Claims Denial Rates Up, Prior Auth Denials Down in 2024: Report

Becker's reporting on 2024 denial trends surfaces a counterintuitive pattern that physician practices should examine carefully: overall claims denial rates increased in 2024 even as prior authorization-specific denials decreased. This divergence suggests that payers are shifting denial behavior rather than reducing it — denying claims at different points in the revenue cycle while easing the prior authorization bottleneck that has drawn the most regulatory and public attention. For practices interpreting their own denial data, understanding this shift is essential for developing effective prevention and appeal strategies.

The Shifting Denial Pattern

The decline in prior authorization-specific denials likely reflects multiple factors: state-level PA reform legislation taking effect, the CMS interoperability rule creating forward pressure on payer PA processes, and public commitments from major payers to reduce PA volume. These are genuine improvements in the PA landscape.

However, the simultaneous increase in overall denial rates indicates that the total volume of denials is not decreasing — it is migrating. If practices are seeing fewer PA denials but more post-service denials for medical necessity, clinical validation, or documentation insufficiency, the net impact on revenue and administrative burden may be neutral or even negative. Post-service denials are in some respects more damaging than PA denials because the clinical work has already been performed — the practice has incurred the cost of delivering care and is now fighting to be paid for it.

Where Denials Are Moving

Industry data suggests several categories are absorbing the denial volume that was previously concentrated in prior authorization:

• Clinical validation denials: Payers challenging whether the documented clinical condition supports the billed level of service, particularly for inpatient admissions
• Medical necessity denials post-service: Retrospective review determining that a service was not medically necessary after it has been provided
• Documentation insufficiency: Claims denied not because the service was inappropriate but because the documentation submitted did not meet the payer's evidentiary standard
• Coding accuracy challenges: Increased scrutiny of code selection, modifier usage, and diagnosis-procedure alignment

Each of these denial categories requires a different prevention and appeal approach than prior authorization denials. PA denials can be addressed upstream through better submission processes. Post-service denials require stronger clinical documentation at the point of care and more sophisticated appeal strategies that connect clinical evidence to payer coverage criteria.

What This Means for Practice Strategy

The shifting denial pattern has strategic implications for how practices allocate denial management resources. A practice that has invested heavily in PA workflow optimization may find that its denial rate has not improved because denials are now arriving through different mechanisms. Effective denial management in this environment requires monitoring denial trends by category, not just in aggregate.

Practices should be tracking:

• Denial rates by reason code category, not just overall denial rate
• Changes in denial mix over time — are certain denial types increasing while others decrease?
• Denial rates by payer, since the shift may be more pronounced with some insurers than others
• The financial impact of each denial category, since post-service denials for high-dollar services have a larger revenue impact than PA denials for routine services

The Broader Implication

The 2024 denial data suggests that payer denial behavior is adaptive. As regulatory and public pressure reduces one category of denials, volume shifts to other categories that face less scrutiny. Practices need denial management approaches that are equally adaptive — capable of identifying emerging denial patterns, adjusting prevention strategies, and crafting appeals that address the specific clinical and administrative arguments payers are currently deploying. The denial landscape is not static. Practice denial management cannot be static either.