ICD-10 Code G93.7 – Reye’s syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G93.7 – Reye’s syndrome
What it is
G93.7 identifies Reye’s syndrome, a rare but serious condition that affects the brain and liver. It is typically documented in children or adolescents with acute encephalopathy after a viral illness.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include vomiting, confusion, lethargy, and altered mental status, with possible liver dysfunction and cerebral edema.
When to use this code
Use this code when the provider documents Reye’s syndrome or clearly describes the condition in the record. It is appropriate for confirmed cases with acute encephalopathy and associated hepatic involvement. If the diagnosis is only suspected, check documentation before assigning the code.
Do not use for
Do not use this code for routine viral illness, simple hepatitis, or unspecified encephalopathy without documentation of Reye’s syndrome. Check documentation if the chart does not clearly support the diagnosis.
Coding tip
Code Reye’s syndrome only when the provider explicitly links the encephalopathy and liver findings to this diagnosis.