If your doctor has told you that you need supplemental oxygen at home, the first question most people ask isn't about oxygen concentrators or liter flow rates — it's 'How much is this going to cost me?'
The good news: Medicare does cover home oxygen equipment for people who meet the medical criteria. The not-so-good news: the rules are specific, and if you don't understand them going in, you might end up with a surprise bill or get steered toward a supplier who doesn't accept Medicare assignment.
This guide walks you through exactly how Medicare Part B covers home oxygen in 2026 — what qualifies you, what equipment is covered, how the rental-to-ownership timeline works, and what you'll actually pay out of pocket.
What Home Oxygen Equipment Does Medicare Cover?
Medicare Part B covers home oxygen as durable medical equipment (DME), which means it falls under the same program as wheelchairs, CPAP machines, and hospital beds. Specifically, Part B covers:
- Stationary oxygen concentrators — the standard plug-in electric units that pull oxygen from room air. These are the most common type prescribed for home use.
- Portable oxygen concentrators (POCs) — battery-operated units that let you move around freely. Medicare covers these as a separate item, and coverage has expanded significantly in recent years.
- Liquid oxygen systems — a reservoir unit at home plus a smaller portable container you fill from it. Better oxygen delivery for some patients, but more complex.
- Oxygen contents and supplies — the tubing, cannulas, masks, and humidifier bottles that go with the equipment.
- High-flow oxygen — for patients who need more than the standard flow rate, Medicare covers higher-capacity equipment when medically documented.
What Medicare does not cover: oxygen for the use of a patient who isn't at home (like during air travel), or oxygen when it's prescribed for conditions that don't meet the blood oxygen threshold requirements.
Do You Qualify for Medicare Home Oxygen Coverage?
This is where a lot of people get tripped up. Medicare doesn't cover home oxygen simply because your doctor writes a prescription — you have to meet specific clinical criteria.
The primary threshold: Your blood oxygen level must be at or below 88% oxygen saturation (measured by pulse oximetry) or your arterial blood gas PaO2 must be at or below 55 mmHg at rest.
If your oxygen level is between 89%–90%, you can still qualify if you have a condition like pulmonary hypertension, cor pulmonale, or erythrocythemia, and your doctor documents it properly.
Common conditions that lead to qualification:
- Chronic obstructive pulmonary disease (COPD) — emphysema, chronic bronchitis
- Congestive heart failure with a pulmonary component
- Interstitial lung disease
- Lung cancer (depending on severity)
- Severe asthma with chronic hypoxia
- Post-COVID pulmonary complications
What your doctor needs to document:
Your physician must complete a Certificate of Medical Necessity (CMN) — a specific Medicare form (CMS-484) that records your diagnosis, your blood oxygen levels (measured during specific conditions), and the prescribed liter flow rate. The CMN must be completed and signed before the supplier can bill Medicare.
One thing worth knowing: blood oxygen levels can be higher during rest and drop during exercise or sleep. If you're borderline at rest, ask your doctor about testing under these conditions — Medicare allows qualification based on exercise-induced or sleep-related hypoxia as well.
How the Medicare Home Oxygen Rental Process Works
Home oxygen under Medicare operates on a 36-month rental cycle, and understanding this timeline can save you a lot of confusion.
Months 1–36: Medicare pays the supplier a monthly rental fee for your oxygen equipment. Your cost is 20% of the Medicare-approved amount (after your Part B deductible is met). The supplier owns the equipment during this period and is responsible for maintenance, repairs, and replacements.
After month 36 (the "cap"): Medicare stops paying the monthly rental. The equipment technically "passes" to the supplier's ownership permanently — but here's the important part: your oxygen supply doesn't stop. The supplier is required by law to continue providing you with oxygen contents, tubing, and servicing for an additional 24 months (through month 60) at no additional cost beyond your 20% coinsurance for supplies.
After month 60: At this point, Medicare reassesses. If you still need oxygen, the cycle can begin again.
Portable oxygen concentrators have a slightly different rule: Medicare purchased POCs outright (rather than renting them) starting in 2016. Your 20% coinsurance applies to the purchase price.
