What makes durable medical equipment billing different
Durable medical equipment billing works under a different rulebook from physician billing. Claims use HCPCS Level II codes instead of CPT, they go to the DME Medicare Administrative Contractors rather than the Part B contractors, and payment depends on whether the item is purchased, rented under the capped-rental rules or classified for frequent servicing. A single missing modifier — most often KX — can deny an otherwise clean claim. Fastora's certified billing and coding professionals provide DME billing services for suppliers as part of our wider medical billing services.
DME suppliers also live under supplier standards, surety bond requirements, accreditation and competitive bidding areas that physician practices never touch. Billing and compliance are inseparable here: a claim that pays but lacks the order or the face-to-face documentation behind it is an audit liability, not a win.
HCPCS coding and modifiers in DME billing
| Code | Descriptor (summary) | Billing note |
|---|---|---|
| E0601 | Continuous airway pressure (CPAP) device | Capped rental; KX when criteria met |
| E0470 | Respiratory assist device, bi-level pressure | Coverage criteria and face-to-face required |
| E1390 | Oxygen concentrator | Separate oxygen payment rules apply |
| K0001 | Standard wheelchair | KX modifier when documentation is on file |
| E0260 | Hospital bed, semi-electric | Capped rental category |
| E0431 | Portable gaseous oxygen system | Contents and equipment billed under oxygen rules |
HCPCS codes describe the equipment, and modifiers describe the transaction. NU marks a new equipment purchase, RR marks rental, UE marks used equipment, and LT and RT mark the side where applicable. KX tells the DME MAC that the coverage criteria in the medical policy are met and the documentation is on file — without it, many claims deny automatically.
Modifiers GA and GZ relate to Advance Beneficiary Notices: GA means a signed ABN is on file and the claim may be billed to the patient if denied, while GZ means no ABN was obtained. Using GZ on a claim you expect to deny is effectively writing off the balance, so the ABN decision has to be made at dispense, not at billing.
Capped rental and payment categories
Many DME items fall under capped rental: the supplier bills monthly rental, and after thirteen months of continuous use the equipment is considered purchased. Inexpensive or routinely purchased items are paid as a purchase, while items requiring frequent and substantial servicing — such as ventilators — are paid as ongoing rental.
Oxygen has its own payment structure with monthly contents and equipment allowances. Breaking the rental chain — a gap in medical necessity documentation, a hospital stay or a supplier change — can restart or complicate the rental months, so we track rental histories by patient and item.
Orders, documentation and supplier enrollment
Every DME claim rests on three documents: a detailed written order from the treating clinician, a face-to-face examination within the required timeframe, and medical records supporting the coverage criteria in the applicable Local Coverage Determination. The order must include the item description, the diagnosis and the length of need.
DME suppliers enroll with Medicare through the National Supplier Clearinghouse, maintain accreditation and post a surety bond. Competitive bidding areas add contract requirements for certain product categories. The KX modifier is covered in our resource library — it tells the DME MAC that the coverage criteria in the medical policy are met and the documentation is on file.
Eligibility and prior authorization for equipment
We run eligibility and benefits checks before dispensing, confirming DME coverage, rental versus purchase benefits and whether the item needs prior authorization. Many commercial and Medicare Advantage plans authorize DME through separate utilization review vendors with their own forms and timelines.
Same or similar equipment already in the patient's home is a frequent denial: the payer's records show an item that should still be functional, and the claim needs documentation of why a replacement is medically necessary now.
Common DME billing denials and how we prevent them
| Denial | Typical cause | Prevention step |
|---|---|---|
| Missing KX modifier | Coverage criteria met but KX not billed | KX added only when the LCD criteria are documented |
| No detailed written order | Order missing item description, diagnosis or length of need | Order checklist completed before the claim is built |
| Same or similar denial | Payer records show existing equipment | Prior equipment history checked at intake |
| Capped rental break | Gap in rental history or medical necessity | Rental months tracked by patient and item |
| No ABN on file | Statutorily excluded or non-covered item billed without notice | ABN obtained at dispense for likely non-covered items |
Every claim passes our Advanced Pre-Submission Claim Review before submission. Denials that still occur are worked by our denial management team, which corrects and resubmits or appeals with the record, and open balances are followed up by payer and age.
Enrollment for DME suppliers
DME suppliers enroll with Medicare as suppliers rather than physicians, through the National Supplier Clearinghouse with accreditation and a surety bond. Ordering and referring clinicians must be enrolled too, or the claim denies regardless of the supplier's own enrollment.
Our credentialing and enrollment service tracks each file through a nine-stage process, from document collection and NPI setup to applications, follow-ups and final approval, for both supplier and clinician enrollment.
How Fastora supports DME billing
Fastora works inside your existing billing system under the user access you grant, with no software to install and no hidden setup fees. You get a dedicated account contact, transparent dashboards, monthly performance reporting and a monthly review call.
Fees are quoted after a free assessment. To see how your current claims hold up, start with a free billing assessment.
A DME billing company for supplies, prosthetics and orthotics
As a DME billing company, we handle DME medical billing end to end: rental vs purchase logic, documentation requirements before delivery, and the modifiers that payers actually enforce on supply claims. Prosthetics and orthotics billing services run alongside it — L-code claims, prior authorization for custom devices, and appeals when medical necessity is questioned. Prosthetics and orthotics medical billing follows the same documentation-first rule: without the physician order and detailed written order on file, the claim cannot pay, so our workflow confirms documentation before the claim is built rather than after the denial. Supporting services: eligibility verification, denial management, free medical billing audit.