Your doctor mentioned hyperbaric oxygen therapy for a wound that won't heal, and now you're wondering whether Medicare will actually pay for it. The short answer: sometimes. Medicare covers hyperbaric oxygen (HBO) therapy only for a specific list of approved conditions, and if yours isn't on that list, it won't be covered at all.

In This Guide

What Does Medicare Cover Hyperbaric Oxygen Therapy For?

Whether Medicare pays comes down to one thing: your condition. Medicare Part B pays for HBO therapy only when it's delivered in a pressurized chamber (including a one-person unit) and you have one of the conditions spelled out in a federal rule called National Coverage Determination 20.29. This isn't a judgment call your local doctor gets to make on their own. The condition has to be on the list.

So what's on the list? A mix of acute emergencies and stubborn chronic problems. Medicare's approved conditions include acute carbon monoxide poisoning, gas gangrene, progressive necrotizing infections (the fast-spreading tissue infections), chronic refractory osteomyelitis (a bone infection that keeps coming back), and diabetic wounds of the lower limbs that meet a strict set of criteria.

For most families reading this, it's the diabetic wound that brings them here. That one has its own rulebook, so it's worth walking through carefully.

The Diabetic Wound Rule

A non-healing diabetic foot or leg wound is one of the most common reasons HBO therapy gets prescribed, and it's also where Medicare draws the tightest lines. According to Medicare's coverage page, a diabetic lower-extremity wound qualifies only when all three of these are true:

  1. You have Type 1 or Type 2 diabetes, and the wound is a result of the diabetes.
  2. The wound is classified as Wagner grade III or higher. That's a clinical grading scale wound-care specialists use to rate a wound's depth and severity, and your care team is the one who assigns it.
  3. You've already tried and failed an adequate course of standard wound therapy.

That last one trips people up. Medicare wants to see that the usual wound care, the dressings, the offloading, the infection control, was genuinely tried first and didn't work. HBO isn't a first move. It's what you turn to after the standard approach has run its course. If your wound is newer or milder, your doctor may need to document a full course of conventional treatment before Medicare will approve the chamber.

None of this is something you have to grade yourself. Your wound-care team assigns the Wagner grade and documents the prior treatment. But knowing the three gates ahead of time tells you what your doctor's paperwork has to show.

What Hyperbaric Oxygen Therapy Costs Under Medicare

When your condition does qualify, HBO therapy is billed as a normal Part B outpatient service. That means you pay the standard Part B cost share: after you've met your annual Part B deductible ($283 in 2026), you generally owe 20% of the Medicare-approved amount for each session.,

That 20% adds up faster than it sounds. HBO isn't a one-and-done treatment; it's delivered as a course of repeated sessions, and your 20% coinsurance applies to every single one. So the per-visit share may feel small, but it stacks up across a full course. If you have a Medigap supplement policy, it may pick up that 20% for you. And if you're on a Medicare Advantage plan, your cost share and prior-authorization rules are set by your plan, so check with it directly before you start.

The smart move is to ask the treatment center for a written estimate of the total number of sessions and the per-session cost before you begin. Multiply it out. That's your real out-of-pocket picture, not the single-visit number.

What Hyperbaric Oxygen Therapy Medicare Won't Cover

This is the part worth being clear-eyed about. NCD 20.29 doesn't just list what's covered, it states that any indication not on that list is not covered by Medicare. So coverage isn't a gray area you can argue your way into; it's a closed list.

The rule specifically names some common conditions that fall outside it, including ordinary cutaneous (skin) ulcers, pressure sores, stasis ulcers from poor circulation, and thermal skin burns. HBO clinics sometimes market their chambers for a much wider range of uses, from sports recovery to long-COVID to a long list of off-label conditions. Those may or may not have merit, but if they're not on the NCD 20.29 list, Medicare treats them as non-covered, and you'd be paying the full price yourself.

If you're being pitched HBO for something that isn't a covered condition, ask the provider two direct questions: is my exact condition on Medicare's approved list, and if not, what will the whole course cost me out of pocket? A reputable center will give you a straight answer.

Frequently Asked Questions

Does Medicare cover hyperbaric oxygen therapy for a diabetic foot ulcer?

Sometimes, but not automatically. A diabetic foot ulcer isn't covered on its own; it has to be documented as a qualifying wound first (see The Diabetic Wound Rule above). If your wound doesn't meet the bar today, that can change: a wound that deepens, or one that fails a documented round of standard care, may qualify later even if it doesn't now.

How much will I pay out of pocket for HBO therapy?

For a covered condition, you pay the annual Part B deductible ($283 in 2026) and then 20% of the Medicare-approved amount for each session., Because a full course can run many sessions, that 20% adds up, so ask the center for a total estimate before you start.

Does Medicare Advantage cover hyperbaric oxygen therapy?

Medicare Advantage plans have to cover at least what Original Medicare covers, so a plan will cover HBO for the same NCD 20.29 conditions. But your out-of-pocket cost and any prior-authorization requirement are set by the plan, so confirm the details with your plan before treatment.

What conditions does Medicare not cover HBO therapy for?

Anything not named in NCD 20.29 is non-covered, and that "not covered" is total: Medicare pays nothing, so the full course cost falls on you. This is why an off-label pitch, whether it's for sports recovery, long-COVID, or a chronic condition that isn't on the list, matters financially. Ask the provider to confirm in writing whether your exact diagnosis is a covered indication before you agree to anything.

Why does my doctor say I need to try standard wound care first?

Because Medicare treats HBO as a step you reach only after conventional care has failed, not as a first option. In practice that means your record has to show an "adequate course" of the usual treatment, dressings, offloading, and infection control, was genuinely tried and didn't heal the wound. A single missed visit or a partial attempt generally won't satisfy the requirement, which is why your care team documents the full course.

Learn More

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The information on Brevy.com is for educational purposes only and is not a substitute for professional legal, financial, or medical advice. Rules vary by state and program and change frequently. Always verify with the relevant agency or a qualified professional. Brevy is not a law firm, financial advisor, or healthcare provider.

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Brevy Care Team

Expert eldercare guidance from Brevy's team of healthcare professionals and researchers.