Key rule: You must use a Medicare-enrolled DME supplier for all of this to work. If you use a non-enrolled supplier, Medicare won't pay any portion of the bill. You can search for enrolled oxygen suppliers in your area using DMEHelper's directory — it shows which providers accept Medicare assignment, which means they're prohibited from charging you more than the Medicare-approved rate.
Find Medicare-enrolled oxygen equipment suppliers near you →
What You'll Pay for Home Oxygen Equipment in 2026
Here's a realistic look at your out-of-pocket costs:
| Cost Item | 2026 Amount |
|---|---|
| Part B annual deductible | $285 (must be met first) |
| Your share of monthly rental | 20% of Medicare-approved rate |
| Your share of supplies (tubing, cannulas) | 20% of Medicare-approved rate |
| If you have Medigap/supplemental insurance | Often covers your 20% |
The Medicare-approved rental rate for an oxygen concentrator varies by region but typically runs $100–$200/month total, meaning your 20% is roughly $20–$40/month after the deductible.
If you have a Medicare Advantage plan (Part C), your costs may be different — check your plan's DME benefit, as some plans have different cost-sharing rules or require specific in-network suppliers.
If you can't afford the 20%: Check whether you qualify for Medicaid, which may cover the copay. Many states have programs specifically for low-income Medicare beneficiaries (called Medicare Savings Programs) that pay Part B cost-sharing.
Choosing a Medicare-Enrolled Oxygen Supplier: What to Ask
Not all oxygen suppliers are the same, even if they're all Medicare-enrolled. Here's what to evaluate before you commit:
Do they accept assignment? Suppliers who "accept assignment" agree to take the Medicare-approved rate as full payment. Those who don't can charge you more. Always confirm this upfront.
What's their response time for equipment issues? Oxygen equipment failures aren't minor inconveniences — they're medical emergencies. Ask specifically: "If my concentrator stops working at 2am on a Saturday, what happens?" You want a 24/7 answer, not a voicemail.
Do they offer portable oxygen as well? If you're still active, ask about portable concentrator options alongside your stationary unit. Some suppliers coordinate both; others only carry stationary equipment.
How do they handle the CMN process? A good supplier will coordinate directly with your doctor's office to get the Certificate of Medical Necessity completed. If they're putting all that paperwork back on you, that's a red flag.
Are they local or a national mail-order supplier? Both have trade-offs. Local suppliers can often respond faster for equipment issues; national suppliers may have better selection or pricing. For oxygen specifically, many patients prefer local given the emergency potential.
Compare Medicare oxygen suppliers in your area →
Frequently Asked Questions About Medicare and Home Oxygen
Q: Does Medicare cover portable oxygen concentrators?
Yes. Medicare Part B covers portable oxygen concentrators as a purchase (not rental). You pay 20% of the Medicare-approved purchase price after your Part B deductible. Your doctor must document medical necessity for portability specifically.
Q: What if my blood oxygen is 89% — do I still qualify?
It depends. At 89%, you don't automatically qualify based on that number alone. However, if you have a documented condition like pulmonary hypertension or cor pulmonale, your doctor may still be able to certify you. Ask your physician to review the CMN criteria for these secondary conditions.
Q: Can Medicare cover oxygen for exercise or sleep only?
Yes. Medicare allows qualification based on blood oxygen levels measured during exercise (below 88%) or during sleep (below 88% for at least 5 minutes). If you only desaturate during activity or at night, ask your doctor about targeted testing.
Q: Does Medicare cover oxygen for COPD?
Yes, if your blood oxygen meets the threshold (88% or below). COPD is one of the most common qualifying conditions. Your pulmonologist or primary care physician will order a blood gas test or pulse oximetry reading to document your levels.
Q: What happens after 36 months of Medicare-paid oxygen rental?
Medicare stops paying the monthly rental after 36 months. However, your supplier is legally required to continue providing oxygen contents, tubing, and maintenance through month 60 at no extra charge beyond your normal coinsurance. You don't lose your oxygen — the payment structure just changes.
Q: Do I need to get a new prescription every year?
Medicare requires your doctor to recertify your need for oxygen periodically. Most oxygen orders require a follow-up visit within 90 days of starting therapy and then annually. Your supplier should track this and remind you, but confirm their process upfront.
Finding the right Medicare-enrolled oxygen supplier matters. Use DMEHelper to search providers in your area, filter by Medicare acceptance, and compare your options before committing.