of the Medicare-approved amount for part of the service.

This is not a billing error. It’s just how the rules work. Medicare treats screenings and treatment as different things, even when they happen in the same room on the same day.

Here’s where Medigap earns its keep. If you have Plan G, your plan would typically cover that 20% coinsurance after you’ve met the 2026 Part B deductible of $257. If you haven’t met your deductible yet that year, you’d owe the deductible first, then Medigap covers the rest. Plan F (for those grandfathered in before January 1, 2020) would cover the deductible too.

So while Medigap doesn’t technically “cover preventive screenings,” it does protect you from the financial fallout when a screening turns into something more. That’s actually one of the best arguments for having a strong Medigap plan if you’re at the age where screenings regularly turn up findings worth investigating.

How the Main Medigap Plans Stack Up on Preventive-Related Costs

Not all Medigap plans handle cost-sharing the same way. Here’s a practical breakdown of how the most popular plans handle the costs you might face when a screening produces cost-sharing:

Medigap Plan Covers Part B Deductible ($257 in 2026)? Covers Part B 20% Coinsurance? Best For
Plan G No Yes Most new enrollees (available post-2020)
Plan F Yes Yes Grandfathered enrollees only (pre-2020)
Plan N No Yes (with some copays) Healthier people who rarely see specialists
Plan K No 50% (not full coverage) Lower-premium seekers willing to share more risk
Plan L No 75% (not full coverage) Middle-ground option with lower premiums

My honest take: for most people I work with, Plan G is the right call. At age 65 in 2026, you’re typically looking at $100 to $200 per month depending on your state and which insurer you use. Ohio, for example, tends to run toward the lower end of that range. You pay the $257 deductible once a year and then you’re fully covered for Medicare-approved costs. That’s a simple, predictable structure that most people find worth the premium.

Plan N is worth considering if you’re healthy and want a lower premium, but you’ll face copays of up to $20 for office visits and $50 for emergency room visits that don’t result in inpatient admission. For screenings that turn diagnostic, those copays can add up.

What Medigap Won’t Help With, Even on a Premium Plan

There are real gaps in preventive care coverage that no Medigap plan fixes, and I’d rather tell you about them now than have you find out the hard way.

Services Medicare doesn’t cover at all. Medigap can only cover your share of Medicare-approved costs. If Medicare denies a claim entirely, Medigap won’t pay either. Routine dental, vision, and hearing are the big three. A hearing screening at your annual wellness visit might be included, but hearing aids and most dental work are completely outside the Medicare and Medigap system. You’d need a separate plan for those.

Out-of-network providers who don’t accept Medicare assignment. If a provider doesn’t accept Medicare assignment, they can charge up to 15% more than the Medicare-approved amount. Medigap plans generally don’t cover this “excess charge” unless you have Plan F or Plan G, which do cover excess charges. This is another reason Plan G is worth the premium in my opinion.

Prescription drugs. Preventive medications, like statins recommended after a cardiovascular screening or medications prescribed based on a diabetes screening result, aren’t covered by Medigap. You need Part D for that. Don’t forget to enroll in a Part D plan even if you’re not currently taking prescriptions. The late enrollment penalty is unforgiving.

Screenings not yet approved by the USPSTF. Medicare largely follows the U.S. Preventive Services Task Force recommendations. If a screening isn’t on that list, Medicare probably won’t cover it. Your doctor might recommend it, but that doesn’t mean Medicare will pay for it.

Bottom Line

For the vast majority of Medicare beneficiaries, a plan like Medigap Plan G combined with Medicare Part B gives you strong protection on preventive care. Most screenings are free under Part B, and when a screening leads to a finding that creates cost-sharing, Plan G handles that 20% coinsurance after your $257 annual deductible. The one mistake to avoid is assuming that “free preventive screening” means “free no matter what happens during that appointment.” It doesn’t, and that’s exactly the kind of gap Medigap is built to catch.

Frequently Asked Questions

Does Medigap cover the Annual Wellness Visit?

The Annual Wellness Visit is covered at 100% by Medicare Part B with no cost-sharing, so there’s nothing left for Medigap to cover. You won’t get a bill for it. The catch is that if your doctor addresses other health concerns during the same visit and bills them separately, that additional portion may trigger cost-sharing that Medigap would then cover.

Will my colonoscopy be free if I have Medigap?

A routine screening colonoscopy with no findings is free under Medicare Part B. If a polyp is found and removed during the same procedure, the billing often shifts and you may owe cost-sharing. If you have Plan G, Medigap would cover that coinsurance after your annual deductible. Without Medigap, that 20% coinsurance can easily be several hundred dollars.

Does Medigap cover preventive care differently than regular medical care?

No. Medigap doesn’t distinguish between preventive and non-preventive care. It covers your cost-sharing on Medicare-approved services regardless of the type of care. The reason preventive care feels “free” is that Medicare waives the cost-sharing on those services, leaving nothing for Medigap to pay. When cost-sharing exists, Medigap covers it based on your plan’s benefits.

I just turned 65. Should I get Medigap before I have any screenings scheduled?

Yes, and the timing matters more than people realize. Your Medigap Open Enrollment Period starts the month you’re both 65 and enrolled in Part B. During that window, no insurer can deny you coverage or charge you more based on health history. If you wait until after a screening turns up a significant finding, you could face medical underwriting and potentially be denied or charged much higher premiums. Enroll during that window even if you feel perfectly healthy.

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