Key takeaways
- A DME claim is paid when the order, the medical record, the proof of delivery and the claim all tell the same story.
- Code the item with the right HCPCS code and the modifiers its policy calls for, and bill rentals month by month.
- Check prior authorization and coverage rules before delivery, not after a denial.
- Most DME denials trace back to missing or mismatched documentation, so fix the file before you send the claim.
What DME billing involves
Durable medical equipment (DME) billing is the work of getting paid for items such as CPAP devices, oxygen equipment, wheelchairs, hospital beds, orthotics and diabetic supplies. It is different from physician billing. The supplier, not the doctor, submits the claim, items are coded with HCPCS codes, and many items are rented or resupplied over many months.
The steps below follow the order a claim actually moves in. They describe how Medicare works in general. Each item and each payer has its own policy, so always check the current coverage policy for the product you are billing.
The 8 steps to bill a DME claim
| Step | What to do | What goes wrong |
|---|---|---|
| 1. Verify the patient | Confirm coverage, the primary payer and any secondary, and whether the item needs prior authorization | Delivering before approval; wrong payer order |
| 2. Get a valid order | Written order from the treating practitioner with the elements the payer requires for the item | Missing elements, wrong item, order dated after delivery |
| 3. Confirm medical necessity | Medical records that support the need and meet the coverage criteria for the item | Thin notes, tests or visits missing from the record |
| 4. Deliver and document | Proof of delivery with the patient name, item, date and signature or delivery record | No signature, date that does not match the claim |
| 5. Code the claim | Right HCPCS code, modifiers, units, diagnosis and dates of service | Wrong modifier, wrong units, rental month errors |
| 6. Submit on time | Send within the payer’s filing limit; Medicare’s is one year from the date of service | Missing the deadline on slow or resubmitted claims |
| 7. Post and reconcile | Match payments and adjustments to each claim, and bill the patient or secondary for what remains | Short payments left unchallenged |
| 8. Work denials and track rentals | Appeal or correct denials, and bill each rental month and resupply on time | Denials aged out, months skipped |
The documents every DME claim needs
An auditor or reviewer asks for the same file again and again. Keep these together for every item you bill.
- The order. A written order from the treating practitioner. Some items require it before delivery, so know which ones.
- Supporting medical record. Notes that show why the patient needs the item and that meet the policy’s criteria.
- Proof of delivery. Who received what, and when, with a signature or a carrier delivery record.
- Authorization. For items that require prior authorization, the approval number and date.
- Special forms. Items that need an additional form or test result, such as a sleep study for a CPAP or qualifying test results for oxygen.
If any of these is missing or disagrees with another, expect a denial or a repayment request on audit.
Coding the claim: HCPCS codes and modifiers
DME is coded with HCPCS Level II codes, which begin with a letter (E for most equipment, K for certain items, L for orthotics and prosthetics, A for supplies). Pick the code that matches the item you actually delivered, not a similar one.
Modifiers tell the payer how the item was supplied and whether special rules apply. The most common are NU (new purchase), RR (rental), KH, KI and KJ (rental month groups), KX (policy requirements met), and GA, GY and GZ (coverage notices). See our DME modifiers guide for what each one means and when to use it.
Billing rentals and resupply
Many DME items are rented. For capped rental items Medicare pays a monthly rental amount for a set number of months, and the supplier must bill each month correctly with the right modifier. Oxygen equipment follows its own rental rules. Resupply items, such as CPAP masks and tubing, are billed when the patient is eligible and has requested or confirmed the need, not on autopilot.
Build a monthly rental tracker. A skipped month or a wrong modifier usually means money you do not get back.
Prior authorization and coverage checks
Some DME items need approval before delivery. Check the payer’s current list and the item’s coverage policy before you deliver, because a claim for an item that needed approval and did not get it is likely to be denied. Eligibility changes during a rental, so recheck it regularly.
The most common DME billing mistakes
- Documentation that does not match. The order, record and delivery disagree on item, date or patient.
- Late or incomplete orders. The order arrives after delivery or leaves out required elements.
- Wrong or missing modifiers. Especially on rentals and on items that need KX.
- Skipped rental months. No tracker, so months go unbilled.
- Billing before approval. Items that needed prior authorization.
- Unworked denials. No one owns follow-up, so claims age out.
When to hand DME billing to a specialist
If denials, slow payment or rental tracking are eating your time, a billing partner that works DME claims every day can take it over. Our DME billing services check documentation before claims go out, track rentals and resupply, and work denials until paid. Standard pricing is 2.8% to 5% of collections, shaped by your volume, payer mix and product lines. You can also ask for a free DME audit of a sample of your claims.
DME billing FAQ
How do you bill DME to Medicare?
You need a valid written order, medical records that support the need, proof of delivery, and a claim with the right HCPCS code, modifiers and units. Items that need prior authorization must be approved first, and rentals are billed month by month. Always check the current policy for the item.
What is the filing deadline for a Medicare DME claim?
Medicare generally requires a claim within one year of the date of service. Other payers set their own limits, so check each contract.
What documents do you need to bill DME?
The written order, medical records supporting need, proof of delivery, any required authorization, and any item-specific forms or test results.
What is the most common reason DME claims are denied?
Documentation that is missing, late or inconsistent, such as an order that does not match the delivery record. Wrong modifiers and billing without required authorization are also common.
Can I bill DME claims myself?
Yes, but many suppliers outsource because DME rules are item specific and rentals and resupply must be tracked closely. A specialist billing company can take on part or all of the work.