Specialty billing
Durable Medical Equipment Medical Billing Services
DME billing is documentation-driven to an unusual degree: the claim depends on records created by the ordering physician rather than the supplier. A standard written order, a face-to-face encounter within the required window, and proof of delivery must all exist before the claim is submitted.
Durable Medical Equipment benchmarks
- Typical denial rate
- 16–24%
- Days in AR
- 45–60
- Achievable clean claim rate
- 95%+
Typical ranges for DME suppliers. Your actual numbers are measured during the audit.
The complexity
Why durable medical equipment is uniquely difficult to bill
A standard written order must be complete and dated before delivery
Many items require a documented face-to-face encounter within a defined window
KX, GA, GY and GZ modifiers signal coverage status and are frequently misapplied
Rental versus purchase determination affects the entire billing sequence
Capped rental items follow strict month-count sequences
Proof of delivery is required and is a primary audit target
Coding
Durable Medical Equipment procedure codes we work with daily
A representative sample, not an exhaustive list. Coders are assigned by specialty rather than pooled.
| Code | Description |
|---|---|
| E0601 | Continuous positive airway pressure device |
| K0001 | Standard wheelchair |
| E0143 | Walker, folding, wheeled, adjustable or fixed height |
| E1390 | Oxygen concentrator, single delivery port |
| A7030 | Full face mask used with positive airway pressure device |
| E0470 | Respiratory assist device, bi-level pressure capability |
Revenue leakage
Where durable medical equipment practices lose money
These are the denial patterns specific to this specialty — the ones a general-purpose billing service will not be looking for.
Incomplete written order
Orders missing required elements, the ordering physician's NPI, or a date preceding delivery.
Face-to-face requirements
Items denied because the required encounter did not occur within the permitted window or was not documented.
Modifier misuse
KX applied without meeting the coverage criteria it attests to, or GA omitted where an advance beneficiary notice was obtained.
Proof of delivery missing
Claims recouped on audit because delivery documentation with the beneficiary signature could not be produced.
Capped rental sequence errors
Rental months miscounted or continued past the capped rental period.
Payer landscape
What DME suppliers need to know about payers
Payer policy drives more durable medical equipment denials than coding does. Knowing the policy before the service is what prevents them.
- DME claims rest on physician-created documentation the supplier does not control — obtaining it before delivery is the only reliable control.
- The KX modifier attests that coverage criteria are met and documentation is on file; applying it without that documentation is an audit exposure, not just a denial risk.
- Proof of delivery is a primary target in DME audits and must be retained for the full record retention period.
Questions
Durable Medical Equipment billing FAQ
Last updated August 20, 2026
Reviewed by a certified coding leadBecause the claim depends on documentation created by someone else. The ordering physician produces the written order and the face-to-face encounter note, and the supplier bears the denial when either is incomplete. Obtaining and verifying that documentation before delivery — rather than after a denial — is the entire discipline of DME billing.
KX attests that coverage criteria are met and supporting documentation is on file. GA indicates an advance beneficiary notice was issued for a service expected to be denied. GY indicates an item statutorily excluded from coverage. GZ indicates an expected denial where no notice was issued. Applying KX without the underlying documentation is an audit exposure rather than merely a denial risk.
Certain items rent for a defined number of months, after which ownership transfers to the beneficiary and billing stops. Rental months must be tracked per beneficiary per item, including months billed by a prior supplier if the patient transferred. Miscounting produces denials and, where overpaid, recoupment.
Documentation identifying the beneficiary, the specific item delivered including quantity and item numbers, the delivery date, and the beneficiary's or designee's signature. It is among the first things requested in a DME audit, and its absence invalidates an otherwise correct claim.
Primary sources
Coverage, rates and local policy for durable medical equipment, at the source.
- DMEPOS supplier standards and enrollment (opens in a new tab)
Centers for Medicare & Medicaid Services — Supplier enrollment requirements and documentation standards for durable medical equipment, prosthetics, orthotics and supplies.
- Medicare Coverage Database (LCD/NCD) (opens in a new tab)
Centers for Medicare & Medicaid Services — Searchable national and local coverage determinations. The direct answer to whether a diagnosis supports medical necessity for a given procedure.
- HCPCS Level II code set (opens in a new tab)
Centers for Medicare & Medicaid Services — Codes for supplies, drugs, DME and services outside CPT — and the modifier definitions that go with them.
Reading
Durable Medical Equipment billing, in depth
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