The obvious cost is the denied claim itself. The real cost is everything that happens after it.
Start with the baseline. CMS’s Comprehensive Error Rate Testing program put the FY2025 improper payment rate for durable medical equipment, prosthetics, orthotics, and supplies at 24.12% ($2.27 billion) against an overall Medicare fee-for-service rate of 6.55%. DMEPOS is the highest-error claim type CMS measures, by a wide margin. Part B sits at 8.44%. Hospital inpatient sits at 3.15%.
And these aren’t fraud findings. Across Medicare FFS in the 2025 reporting period, roughly 53% of improper payments were attributed to insufficient documentation, 15.3% to medical necessity, and 12% to no documentation at all. The errors are administrative. Missing orders, unsigned records, documentation that doesn’t substantiate what was billed.
A denial doesn’t just delay payment — it triggers labor. Someone has to identify it, diagnose why the payer rejected it, correct it, resubmit it, and track it. That work happens at a cost per touch, and it happens whether or not the claim ever gets paid. Rework is the expense most DME operations never put a number on, because it’s buried inside salaries that would be paid anyway.
Then there’s the portion that never comes back. A meaningful share of denied claims are simply never reworked — they age out, fall off the aging report, or hit the timely filing wall. Medicare allows 12 months from date of service. Many Medicaid programs and MCOs allow substantially less. A claim that sits in a queue for four months while nobody owns it can become permanently uncollectible without anyone making a decision about it.
Where the cost actually accumulates
- Rework labor Every denial consumes staff time that produces no new revenue. At volume, this is a full FTE’s worth of work that exists only because claims went out wrong.
- AR days Denials extend the gap between service delivery and cash. Equipment is already purchased, delivered, and on the books. The longer AR days run, the more working capital is tied up in claims that haven’t converted.
- Write-offs Claims that miss timely filing or fail appeal become straight margin loss. Unlike a discount, there’s no revenue to offset the cost of goods.
- Compounding error patterns A single misconfigured payer rule doesn’t produce one denial. It produces every claim submitted under that rule until someone catches it — which is usually when the remits come back weeks later.
- Audit exposure Documentation errors that trigger denials are the same errors that surface in a DMEPOS audit. A pattern of incorrect modifiers or missing CMNs isn’t just a billing problem at that point.
Why the math is worse for DME than for most healthcare billing
DME carries inventory risk. A physician practice that gets a claim denied has already delivered the service; the cost is the clinician’s time. A DME supplier has purchased equipment, held it, and put it in a patient’s home. The asset is gone. Capped rentals compound this — a denial in month three of a 13-month rental can jeopardize the entire billing cycle, not one line item.
What changes the equation
Denial management is downstream work. It’s necessary, but the meaningful leverage sits before submission: eligibility verified at intake, prior authorization confirmed before delivery, documentation captured at the point of service, and claim scrubbing that checks HCPCS pairings, modifiers, and payer-specific edits before the claim leaves the building.
A clean claim costs one touch. A denied claim costs several, and sometimes costs the full value of the equipment. The gap between those two numbers is where DME margin lives.
