Durable Medical Equipment: Wheelchairs, CPAP Machines, and What Plans Cover

What Counts as Durable Medical Equipment?

Durable medical equipment — almost always referred to by its acronym, DME — is a specific category of medical supply that most health insurance plans treat differently from doctor visits or prescription drugs. Getting clear on what qualifies as DME is the first step, because the definition determines which coverage rules apply.

Under Medicare's well-established standard (which most private insurers have adopted as a working baseline), a product must meet all four of the following criteria to qualify as DME:

1. Durable — It can withstand repeated use over time (not single-use or disposable).
2. Medical purpose — It primarily serves a medical function, not a comfort or convenience function.
3. Used in the home — It is appropriate for use in a home setting (not only in a clinical environment).
4. Medically necessary — A physician has determined it is necessary to treat or manage a diagnosed condition.

Notice what is not in that list: price, complexity, or whether a device requires a prescription. A basic wheeled walker and a sophisticated power wheelchair both qualify as DME. A hospital bed a patient uses at home also qualifies. Meanwhile, a fitness tracker — even one that monitors heart rate — generally does not, because its primary purpose is wellness, not medical treatment.

Common examples of items that typically meet the DME definition include:

• Manual and power wheelchairs
• CPAP and BiPAP machines and related supplies
• Oxygen equipment and portable oxygen concentrators
• Hospital beds (for home use)
• Walkers, crutches, and canes
• Blood glucose monitors and lancets (for diagnosed diabetics)
• Infusion pumps
• Nebulizers
• Traction equipment

Items that frequently fail the DME test — and therefore fall outside standard DME coverage — include air purifiers, shower chairs (in most plans), ergonomic furniture, and over-the-counter heating pads. Some of these may be covered under other plan provisions, or may qualify with additional documentation, but they don't start from a covered baseline.

How Medical Necessity Is Established — and Why It's the Critical Hurdle

Owning a device is not the same as being covered for it. The most common reason DME claims are denied is not that the item is excluded from the plan — it's that the claim lacks adequate documentation of medical necessity. Understanding how insurers evaluate medical necessity can help you avoid the most preventable denials.

Medical necessity for DME almost always requires a written order from a treating physician (sometimes called a prescription or a Certificate of Medical Necessity, or CMN). That document typically needs to include:

• The patient's diagnosis (using an ICD-10 code)
• Why the equipment is required to treat or manage that diagnosis
• How long the equipment is expected to be needed
• The prescribing physician's signature, NPI number, and date

For higher-cost items — power wheelchairs, home oxygen systems, CPAP machines — insurers routinely require more than a physician order. They may require:

1. A face-to-face clinical evaluation with written findings documented in the medical record
2. A functional assessment showing that the patient cannot perform specific mobility tasks (for power wheelchairs, this is often a formal mobility evaluation by a physical or occupational therapist)
3. A sleep study (polysomnography or home sleep test) showing AHI scores that meet coverage thresholds (for CPAP)
4. Prior authorization from the insurer before the equipment is dispensed

A practical point many patients miss: the face-to-face requirement is not a telehealth visit in most plans. It typically requires an in-person examination. If you skip this step and receive equipment first, your claim is likely to be denied on procedural grounds even if the medical need is genuine.

Also important: medical necessity is evaluated against the plan's Local or National Coverage Determination (LCD/NCD) in Medicare, or the insurer's own coverage policy in private insurance. These policies set specific clinical criteria — AHI thresholds for CPAP, functional limitation criteria for power wheelchairs — that the documentation must address. If your physician's notes don't use the same language or address the same criteria, prior authorization is likely to be denied even with a valid diagnosis.

If you manage a chronic condition, see our guide to chronic condition coverage for a broader picture of what ongoing care typically includes beyond DME.

Coverage by Plan Type: Medicare, Medicaid, and Private Insurance

DME coverage rules are not uniform. The type of plan you have — Medicare, Medicaid, an employer-sponsored plan, or a marketplace plan — determines both what is covered and how cost-sharing works.

