Getting portable oxygen starts with a prescription from your doctor, based on a test showing your blood oxygen levels fall below a specific threshold. You cannot buy or rent medical-grade portable oxygen without one. The process involves a medical evaluation, a prescription, choosing a supplier, and understanding how insurance covers the cost. Here’s how each step works.
Qualifying for a Prescription
Your doctor will measure your blood oxygen levels using either a simple finger clip (pulse oximeter) or a blood draw from an artery. Medicare and most private insurers use the same cutoffs to determine eligibility. If your oxygen saturation is 88% or below at rest, during sleep, or during exercise, you qualify. The same applies if a blood gas test shows your arterial oxygen pressure at or below 55 mm Hg.
There’s a second tier of eligibility for people whose levels aren’t quite that low. If your saturation is 89% or your arterial oxygen pressure falls between 56 and 59 mm Hg, you can still qualify if you also have signs of heart strain, pulmonary hypertension, or an abnormally high red blood cell count. These conditions signal that your body is already compensating for low oxygen in ways that can cause further damage.
The testing can happen at rest in a clinic, during a walk or treadmill test, or overnight with a sleep study. Some people have normal oxygen while sitting still but drop significantly when moving around or sleeping. If your doctor suspects that pattern, they’ll order the appropriate test. The results determine not just whether you get oxygen but how many hours a day you need it and at what flow rate.
From Prescription to Equipment
Once your doctor writes the prescription, also called a Certificate of Medical Necessity, a durable medical equipment (DME) supplier handles the rest. In many cases your doctor’s office contacts the supplier directly, verifies your insurance coverage, and schedules delivery. If you’re being discharged from a hospital, your care team typically arranges everything before you leave. Delivery can take up to 24 hours.
When the supplier delivers your equipment, they walk you through setup, explain how to adjust the flow rate, show you how to charge batteries, and answer questions. You don’t need to figure anything out on your own. The supplier is also responsible for ongoing maintenance and replacing accessories like tubing and filters for the duration of your agreement.
If your doctor doesn’t have a preferred supplier, you can choose your own. Medicare publishes a list of approved DME suppliers, and your private insurer will have an in-network directory. Choosing an in-network supplier matters: going out of network can double or triple your out-of-pocket costs.
Types of Portable Oxygen Devices
Portable oxygen comes in two main forms: small compressed gas tanks and portable oxygen concentrators (POCs). Tanks hold a fixed supply of oxygen that runs out and needs refilling or replacing. They’re heavier and less convenient for daily use but don’t require electricity or charging.
Portable oxygen concentrators are battery-powered devices that pull oxygen from the surrounding air, concentrate it, and deliver it through a nasal cannula. They weigh between 3 and 10 pounds depending on the model, recharge from a wall outlet or car adapter, and don’t need refills. For most people who need oxygen on the go, a POC is the more practical choice.
POCs deliver oxygen in two ways: pulse dose and continuous flow. Pulse dose devices sense when you inhale and release a small burst of oxygen with each breath. Continuous flow delivers a steady stream regardless of your breathing pattern. Your prescription specifies which type you need. Pulse dose units tend to be smaller and lighter, but they aren’t appropriate for everyone, particularly during sleep.
What It Costs and How Insurance Helps
Medicare Part B covers portable oxygen equipment after you meet your annual deductible. You pay 20% of the Medicare-approved amount, and Medicare covers the rest. The arrangement works as a 36-month rental: your supplier provides and maintains the equipment for three years, then continues to supply accessories and service for an additional two years at no extra charge to you. That’s a full five-year obligation. If you still need oxygen after five years, a new rental cycle begins with the same or a different supplier.
Private insurance plans vary but generally follow a similar model, covering oxygen equipment as durable medical equipment with a copay or coinsurance. Check whether your plan requires prior authorization, because some do, and a missing authorization can result in a denied claim even with a valid prescription.
If you’re paying out of pocket or want a backup device insurance won’t cover, expect to spend between roughly $1,900 and $3,100 to purchase a portable concentrator outright, depending on the model and features. Rental plans through private suppliers typically run $99 to $450 per month, sometimes with a one-time setup fee. For short-term needs like a vacation or recovery from surgery, renting makes more financial sense. For long-term daily use, purchasing can save money over time, though the upfront cost is significant.
Flying With Portable Oxygen
Airlines do not allow compressed oxygen tanks on board, but FAA-approved portable oxygen concentrators are permitted on all U.S. commercial flights. Your device must carry a red label stating that the manufacturer has confirmed it meets FAA acceptance criteria. Most major-brand POCs already have this label, but check yours before booking a flight.
Airlines generally require you to notify them at least 48 hours before departure and bring enough charged batteries to power the device for the full flight plus a buffer, often 150% of the expected flight time. That means a four-hour flight may require six hours of battery life. Carry extra batteries in your cabin bag, since checked luggage isn’t accessible during the flight. Each airline has its own specific policies, so call ahead to confirm what paperwork they need, which often includes a copy of your prescription or a physician’s statement.
Safety at Home and on the Go
Oxygen itself doesn’t explode, but it makes everything around it burn faster and more intensely. The U.S. Fire Administration recommends keeping oxygen equipment at least 5 feet from any heat source, open flame, or electrical device. That includes stoves, candles, space heaters, and even hair dryers. Never smoke or allow anyone to smoke near oxygen equipment. Smoking while using supplemental oxygen is the leading cause of home oxygen fires.
Store tanks upright and secured so they can’t fall over. Keep your concentrator in a well-ventilated area, not enclosed in a closet or pressed against a wall, because it needs airflow to function properly and stay cool. When traveling by car, secure the device so it won’t slide or tip during sudden stops, and never leave it in a hot car for extended periods.
Maintaining Your Equipment
Portable concentrators have an air intake filter that should be inspected and cleaned one to two times per week. Most filters simply rinse under water and air dry before being reinserted. Your supplier will show you how during setup, and the device manual has model-specific instructions. A clogged filter forces the machine to work harder, reducing both performance and battery life.
Nasal cannulas and tubing are generally single-use items designed to be replaced regularly. Most suppliers ship replacement cannulas on a set schedule, typically every two weeks to once a month. If your tubing becomes discolored, stiff, or cracked, replace it immediately rather than waiting for the next shipment. During your rental period, your supplier is obligated to provide these consumables as part of the agreement.