If you or someone you love struggles to breathe, one question matters more than almost any other: does Medicare cover oxygen therapy? The short answer is yes. Original Medicare (Part B) pays to rent home oxygen equipment as durable medical equipment (DME) when a doctor documents that your blood oxygen levels are low enough to qualify. But the way Medicare structures this benefit — a 36-month rental, a strict qualifying blood test, and a frustrating gap around portable concentrators — trips up thousands of seniors every year. This 2026 guide walks you through exactly how the oxygen benefit works, who qualifies, what it costs, and how to avoid the denials that leave people paying out of pocket.
Table of Contents
- Does Medicare Cover Oxygen Therapy?
- How the 36-Month Rental Rule Works
- Who Qualifies: The Blood Oxygen Test
- What You’ll Pay in 2026
- Portable Oxygen Concentrators: The Coverage Gap
- Original Medicare vs. Medicare Advantage
- How to Avoid Denials
- Frequently Asked Questions
Does Medicare Cover Oxygen Therapy?
Yes. Medicare Part B covers home oxygen therapy as durable medical equipment when your treating physician certifies that you have a qualifying condition, that your arterial blood gas (or pulse oximetry) reading falls within Medicare’s range, and that oxygen is reasonably expected to improve your condition. Coverage is governed by the long-standing National Coverage Determination (NCD 240.2, “Home Use of Oxygen”). The benefit covers the oxygen-generating equipment, the gas or liquid oxygen itself, tubing, cannulas, masks, humidifiers, and routine maintenance — all bundled into a single monthly rental payment.
What Medicare does not cover is oxygen prescribed only for comfort, for shortness of breath without a documented low oxygen level, or for conditions outside the approved list. This is the single most common reason claims are denied: the paperwork shows breathlessness but not a qualifying blood-oxygen number.
How the 36-Month Rental Rule Works
Unlike a wheelchair you might eventually own, home oxygen is a capped rental. Medicare pays your DME supplier a monthly rental fee for 36 months (three years). After month 36, the supplier must continue to provide the same equipment, oxygen contents, and servicing for an additional 24 months at no rental charge to you — a total equipment life cycle of five years.
What the monthly payment includes
The rental is “all-in.” You should never receive a separate bill for tubing, nasal cannulas, masks, or the oxygen contents themselves — those are bundled. During months 37 through 60, the supplier still bills Medicare separately for the oxygen contents if you use liquid or gaseous oxygen, but the equipment use itself is free to you.
The five-year reset
At the end of the 5-year reasonable useful lifetime, a new rental cycle can begin with new equipment if you still medically qualify. If you switch suppliers mid-cycle (for example, after a move), the 36-month clock generally does not restart — the new supplier picks up where the last one left off.
Who Qualifies: The Blood Oxygen Test
Qualification hinges on objective testing — an arterial blood gas (ABG) drawn from an artery, or a pulse oximetry (SpO2) reading. Crucially, the test must be performed by your treating physician or a certified lab, not by the oxygen supplier, and it must be done while you are on room air (breathing normally without supplemental oxygen). Medicare sorts qualifying patients into two groups.
| Group | Blood oxygen reading | Extra requirement |
|---|---|---|
| Group I (clear qualifier) | PaO2 at or below 55 mmHg, or SpO2 at or below 88% | None — at rest, during sleep, or during exercise |
| Group II (borderline) | PaO2 of 56–59 mmHg, or SpO2 of 89% | Plus signs of strain: cor pulmonale, P pulmonale on EKG, pedal edema, or hematocrit above 56% |
| Not covered | PaO2 of 60 mmHg or above, or SpO2 of 90%+ | Generally denied unless special documentation |
Group I patients are typically certified for 12 months (or the length of need, if shorter). Group II patients are usually recertified at 3 months, because borderline levels are more likely to change. Common qualifying diagnoses include COPD, pulmonary fibrosis, severe heart failure, and certain sleep-related oxygen desaturation. If your low reading occurs only during sleep, Medicare may cover nocturnal oxygen specifically.