Medicare Part B

Most DME for Medicare beneficiaries is covered under Part B (medical insurance), not Part A or a drug plan. Medicare Part B covers 80% of the Medicare-approved amount for covered DME after you meet your annual Part B deductible. You pay the remaining 20%, and that 20% has no cap unless you have supplemental (Medigap) coverage.

Medicare requires you to use a Medicare-enrolled supplier — your neighbor who sells used medical equipment does not qualify, even if the item itself would be covered. For a full breakdown of what each Medicare part covers, see Medicare Parts A, B, C, and D explained.

Medicare also has a competitive bidding program in most metro areas that affects which suppliers you can use and what the approved amounts are. Using a non-contract supplier in a competitive bidding area can result in significantly higher out-of-pocket costs or outright non-coverage.

Medicare Advantage (Part C)

Medicare Advantage plans must cover at least what Original Medicare covers — including DME — but they can and do add prior authorization requirements, network restrictions on suppliers, and different cost-sharing structures. Some plans include enhanced DME benefits; others have tighter documentation requirements. If you're on a Medicare Advantage plan, don't assume the same rules apply as Original Medicare. Check your plan's Evidence of Coverage document and, when in doubt, call member services before ordering equipment. Our annual Medicare review checklist can help you evaluate whether your current plan still meets your equipment needs.

Medicaid

Medicaid covers DME in all states, but the specific items covered, the prior authorization process, and the supplier network vary dramatically by state. Some states operate fee-for-service Medicaid where the state sets coverage rules directly; others use managed care organizations (MCOs) that set their own DME policies within state-established minimums. In general, Medicaid DME coverage is narrower than Medicare's, and many states require the equipment to be the lowest-cost option that meets clinical needs — meaning a power wheelchair may be denied if a manual chair would functionally suffice.

Employer-Sponsored and Marketplace Plans

Under the Affordable Care Act, marketplace plans must cover the ten essential health benefits, and DME is generally considered part of the rehabilitative and habilitative services and devices category. However, the specific items covered, the dollar caps, and the prior authorization requirements vary widely by plan. Employer-sponsored plans — especially self-funded plans — have more flexibility and may cover more or less than a marketplace plan. Always check your Summary of Benefits and Coverage (SBC) and the full plan document for DME-specific exclusions.

If your plan uses a high-deductible structure, keep in mind that DME costs accumulate toward your deductible. A health savings account (HSA) can be used tax-free to pay for qualified DME expenses, which can meaningfully reduce the out-of-pocket burden for high-cost equipment.

Wheelchairs, CPAP Machines, and Oxygen: A Closer Look at the Three Most Common DME Categories

Wheelchairs and Mobility Equipment

Wheelchairs are covered by virtually every insurance type, but the coverage criteria differ significantly between manual wheelchairs and power wheelchairs (power-operated vehicles, or POVs).

For a manual wheelchair, documentation requirements are generally straightforward: a physician order stating the diagnosis and functional need, combined with evidence that the patient cannot walk safely. Coverage is usually approved relatively quickly.

For a power wheelchair, the bar is considerably higher. Most plans — including Medicare — require that the patient be unable to self-propel a manual chair due to upper extremity limitations and that the power wheelchair is needed for mobility within the home (not just for outdoor or community use). The in-home mobility standard trips up many applicants: if you can walk with assistance to your bathroom and kitchen, Medicare may deny a power wheelchair even if you cannot walk distances outside. The evaluation must document your mobility limitations in the home setting specifically.

Power wheelchairs also typically require:

• A face-to-face examination within 45 days prior to the order
• A physical or occupational therapist's written evaluation
• Prior authorization in most plans
• Purchase from an accredited supplier

CPAP and BiPAP Machines

Continuous Positive Airway Pressure (CPAP) machines are among the most commonly covered DME items — and among the most frequently denied due to documentation gaps. Coverage requires a diagnosis of obstructive sleep apnea (OSA) confirmed by a sleep study showing an Apnea-Hypopnea Index (AHI) that meets your plan's threshold (Medicare requires AHI ≥ 5 with symptoms, or AHI ≥ 15 regardless of symptoms).

