Glossary · Billing

Denial rate

Denial rate is the percentage of submitted claims that payers reject during a given period, calculated by dividing total denied claim dollars by total submitted claim dollars. An orthopedic practice performing well keeps this figure below 5%; the industry average runs 5–10%.

Verified May 8, 2026 · 7 sources ↓

Drawn from MedicalbillersandcodersCMSAAPCOutsourcestrategiesHealthinfoservice

Definition

Source · Editorial summary grounded in 7 cited references ↓

Denial rate quantifies how often an insurer refuses to reimburse a submitted claim after processing it. The standard formula: total dollar value of denied claims ÷ total dollar value of submitted claims, expressed as a percentage. Unlike a rejected claim—which is kicked back before adjudication for a fixable data error—a denied claim has been fully processed and requires investigation, documentation of appeal grounds, and resubmission through the payer's formal dispute channel.

In orthopedic billing, denial rate is a sharper diagnostic than raw revenue numbers because orthopedic claims carry high per-claim dollar values. A single denied joint-replacement or fracture-care claim can represent thousands of dollars. That financial weight means payers apply extra scrutiny: they examine medical necessity documentation, verify prior authorization, cross-check NCCI bundling edits, and audit diagnosis-to-procedure code alignment. Each of these touchpoints is a potential denial trigger that a healthy revenue cycle process must intercept upstream.

A practice-level denial rate below 5% signals tight documentation workflows, accurate coding, and consistent pre-authorization processes. Rates above 10% are a leading indicator of systemic problems—whether that is incomplete operative notes, outdated CPT codes, missing written orders for DMEPOS items, or staff unfamiliar with payer-specific coverage policies. Tracking denial rate by payer, by procedure category, and by denial reason code is the first step toward targeted remediation.

Why it matters

A rising denial rate directly delays cash flow—orthopedic denials can push payment cycles out by weeks or months—and a persistently high rate invites payer audits and OIG scrutiny, particularly when modifier 59 or X-modifiers appear frequently on shoulder or multi-structure cases. CMS CERT data for orthopedic footwear showed a 100% improper payment rate in 2023 (projected $4.3 million), driven almost entirely by insufficient documentation; that figure dropped to 0% the following year after providers tightened documentation practices. That single example illustrates how denial rate is both an early-warning metric and a direct measure of compliance exposure.

Common mistakes

Where people most often go wrong with this concept.

Source · Editorial brief grounded in cited references ↓

Conflating rejected claims with denied claims: rejected claims fail intake edits and can be corrected and resubmitted immediately; denied claims require a formal appeal and root-cause analysis before resubmission.
Tracking denial rate by claim volume alone rather than by dollar value, which masks the outsized financial impact of high-cost orthopedic procedures like total joint replacements and spine fusions.
Calculating denial rate across all payers in aggregate, obscuring that Medicare, commercial, and workers' compensation carriers each have different prior-authorization and documentation thresholds that drive denial rate differently.
Ignoring NCCI bundling edits on shoulder procedures—CMS treats the shoulder as a single anatomic area, so billing 29822 alongside 29827 on the same shoulder without a valid modifier will reliably inflate denial rate.
Failing to obtain a completed written order prior to delivery for DMEPOS items (e.g., orthotic footwear): under LCD L33641, claims submitted without a signed written order are denied as not reasonable and necessary, a preventable contributor to denial rate.
Not stratifying denial rate by denial reason code (CO-4, CO-11, CO-50, CO-97, etc.), which prevents staff from identifying whether the root cause is coding inaccuracy, medical necessity, or authorization failure.

Related codes

Codes commonly involved when this concept appears in practice.

CPT

ICD-10

M17.11 M16.11

Modifiers

59 Distinct procedural service XS Separate structure KX Medical-policy requirements met

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 7 cited references ↓

01What is a good denial rate for an orthopedic practice?

Below 5% is the target benchmark. The industry average across specialties runs 5–10%, but high-value orthopedic claims warrant aiming lower because each denied claim represents a large dollar amount and a costly appeals process.

02How is denial rate calculated?

Divide the total dollar value of claims denied by payers in a given period by the total dollar value of claims submitted in that same period, then multiply by 100. Using dollar values rather than claim counts gives a more accurate picture for orthopedic practices where procedure values vary widely.

03What are the most common denial drivers in orthopedic billing?

Incomplete or missing documentation (the top driver—84.5% of improper orthopedic footwear payments in 2023 per CMS CERT data), prior authorization failures, NCCI bundling violations, diagnosis-to-procedure code mismatches, and expired or missing written orders for DMEPOS items.

04What is the difference between a denied claim and a rejected claim?

A rejected claim fails before adjudication—typically a data entry or format error—and can be corrected and resubmitted directly. A denied claim has been fully processed by the payer, which issued a negative coverage determination; it requires a formal appeal with supporting documentation.

05Can a denied orthopedic claim be appealed?

Yes. Most payers have a multi-level appeals process. The first step is identifying the specific denial reason code on the remittance advice, gathering the relevant clinical documentation or authorization evidence, and submitting a written appeal within the payer's filing deadline—typically 90 to 180 days from the denial date.

06Why do orthopedic practices tend to have higher denial rates than primary care?

Orthopedic procedures involve high claim values, complex NCCI bundling rules, mandatory prior authorizations for most surgical and advanced imaging services, detailed operative documentation requirements, and multiple payer types (Medicare, commercial, workers' compensation) each with distinct policies—each variable being an independent denial risk.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira flags documentation elements that are statistically associated with downstream denials before a claim is submitted. For orthopedic encounters, this includes: (1) verifying that operative notes contain explicit medical necessity language tied to the primary ICD-10-CM diagnosis, not just a procedure description; (2) confirming that any DMEPOS order (orthotic footwear, AFO/KAFO) is signed and dated prior to delivery per LCD L33641 and L33686 requirements; (3) alerting when a shoulder procedure combination triggers a known NCCI PTP edit (e.g., 29822 + 29827 same shoulder) so the coder can verify modifier eligibility before billing; and (4) surfacing payer-specific prior-authorization requirements at the time of documentation so the surgeon's note already supports the authorization on file. Each of these interventions targets a documented top-tier denial reason in orthopedic billing: insufficient documentation, missing WOPD, bundling errors, and failed prior authorization. Mira does not auto-apply modifiers or override coder judgment; it surfaces the risk and the relevant policy reference so the billing team can act before the claim leaves the practice.

See Mira's approach

Related terms

Prior authorization Billing

Prior authorization (PA) is a payer requirement that a provider obtain approval before delivering a specific service, procedure, or item—otherwise the claim will be denied regardless of medical necessity. Approval is granted when submitted clinical documentation meets the payer's coverage criteria.

Medical necessity Compliance

Medical necessity is the standard requiring that a service or item be reasonable and appropriate for diagnosing or treating a patient's condition according to accepted clinical practice. Payers—including Medicare—use this standard to determine whether a claim will be covered and paid.