The Short Answer: Medigap Fills the Gap After Part B Pays First
Medicare supplement plans don’t cover durable medical equipment on their own — but they can pick up a significant chunk of what Medicare Part B leaves behind. That distinction matters more than most people realize, and getting it wrong can leave you with an unexpected bill for a wheelchair, CPAP machine, or home oxygen setup.
Here’s how it works at a basic level. Medicare Part B is the part of Original Medicare that covers durable medical equipment (DME). When you get an approved piece of equipment, Part B pays 80% of the Medicare-approved amount. You’re responsible for the remaining 20%, plus the 2026 Part B deductible of $257 if you haven’t met it yet. Your Medigap plan then steps in to cover some or all of what Part B didn’t pay, depending on which plan you have.
So yes, a good Medigap plan absolutely helps with DME costs. But the keyword there is “approved.” If Medicare Part B doesn’t approve the equipment in the first place, no Medigap plan on earth is going to cover it. That’s a wall a lot of people hit unexpectedly, and I’ll get into it more below.
What Counts as Durable Medical Equipment Under Medicare
Medicare defines DME pretty specifically. It has to be durable (meaning it can withstand repeated use), primarily used for a medical purpose, generally not useful to someone who isn’t sick or injured, and appropriate for use in the home. That’s the official definition, and it actually excludes a lot of stuff people assume would be covered.
Examples of equipment Medicare Part B does cover include:
- Wheelchairs and power scooters (with documentation requirements)
- CPAP machines and related supplies for sleep apnea
- Home oxygen equipment
- Hospital beds for home use
- Walkers and crutches
- Insulin pumps
- Blood glucose monitors (for insulin-treated diabetes)
- Nebulizers and certain respiratory equipment
Things that often don’t qualify include grab bars for the bathroom, stair lifts, non-prescription orthotics, and comfort items even if a doctor recommends them. I’ve talked to many people who assumed a doctor’s recommendation was enough for Medicare coverage. It’s not. The item has to meet Medicare’s definition, come from an enrolled Medicare supplier, and be deemed “medically necessary” based on your diagnosis.
Supplies related to covered equipment — like oxygen tubing, CPAP filters, or glucose test strips — are often covered under the same Part B umbrella. But again, there are limits. Medicare sets quantity limits on supplies, and going over those limits without documentation means you’re on your own.
Which Medigap Plans Actually Cover the DME Cost-Sharing
This is where plan selection gets real. Not every Medigap plan covers Part B coinsurance and the Part B deductible the same way. Let me lay this out simply.
| Medigap Plan | Part B Deductible ($257 in 2026) | Part B Coinsurance (20%) | Effectively Covers DME? |
|---|---|---|---|
| Plan G | You pay it once per year | Covered 100% | Yes, after deductible |
| Plan F (pre-2020 enrollees only) | Covered 100% | Covered 100% | Yes, fully |
| Plan N | You pay it once per year | Covered 100% | Yes, after deductible |
| Plan D | You pay it once per year | Covered 100% | Yes, after deductible |
| Plan K | You pay it once per year | Covered 50% | Partially |
| Plan L | You pay it once per year | Covered 75% | Partially |
If you have Plan G, here’s what a real situation looks like. Say you’re a 67-year-old in Ohio and you need a power wheelchair that Medicare approves at $2,000. Part B pays 80%, which is $1,600. You owe $400. If you’ve already met your $257 Part B deductible for 2026, Plan G covers that entire $400. You pay nothing extra. If you haven’t met the deductible yet, you pay $257, and Plan G picks up the rest.
Plan G premiums typically run $100 to $200 per month at age 65, depending on your state and the insurer. That may sound like a lot until you actually need a hospital bed, home oxygen equipment, and three months of CPAP supplies in the same year. At that point, the math shifts decisively in Plan G’s favor.
The Misconception That Trips People Up Most Often
I’ve seen this mistake more times than I can count: people assume that because they have a Medigap plan, their DME is “covered.” They get the equipment, they give their Medicare card and their Medigap card to the supplier, and they assume everything is handled. Then a bill arrives.
The problem usually isn’t the Medigap plan. The problem is that the supplier isn’t a Medicare-enrolled supplier, or the equipment wasn’t pre-authorized, or the doctor’s documentation didn’t satisfy Medicare’s medical necessity standards.