Even after initial approval, most plans — including Medicare — impose a compliance trial period of 90 days. During that period, the CPAP machine is typically rented, not purchased. To continue coverage beyond the trial, you must demonstrate compliance: using the machine for at least 4 hours per night on 70% of nights during a consecutive 30-day period within the first 90 days. Modern CPAP machines transmit compliance data wirelessly; your supplier will pull this data to submit to the insurer. If you don't meet the compliance threshold, coverage stops and you may be responsible for the full rental cost going forward.

Supplies — masks, tubing, filters, cushions — are covered separately, usually on a replacement schedule. Most plans allow new mask cushions every month and a full mask replacement every three to six months. Ordering outside the allowed schedule requires documentation of medical necessity (e.g., equipment damage or fit changes after significant weight change).

Home Oxygen Equipment

Home oxygen is covered when a patient has a qualifying diagnosis (most commonly COPD, pulmonary fibrosis, or heart failure) and meets blood oxygen saturation criteria documented in a physician's order. Medicare requires oxygen saturation at or below 88% at rest, or documentation of qualifying desaturation during sleep or exercise.

Like CPAP, home oxygen is typically provided as a rental under Medicare (up to 36 months, after which the equipment is generally owned by the patient but the supplier continues to provide maintenance and supplies). Private insurers handle oxygen rental and purchase differently, so review your plan documents carefully.

Note that the type of oxygen system prescribed matters for coverage. A stationary oxygen concentrator, a portable concentrator, liquid oxygen, or compressed gas tanks each have different coverage pathways. Your supplier should advise on which system your plan will authorize based on your documented oxygen needs and activity level.

When Claims Are Denied: Your Options and How to Appeal

DME denials are common — but they are also frequently overturned on appeal. Understanding why denials happen and how to respond can make a significant financial difference, especially for high-cost equipment.

The Most Common Denial Reasons

• Missing or incomplete documentation — The physician's order doesn't include required elements, or the medical record doesn't support the criteria in the coverage policy.
• Non-covered item — The equipment is categorically excluded by the plan (e.g., comfort items, items not meeting the DME definition).
• Non-enrolled or non-network supplier — Equipment was obtained from a supplier not enrolled in Medicare or outside your plan's network.
• No prior authorization — The claim was submitted for an item that required prior auth, and none was obtained in advance.
• Compliance failure — For CPAP, the compliance data did not meet the threshold.
• Frequency limitation — Replacement supplies ordered before the plan's allowed replacement schedule.

The Appeals Process

Every insurer and government program has a formal appeals process. For Medicare, there are five levels of appeal: redetermination (by the Medicare contractor), reconsideration (by a Qualified Independent Contractor), hearing before an Administrative Law Judge, Medicare Appeals Council review, and federal district court. Most successful appeals are won at the first or second level with improved documentation.

For private insurance, you have the right to both an internal appeal and, if that fails, an external review by an independent organization — guaranteed by the ACA for most plans. External reviews are decided by reviewers with no financial stake in the outcome, and their decisions are binding on the insurer.

Practical steps when filing an appeal:

1. Request a copy of the plan's coverage policy for the specific item — compare it line by line with your documentation.
2. Ask your physician to write a detailed letter of medical necessity that specifically addresses each criterion in the coverage policy.
3. Obtain supporting documentation from other treating providers (therapists, specialists).
4. Meet all appeal deadlines — missing a deadline can permanently foreclose a level of appeal.
5. Consider contacting your state's insurance commissioner or a patient advocate if internal processes stall.

If your condition requires specialized equipment while traveling, be aware that coverage outside your service area has its own complications. See our article on medical travel insurance for chronic conditions for guidance on keeping equipment coverage intact away from home.

Finally, some plans offer riders or supplemental benefits that expand DME coverage beyond the base plan. See our overview of health insurance riders worth knowing about to understand whether adding a rider could fill gaps in your current DME coverage.