Medicare DME Coverage: What’s Reimbursable and What Isn’t

“Medicare covers durable medical equipment” is true and also not very useful on its own, because the coverage decision doesn’t hinge on the item — it hinges on documentation, timing, and which supplier fills the order. A crutch, a cane, and a power wheelchair can all sit in the same Medicare benefit category and still be approved or denied for completely different reasons. This guide walks through what Medicare Part B actually requires before it will pay for durable medical equipment (DME), what routinely trips people up, and where the real exclusions are — as distinct from the common misconceptions about what’s excluded.

Where to source this: Several of the DME categories covered below — crutches, canes, and ankle braces — are stocked by LAC, CASRAI’s sister medical-supply business. Browse LAC’s crutches category, ankle braces category, or canes & walking sticks category. Buying the item is the easy part; getting Medicare to pay for it depends on everything below.

What actually qualifies as DME under Medicare Part B

Medicare’s definition of durable medical equipment isn’t just “medical stuff a doctor recommended.” To be covered under Part B, an item generally has to meet all of the following:

• Durable — it can withstand repeated use rather than being consumed or discarded after one use.
• Used for a medical purpose — it’s used to treat an illness or injury, not general wellness.
• Not generally useful in the absence of illness or injury — this is the line that excludes a lot of things people assume are covered (more on that below).
• Appropriate for use in the home — Medicare’s DME benefit is built around home use; equipment that only makes sense in an institutional setting doesn’t fit the same pathway.
• Has an expected useful lifetime of at least several years, not a short-term consumable.

Crutches, canes, walkers, hospital beds, oxygen equipment, CPAP machines, and rigid or semi-rigid ankle braces are common examples that clear this bar. Items that are primarily for comfort, convenience, or general safety — rather than treatment of a specific documented condition — typically don’t, no matter how clinically sensible they sound.

The order and the medical necessity documentation Medicare requires

Since 2020, Medicare has required a Standard Written Order (SWO) for DMEPOS items before a supplier can submit a claim. The SWO has to include, at minimum: the beneficiary’s name, a description of the item (can be general, e.g. “wheelchair,” or specific, e.g. “power wheelchair, group 3”), the order date, the quantity, and the treating practitioner’s name, National Provider Identifier, and signature.

The order alone isn’t sufficient. The item also has to be supported by medical necessity documentation in the beneficiary’s medical record — notes from the treating practitioner that establish the specific clinical basis for that item, not just a diagnosis in the abstract. The DME Medicare Administrative Contractors (DME MACs) publish Local Coverage Determinations (LCDs) for individual item categories that spell out exactly what has to be documented — e.g., specific mobility limitations for a wheelchair, or a documented weight-bearing restriction for crutches. Suppliers and prescribers who don’t match the record to the specific LCD’s criteria are the most common source of denied claims, even when the underlying clinical need is real. If you’re new to how Medicare structures these determinations, CASRAI’s guide to NCDs vs. LCDs covers the distinction in more depth.

The face-to-face encounter and written-order-prior-to-delivery rule

For a specific subset of higher-cost items — power mobility devices (power wheelchairs and scooters) and other equipment CMS designates on its Specified Covered Items List — two additional requirements apply on top of the SWO:

• A face-to-face encounter between the beneficiary and the treating practitioner, documented in the medical record, within the 6 months before the order is written. A phone call or a note written from memory doesn’t satisfy this — it has to be a real, documented clinical encounter that addresses the condition the equipment is meant to treat.
• A written order prior to delivery (WOPD) — the supplier has to have the completed order in hand before delivering the item, not after. Delivering first and getting the paperwork later is a documented cause of claim denial even when everything else about the case is legitimate.

Most everyday mobility items — standard crutches, canes, and off-the-shelf ankle braces — fall outside this stricter list and only need the standard order plus medical necessity documentation. The face-to-face/WOPD rule exists specifically because Medicare has historically flagged higher-cost powered equipment as a disproportionate source of billing errors and fraud, so it applies extra friction there rather than uniformly across all DME.

Competitive bidding areas: why the same item isn’t reimbursable from every supplier

Medicare’s DMEPOS Competitive Bidding Program designates specific geographic areas — Competitive Bidding Areas (CBAs) — where, for certain equipment categories, Medicare will only pay a supplier that holds a Medicare competitive bidding contract for that area and category. If a beneficiary in a CBA buys or rents a competitively-bid item from a non-contract supplier, Medicare generally won’t pay any part of the claim, regardless of whether the medical necessity documentation is otherwise perfect. This is a genuinely common source of confusion: the equipment was medically necessary, correctly ordered, and correctly documented, and the claim still gets denied — because the supplier wasn’t a contract holder in that ZIP code.

