When was the last time your team won an appeal on a clinical validation downgrade? If you have to stop and think about it, you are not alone.

Payer behavior has made this harder than it used to be. Clinical validation audits are driving a marked rise in Diagnosis-Related Group (DRG) downgrades, forcing hospitals to defend diagnoses that, for years, were accepted on the strength of a physician’s documentation alone. As audits grow more frequent and the criteria keep shifting, traditional coding and documentation practices no longer secure full reimbursement.

The exposure is real. In 2025, hospitals spent nearly $18 billion overturning claims denials, according to the American Hospital Association. Against margins this thin, even a modest rate of downgrades adds up quickly.

But the teams that protect the most revenue don’t just win more appeals. They reduce their exposure earlier, before claims are submitted and contracts are signed.

Traditional DRG validation audits confirm that diagnoses and procedures are coded and sequenced correctly, in line with the official ICD-10-CM guidelines. In that review, a provider’s statement that a condition exists is generally enough for code assignment, because the focus is on applying coding rules rather than second-guessing the clinical reasoning behind the diagnosis.

Clinical validation audits work differently. Since their introduction in the 2011 Recovery Audit Contractor (RAC) Statement of Work , payers have applied a separate standard, testing whether objective evidence in the medical record, such as laboratory results, imaging, clinical signs, and treatment response, supports the diagnosis itself.

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