The Short Answer: Yes, But Medicare Part B Has to Approve It First
Medicare supplement plans do cover orthotics and prosthetics — and for most people with a good Medigap plan, they’ll cover most or all of what Medicare Part B doesn’t pay. But the coverage chain here matters a lot, and if you skip a step or work with the wrong supplier, you could end up on the hook for thousands of dollars out of pocket.
Here’s how it actually works. Medicare Part B covers orthotics and prosthetics as durable medical equipment (DME) when your doctor deems them medically necessary. Part B pays 80% of the Medicare-approved amount after you’ve met the 2026 Part B deductible, which is $257. Your Medigap plan then steps in to cover some or all of that remaining 20%, depending on which plan letter you have.
So if you’re asking whether you need a Medigap plan to protect yourself from prosthetic costs — the answer is almost always yes. A high-end prosthetic limb can cost $15,000 to $70,000 or more. Twenty percent of that is real money.
What Medicare Part B Actually Covers (And What It Doesn’t)
Before your Medigap plan can do anything, Part B has to say the device is covered. Medicare defines orthotics and prosthetics under its DME benefit, and the coverage is actually reasonably broad. But there are firm rules.
Part B covers:
- Prosthetic limbs (arms, legs, partial foot prosthetics)
- Ocular prostheses (artificial eyes)
- Orthotic devices like braces for the back, neck, knee, ankle, and wrist when prescribed by a doctor
- Replacement of prosthetics when there’s a medical reason (wear, change in condition)
- Repairs to covered prosthetics
Part B does not cover:
- Orthopedic shoes (with one narrow exception for people with severe diabetic foot disease)
- Supportive devices for feet in most circumstances
- Devices that aren’t prescribed by a physician
- Items purchased from a supplier who isn’t enrolled in Medicare
That last point trips people up constantly. I’ve seen it happen where someone buys a perfectly good brace or orthotic insert from a medical supply store, submits for reimbursement, and gets denied because the supplier wasn’t a Medicare-enrolled DME supplier. Always confirm your supplier is enrolled before you buy anything.
How Different Medigap Plans Handle the 20% Gap
This is where your plan letter makes a real difference. Not all Medigap plans cover the same share of the Part B coinsurance, so let’s be specific.
| Medigap Plan | Part B Deductible ($257 in 2026) | Part B Coinsurance (20%) | Your Out-of-Pocket for Orthotics/Prosthetics |
|---|---|---|---|
| Plan G | Not covered | 100% covered | $257 per year, then $0 |
| Plan N | Not covered | Covered (some copays may apply) | $257 per year, then usually $0 |
| Plan F (pre-2020 enrollees only) | 100% covered | 100% covered | $0 |
| Plan K | Not covered | 50% covered | $257 plus 10% of approved amount |
| Plan L | Not covered | 75% covered | $257 plus 5% of approved amount |
If you have Plan G, which is the most popular Medigap plan sold today and typically costs between $100 and $200 per month for a 65-year-old depending on your state and insurer, you’re in a good position. Once you’ve paid that $257 Part B deductible for the year (2026 figure), your Plan G covers the full 20% coinsurance. On a $30,000 prosthetic leg, that’s $6,000 in coinsurance that your Medigap plan absorbs completely.
Plan K and Plan L are the ones I’d be most cautious about if you have significant prosthetic or orthotic needs. They were designed to have lower premiums with more cost-sharing, which is fine if you’re healthy. But if you need a prosthetic limb, they leave you holding part of that coinsurance, and it can add up fast.
The Biggest Mistake People Make With Prosthetics and Medicare
In my experience, the single most costly mistake is going out of network with a DME supplier and not realizing until the bill arrives.
Here’s the thing. Medicare has what’s called a “participating supplier” system for DME. Suppliers can either accept assignment (meaning they agree to bill only the Medicare-approved amount) or they can charge more than the approved amount. If your supplier doesn’t accept assignment, they can charge up to 15% above what Medicare approves. That 15% excess charge is called the limiting charge, and most Medigap plans do not cover it. Plan G doesn’t cover excess charges. Plan N doesn’t either.