There are limited exceptions (e.g., a beneficiary traveling outside their home CBA, or certain grandfathered rental arrangements that started before a CBA took effect), but they’re narrow. Which categories and areas are currently subject to competitive bidding changes between contract rounds, so the reliable move — for a clinic dispensing DME or an individual shopping for it — is to check Medicare’s current supplier directory for the beneficiary’s specific ZIP code and item category before ordering, rather than assuming last year’s rules still apply.

What Medicare actually pays, once an item is approved

For DME approved under Part B, Medicare typically pays 80% of the Medicare-approved amount once the beneficiary has met the Part B deductible for the year; the beneficiary is responsible for the remaining 20% coinsurance, unless a supplemental (Medigap) plan or Medicaid covers it. Whether the supplier accepts assignment matters directly here — a participating supplier that accepts assignment can’t charge more than the Medicare-approved amount, while a non-participating supplier can charge more and bill the beneficiary the difference. Some items are purchased outright; others (like oxygen equipment or hospital beds) are rented, often under a capped rental period after which ownership or continued coverage terms change. None of this is optional paperwork to skip past — it directly determines what a beneficiary or clinic ends up owing out of pocket even after “coverage” is approved.

What Medicare does not cover — the common misconceptions

A lot of DME denials trace back to a genuine misunderstanding of what counts as “medical equipment” under Medicare’s definition, not a paperwork failure. Items that are routinely assumed to be covered but generally are not include:

• Home modifications and structural aids — grab bars, wheelchair ramps, stairlifts, and bathtub modifications are typically treated as home modifications, not DME, and fall outside Part B regardless of how clearly they’d help a specific patient.
• Most exercise and fitness equipment — even when a physician recommends exercise for a documented condition, general exercise equipment usually fails the “not useful in the absence of illness or injury” test, since it’s equally useful to someone without the condition.
• Comfort and convenience items — equipment whose primary function is comfort rather than treatment of a specific condition, even if it makes a genuine difference to quality of life.
• Equipment intended for use outside the home as the primary setting, where the home-use criterion isn’t met.
• Backup or duplicate equipment in most circumstances — Medicare generally covers one functioning unit of a given item type, not a spare.

The pattern across all of these is the same: Medicare’s coverage test is about whether the item is durable, medical, and specifically tied to a documented condition — not whether it’s a reasonable, helpful thing to own.

Mobility aids as a worked example

Crutches, canes, walkers, and rigid or semi-rigid ankle braces are a useful case because they show the rule in practice without the added face-to-face/WOPD layer that applies to powered equipment. A pair of axillary crutches issued after a documented non-weight-bearing lower-limb injury, with a treating practitioner’s order and a chart note establishing the weight-bearing restriction, generally clears Part B’s DME criteria cleanly. The same crutches purchased by someone without a documented injury — for general home safety, say — don’t, because there’s no illness-or-injury basis in the record. CASRAI’s mobility aid buying guide covers the selection side of this in detail — which crutch type, cane, or ankle brace rigidity fits which clinical picture — while this guide covers whether Medicare will actually pay for it.

Frequently asked questions

Does Medicare require a specific diagnosis code to cover DME?

Medicare doesn’t require one single universal diagnosis code across all DME — coverage criteria are set per item category in the relevant LCD, and the diagnosis/documentation has to support that specific category’s criteria, not just any medical condition in general.

Can a clinic bill Medicare directly for DME it dispenses?

Only if the clinic is enrolled as a Medicare DMEPOS supplier with its own supplier number. A clinic that isn’t enrolled as a DME supplier generally can’t bill Medicare Part B for equipment it hands out, even if it’s otherwise a Medicare-enrolled provider for other services.

What happens if a supplier delivers equipment before getting the signed order?

For items subject to the written-order-prior-to-delivery rule, delivering before the order is signed is a documented basis for claim denial, independent of whether the equipment was medically necessary.

Does Medicare cover repairs and replacement parts for DME it originally covered?

Generally yes, for equipment a beneficiary owns, subject to its own documentation requirements (and different rules apply to rented equipment, where the supplier is typically responsible for repairs). Replacement of the entire item before the end of its reasonable useful lifetime requires its own medical necessity justification, not just wear and preference.

Related CASRAI guides

• Mobility Aid Buying Guide: Crutches, Canes, and Ankle Braces — selection criteria for the items covered as a worked example above.
• Medicare Coverage Determinations: NCD vs LCD Explained — how the coverage criteria referenced throughout this guide actually get set.
• Clinic Startup Equipment Checklist — for a new clinic planning to stock and dispense DME alongside its broader equipment list.
• Buying an AED for Your Facility — a separate equipment-compliance decision most clinics face around the same time as DME stocking decisions.

This guide summarizes Medicare Part B DME coverage mechanics as a starting reference. Specific coverage determinations depend on the current LCD for the item category and the beneficiary’s individual record — verify current requirements with the relevant DME MAC or a Medicare-enrolled supplier before relying on this for a billing decision.