ICD-10 Code G93.40 – Encephalopathy, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G93.40 – Encephalopathy, unspecified
What it is
G93.40 identifies encephalopathy when the provider documents a general brain dysfunction but does not specify the cause or type. It is a nonspecific diagnosis code used when the chart supports encephalopathy, unspecified.
Clinical signs
Common findings include altered mental status, confusion, reduced alertness, disorientation, or impaired cognition. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states encephalopathy and no further detail is documented. It may apply to inpatient or outpatient encounters where the provider has not identified a specific cause, such as metabolic, toxic, or hepatic encephalopathy. You should code the documented condition, not infer a more specific type.
Do not use for
Do not use G93.40 if the provider documents a more specific encephalopathy type or another confirmed primary diagnosis. Do not use it for transient confusion alone without documented encephalopathy. Check documentation.
Coding tip
Always look for the underlying cause and any more specific encephalopathy term before assigning G93.40.