The only standard Medigap plans that cover Part B excess charges are Plan F (no longer available to new Medicare enrollees as of 2020) and Plan G High Deductible.
So if you have Plan G and your prosthetic supplier doesn’t accept Medicare assignment, you could be responsible for up to 15% of the approved amount on top of everything else. On a $40,000 prosthetic, the Medicare-approved amount might be $25,000, and 15% of that is $3,750 coming out of your pocket.
Always ask your DME supplier before any purchase: “Do you accept Medicare assignment?” If they don’t, find one who does. This one question can save you thousands.
Special Situations Worth Knowing About
A few scenarios come up often enough that they deserve their own space.
What About Custom Orthotics?
Custom orthotics from a podiatrist are a gray area that Medicare handles inconsistently. Medicare only covers foot orthotics in specific clinical situations, not as general arch support or comfort devices. If your doctor prescribes custom orthotics for a covered condition like severe diabetic neuropathy, Part B may cover them. If you’re buying them for plantar fasciitis or general foot pain, you’re almost certainly paying out of pocket, and your Medigap plan won’t help because Medicare didn’t approve the original claim.
Prosthetic Replacements
Medicare does cover replacement prosthetics, but the rules are strict. You typically need documentation showing the device is worn out, damaged beyond repair, or your condition has changed enough to require a different fit or type. Keep your doctor involved and make sure there’s a clear paper trail. Without it, a replacement claim can get denied, which means your Medigap plan has nothing to cover either.
People With Medicare Advantage Instead of Medigap
If you’re on a Medicare Advantage plan instead of Original Medicare plus Medigap, the rules are different. Advantage plans cover orthotics and prosthetics as required by Medicare, but your out-of-pocket costs depend entirely on your specific plan’s cost-sharing structure. Some Advantage plans have lower costs for DME, others have higher. You need to read your plan’s Evidence of Coverage carefully, or call the plan directly. This article is specifically about Medigap, but it’s worth knowing the distinction so you’re not comparing apples to oranges.
Bottom Line
For most people who need orthotics or prosthetics, Plan G is the right Medigap plan. It covers that 20% coinsurance completely after your $257 Part B deductible (2026), which on a major prosthetic device is thousands of dollars of protection for what amounts to a modest monthly premium. The most important things you can do are make sure your device is prescribed by a physician, use a Medicare-enrolled supplier who accepts assignment, and get that medical necessity documentation in writing before any purchase is made.
Frequently Asked Questions
Does Medicare pay for prosthetic limbs?
Yes. Medicare Part B covers prosthetic limbs when they’re prescribed as medically necessary by your physician. Part B pays 80% of the Medicare-approved amount after the annual deductible ($257 in 2026), and a Medigap plan like Plan G covers the remaining 20%.
Will Medicare cover a new prosthetic if the old one wears out?
Generally yes, but you’ll need documentation from your doctor showing the replacement is medically necessary. Prosthetics don’t have a fixed replacement schedule under Medicare — it’s based on medical need, not time elapsed. Keep detailed records and work closely with your physician on the paperwork.
Does Medicare cover back braces or knee braces?
Medicare Part B covers back braces, knee braces, and other orthotic devices when they’re prescribed by a doctor for a covered medical condition and supplied by a Medicare-enrolled DME provider. Over-the-counter braces you buy without a prescription generally aren’t covered.
What if my doctor says I need an orthotic but Medicare denies it?
You have the right to appeal. Your doctor can submit additional documentation supporting medical necessity. If Medicare ultimately denies the claim, your Medigap plan won’t cover it either since Medigap only pays after Medicare approves. That’s why getting solid documentation before the purchase matters so much — a denied claim becomes entirely your expense regardless of what Medigap plan you have.
