Medicare covers portable oxygen equipment and supplies, but only when a doctor prescribes them for a medical reason and you meet specific conditions.

Medicare Part B pays for oxygen equipment, portable tanks, and related supplies if your doctor documents that you need them to treat a condition like COPD, heart disease, or severe anemia. The coverage includes the equipment itself, monthly refills, and maintenance — but Medicare will only pay for equipment rented or purchased from a supplier enrolled in the Medicare program.

The key requirement is a prescription and medical evidence. Your doctor must order the oxygen and note why you need it. Without that documentation, Medicare will not cover the cost, no matter how much the equipment costs or how much you want it.

Key Takeaways

  • Medicare Part B covers oxygen equipment and supplies when prescribed by a doctor for a medical condition, with you paying 20 percent of the approved amount after you meet your Part B deductible.
  • You must use a Medicare-enrolled supplier; equipment from other sources will not be covered, even if your doctor prescribes it.
  • Portable tanks, stationary concentrators, and related tubing and masks are all covered, but rental versus purchase rules vary by equipment type and length of need.
  • Your doctor's prescription must include the oxygen flow rate and the number of hours per day you need it, or Medicare will deny the claim.
  • If your oxygen needs change, you must get a new prescription; Medicare will not automatically increase your supply or equipment without updated medical documentation.

How Medicare decides what oxygen equipment it will pay for

Medicare uses a rule called "medical necessity" to decide whether to cover your oxygen. Your doctor must write a prescription that includes your diagnosis, the oxygen flow rate you need (measured in liters per minute), and how many hours per day you will use it. Medicare's contractors then review this information against their coverage guidelines for your specific condition.

If you have COPD, heart failure, or severe anemia, the bar is usually lower. If your condition is less common or your oxygen need is borderline, the contractor may request additional medical records — such as blood gas test results or pulmonary function tests — before approving coverage. This review can take one to two weeks.

Once Medicare approves the prescription, the supplier can deliver equipment. If Medicare later denies the claim, the supplier must tell you in writing and explain why. You then have the right to request a review of that decision.

Renting versus buying portable oxygen equipment

Medicare's rules differ depending on whether you rent or buy. For most portable oxygen equipment, Medicare will cover rental for up to 36 months. After 36 months of rental payments, the equipment becomes yours — the supplier transfers ownership to you, and Medicare stops paying rental fees.

If you want to buy equipment outright instead of renting, Medicare will cover the purchase price, but only if the equipment is deemed medically necessary and you use a Medicare-enrolled supplier. The purchase price is usually higher than 36 months of rental, so Medicare compares the two costs and may deny the purchase if renting would be cheaper.

Portable concentrators (battery-powered machines that pull oxygen from the air) are treated the same way: Medicare covers rental or purchase, but the supplier must be enrolled, and the equipment must be prescribed by your doctor.

What you pay out of pocket

After you meet your Part B deductible for the year, you pay 20 percent of the Medicare-approved amount for oxygen equipment and supplies. The remaining 80 percent is covered by Medicare. If you have a Medigap or Medicare Advantage plan, your out-of-pocket cost may be lower, depending on your plan's rules.

Monthly refills and replacement supplies — such as tubing, masks, or humidifier bottles — are also covered at 80 percent after your deductible. The supplier bills Medicare directly, and you receive a bill for your 20 percent share.

If you use a supplier who is not enrolled in Medicare, you will pay the full cost yourself. Medicare will not reimburse you later, even if your doctor prescribed the equipment. Always confirm that your supplier is Medicare-enrolled before accepting delivery.

How to start the process with your doctor and a supplier

Begin by talking to your doctor about whether you need supplemental oxygen. If your doctor agrees, they will write a prescription that includes your diagnosis, oxygen flow rate, and hours of daily use. Your doctor may also order blood gas tests or other tests to document your need.

Once you have the prescription, ask your doctor for a list of Medicare-enrolled suppliers in your area, or search the Medicare Supplier Directory online at Medicare.gov. Call at least two suppliers to compare equipment options, delivery times, and customer service — Medicare does not set prices, so costs can vary.

Give your chosen supplier a copy of your prescription. The supplier will submit the prescription and any supporting medical records to Medicare for review. During this review period, you should not receive equipment or be asked to pay. Once Medicare approves the claim, the supplier will contact you to arrange delivery and explain your out-of-pocket costs.

Portable oxygen and travel: what changes when you leave home

If you travel within the United States, Medicare covers portable oxygen equipment you already own or rent. However, you are responsible for arranging refills at your destination. Some suppliers have locations in multiple states and can refill your tank or exchange it for a full one; others do not.

Before you travel, contact your current supplier and ask whether they can refill or exchange equipment at your destination, or whether they can refer you to a Medicare-enrolled supplier near where you will be. If your supplier cannot help, search the Medicare Supplier Directory for enrolled suppliers in that area and call ahead to confirm they have your equipment type in stock.

If you travel outside the United States, Medicare will not cover oxygen equipment or refills. You will need to arrange and pay for oxygen through a private supplier or the healthcare system in that country. Plan ahead if international travel is part of your routine.

What to do if Medicare denies your oxygen claim

If Medicare denies coverage for your oxygen equipment, the supplier must send you a written notice called a "Notice of Non-Coverage" or "Explanation of Benefits" that explains the reason. Common reasons for denial include: the prescription did not include the oxygen flow rate, your doctor's documentation did not support medical necessity, or the supplier was not enrolled in Medicare.

You have the right to request a review of the denial. The process has multiple levels: first, you can ask the supplier to resubmit the claim with additional medical records; second, you can file a formal appeal with Medicare; and third, you can request an independent review. Each level has a time limit — usually 60 days from the date of the denial notice.

If you believe the denial is wrong, contact your doctor and ask them to provide additional documentation of your medical need. Your doctor's statement can be powerful in an appeal. You can also contact your State Health Insurance information Program (SHIP), which offers free help with Medicare appeals and disputes.

Frequently Asked Questions

Does Medicare cover oxygen if I only need it at night or during exercise?

Yes, if your doctor prescribes it for those specific times. Your prescription must state the hours per day and the circumstances when you need oxygen. Medicare will cover equipment and supplies for the hours and situations your doctor documents.

Can I use oxygen equipment from a non-Medicare supplier and have Medicare pay me back?

No. Medicare will not reimburse you for equipment purchased or rented from a supplier who is not enrolled in the Medicare program. Always confirm enrollment before accepting equipment or paying any amount.

What happens if my oxygen needs increase after Medicare approves my equipment?

You need a new prescription from your doctor that reflects the higher flow rate or longer hours of use. Your doctor must document the medical reason for the increase. Submit the new prescription to your supplier, who will resubmit it to Medicare for review.

Does Medicare cover portable oxygen concentrators?

Yes, portable concentrators are covered under the same rules as tanks and stationary equipment. Your doctor must prescribe them, you must use a Medicare-enrolled supplier, and you pay 20 percent of the approved cost after your deductible.

Will Medicare pay for a backup oxygen tank or concentrator?

Medicare typically covers one primary piece of equipment. A backup is usually not covered unless your doctor documents a medical reason — for example, if your equipment frequently malfunctions or if you have a condition that requires continuous oxygen and cannot tolerate any interruption. Ask your doctor whether a backup is medically necessary and have them document it in your prescription.