ICD-10 Code G92.9 – Unspecified toxic encephalopathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G92.9 – Unspecified toxic encephalopathy
What it is
G92.9 identifies toxic encephalopathy when the cause is toxic or chemical, but the documentation does not specify the exact agent or type. Use it for an encephalopathic state linked to a toxin when details are incomplete.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include altered mental status, confusion, reduced alertness, or cognitive slowing in the setting of a suspected toxic exposure.
When to use this code
Use this code when the clinician documents toxic encephalopathy but does not name the toxic substance or provide a more specific diagnosis. It may also fit when the record confirms toxicity-related brain dysfunction, yet the exact cause remains unclear. Check documentation for the exposure source.
Do not use for
Do not use this code for encephalopathy with a clearly documented specific toxin when a more precise code is available. It is also not for nonspecific delirium or confusion without toxic etiology.
Coding tip
Query for the causative substance or agent before assigning G92.9 if the record only says “toxic encephalopathy.”