Why DME Claims Really Get Denied, and What Actually Gets Them Overturned

The national initial-denial rate across US healthcare claims sits at roughly 12.6% in 2026, translating to about 806 million denied claims a year and an estimated $262 billion in system-wide cost. For DME and post-acute categories specifically, denial rates run considerably higher than that average. But the number that should actually change how a billing operation behaves isn’t the denial rate. It’s the appeal rate, and the enormous gap between how often denials get reversed and how rarely anyone bothers to challenge them.

Most denials aren’t a clinical disagreement

When a claim comes back denied, it’s easy to assume a payer looked at the documentation and decided the equipment wasn’t medically necessary. In practice, the top denial drivers reported across the industry are procedural, not clinical: missing precertification (CARC code 197), a diagnosis code that doesn’t line up with the procedure billed (CARC 11), and missing information on the claim itself (CARC 16). Those three categories account for the majority of denials that billing teams see, and every one of them is preventable before the claim ever goes out.

The overturn rate is the story nobody’s telling

Prior authorization data on Medicare Advantage plans, tracked by KFF, shows that when a denial is formally appealed, it gets fully or partially overturned in roughly 4 out of 5 cases. The service was medically necessary. The documentation existed. It just wasn’t formatted, coded, or submitted the way the payer’s system required the first time.

And yet fewer than 12% of denials nationally ever get appealed at all. For a DME supplier running on thin margins, that’s revenue that was earned and never collected, for a reason that had nothing to do with patient care.

Why prior authorization specifically carries so much weight

A missing or expired authorization typically triggers an automatic denial that gets rejected on the procedural fact that the step wasn’t completed, not on the merits. CMS’s own Interoperability and Prior Authorization Final Rule, with key provisions taking effect January 1, 2026, requires faster payer decisions (7 days standard, 72 hours urgent), specific denial reason codes, and public reporting of approval and denial rates starting this year, saving an estimated $15 billion over ten years in administrative burden.

What an in-network billing operation should actually be doing

• Track authorization status before the claim ships, not after a denial arrives.
• Separate procedural denials from clinical ones at intake.
• Appeal by default, not by exception. Overturn rates above 80% rarely favor skipping the appeal.
• Use the new CMS reporting requirements as a benchmark against in-network payer relationships.