What You’ll Pay in 2026
Once you qualify, oxygen falls under standard Part B cost-sharing. You first meet the annual Part B deductible, then pay 20% of the Medicare-approved monthly rental; Medicare pays the other 80%. A Medigap (Medicare Supplement) policy typically covers that 20% coinsurance and the deductible, leaving little or nothing out of pocket.
| 2026 cost component | Amount |
|---|---|
| Part B annual deductible | $283 |
| Your share after deductible | 20% of approved monthly rental |
| Medicare’s share | 80% of approved monthly rental |
| With Medigap Plan G/N | Often $0 after deductible |
| Required supplier type | Medicare-enrolled DME supplier that accepts assignment |
Always confirm your supplier “accepts assignment.” A non-participating supplier can charge more than the Medicare-approved amount, and you could be stuck with the difference.
Portable Oxygen Concentrators: The Coverage Gap
This is where reality and expectation collide. Medicare will cover portability — if you are mobile within your home and your doctor documents that need, the benefit is supposed to include a portable option. But Medicare reimburses oxygen at a single bundled monthly rate regardless of whether the supplier provides heavy tanks or a lightweight portable oxygen concentrator (POC). Because POCs are expensive and the reimbursement is the same, many suppliers default to refillable tanks and decline to provide a POC under the rental.
The result: many seniors who want a travel-friendly POC end up buying one out of pocket, often $2,000–$3,500. Before you pay cash, ask several Medicare suppliers directly whether they will supply a POC under your benefit, and get the answer in writing. A Medicare Advantage plan may offer a more generous equipment allowance, so it is worth comparing.
Original Medicare vs. Medicare Advantage
Medicare Advantage (Part C) plans must cover everything Original Medicare covers, including oxygen, but they manage it through networks and prior authorization. That can mean using a specific contracted supplier and getting approval before equipment is delivered. The trade-off: some MA plans bundle in extras or a broader equipment selection. If oxygen is a long-term need, check the plan’s DME supplier network and prior-authorization rules during open enrollment rather than after a crisis. For a primer on how the two paths differ, see our complete Medicare guide for 2026.
How to Avoid Denials
- Get the qualifying test on room air. A reading taken while you are already on oxygen will not establish need.
- Make sure the physician — not the supplier — orders and documents the test. Supplier-run tests are not accepted for the initial certification.
- Keep recertification dates. Group II patients especially must be retested around 3 months or coverage lapses.
- Use a Medicare-enrolled supplier that accepts assignment to avoid balance billing.
- If denied, appeal. Oxygen denials are frequently overturned when the blood-oxygen documentation is corrected and resubmitted.
This article is educational and not medical advice; see our medical disclaimer and always confirm coverage details with your physician and plan.
Frequently Asked Questions
Does Medicare pay for a portable oxygen concentrator?
Medicare’s benefit is supposed to include a portable option if you are mobile in your home, but it reimburses one flat monthly rate. Because POCs cost more than tanks, many suppliers won’t provide one under the rental, so seniors often buy POCs out of pocket. Ask suppliers in writing before paying cash.
How long does Medicare pay for home oxygen?
Medicare pays a monthly rental for 36 months. The supplier must then maintain and service the same equipment for another 24 months at no rental cost — a five-year cycle. If you still qualify after five years, a new cycle with new equipment can begin.
What oxygen level qualifies for Medicare coverage?
An SpO2 at or below 88%, or an arterial PaO2 at or below 55 mmHg, qualifies outright (Group I). Borderline readings of 89% SpO2 or 56–59 mmHg qualify only with added evidence such as cor pulmonale, edema, or a hematocrit above 56% (Group II).
Will Medigap cover my oxygen costs?
Yes. Most Medigap plans cover the 20% Part B coinsurance on DME, and several also cover the Part B deductible, so a qualifying senior with Medigap often pays little or nothing for home oxygen.
Related Articles You May Find Helpful
- Medicare Complete Guide 2026
- COPD in Seniors 2026: GOLD Guidelines & Treatment
- Does Medicare Cover CPAP & Sleep Apnea?
- Medicare Coverage for Walkers & Wheelchairs
- Does Medicare Cover Home Health Care?
Sources
- Centers for Medicare & Medicaid Services — NCD 240.2, Home Use of Oxygen; Medicare.gov, Oxygen Equipment & Accessories
- CMS — 2026 Medicare Parts A & B Premiums and Deductibles fact sheet
- Medicare Rights Center — Medicare Interactive, oxygen equipment guidance