Medigap only pays its share of what Part B has already approved and paid its 80% on. If Part B denies the claim or pays nothing, your Medigap plan pays nothing either. Full stop. This is not a quirk or a technicality — it’s the fundamental design of how Medigap works. It supplements Medicare. It doesn’t replace it or override its coverage decisions.
A related mistake: buying equipment through a non-participating supplier because they’re cheaper or more convenient. If that supplier hasn’t accepted Medicare assignment, you can get hit with excess charges on top of the 20% coinsurance. Plan F covers those excess charges. Plan G does not. So if you’re on Plan G and your DME supplier is charging above Medicare’s approved amount, you’re absorbing that difference yourself.
The fix is simple. Always confirm that your supplier is enrolled in Medicare and accepts Medicare assignment before you commit to any equipment purchase. One phone call prevents a lot of headaches.
When Medicare Advantage Enters the Picture (And Why It Changes Everything)
If you have a Medicare Advantage plan instead of Original Medicare plus Medigap, the rules for DME are completely different. Medicare Advantage plans set their own cost-sharing structures for DME. Some plans have better coverage than Original Medicare for certain equipment. Many have worse coverage, or more restrictive networks for approved suppliers.
This matters because a lot of people in their late 60s and early 70s start on Medicare Advantage and then switch to Original Medicare plus Medigap when their health needs grow. By the time DME becomes a regular part of life, they may be past the guaranteed-issue window for Medigap enrollment. In most states, if you’re past 65 and you want to switch from Medicare Advantage to a Medigap plan, insurers can deny you or charge you higher premiums based on your health history.
I mention this not to alarm you but because it’s a real planning consideration. If you’re someone who has a chronic condition or a family history that suggests you’ll need significant medical equipment down the road, locking into a strong Medigap plan early is usually the smarter move. A 65-year-old who signs up for Plan G during their guaranteed-issue window can never be denied or repriced due to health status, no matter what comes later.
Bottom Line
For most people who need regular or expensive durable medical equipment, Plan G is the right call. It covers the 20% Part B coinsurance that would otherwise be your responsibility, and after you meet the $257 annual Part B deductible, you’re essentially paying nothing out of pocket for approved DME. The key word, as always, is “approved” — make sure your supplier accepts Medicare assignment and your doctor documents medical necessity properly, or no Medigap plan will save you. Don’t wait until you need the equipment to get serious about your coverage.
Frequently Asked Questions
Does Medicare supplement cover CPAP supplies?
Yes, if Medicare Part B approves the underlying CPAP equipment and related supplies, a Medigap plan like Plan G will cover the 20% coinsurance that Part B doesn’t pay. Part B covers CPAP machines and supplies for diagnosed obstructive sleep apnea, but you must use a Medicare-enrolled supplier and your doctor needs to document your diagnosis properly. Without Part B approval, your Medigap plan won’t pay anything toward it.
What if I need a power wheelchair or scooter?
Power wheelchairs and mobility scooters are among the most documentation-heavy DME categories in Medicare. Part B requires a face-to-face exam with your doctor, a detailed written order, and in some cases an in-home assessment. If all that is done correctly and Part B approves the claim, your Medigap plan covers the 20% coinsurance as normal. If Medicare denies the claim, which happens often with mobility equipment, you can appeal. But your Medigap plan’s coverage doesn’t kick in until Part B approves and pays its 80%.
Will Medigap cover home oxygen equipment?
Yes. Home oxygen is covered under Part B when it’s medically necessary, typically documented through blood oxygen level testing ordered by your doctor. Medicare pays 80% of the approved rental and supply costs, and a solid Medigap plan like Plan G covers the remaining 20% after you’ve met the annual Part B deductible. This one tends to work smoothly as long as you’re working with a Medicare-enrolled home health equipment supplier.
Can I get Medigap coverage for equipment Medicare denies?
No. Medigap has no independent coverage for DME. It only covers the cost-sharing portion of claims that Original Medicare has already approved and paid on. If Part B denies a piece of equipment as not medically necessary or not meeting its definition of DME, your Medigap insurer will not step in. Your options at that point are to appeal the Medicare denial, pay out of pocket, or look at whether any supplemental coverage you have (like a standalone vision or dental add-on policy) might apply, which in the case of most DME it won’t.
