ICD-10 Code G94 – Other disorders of brain in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G94 – Other disorders of brain in diseases classified elsewhere
What it is
G94 identifies brain disorders caused by another underlying disease, rather than a primary brain condition. Use it when the brain problem is documented as secondary to a separate, known disease.
Clinical signs
Clinical features vary; refer to documentation. Findings may include neurologic changes such as altered cognition, movement problems, or other brain dysfunction linked to the underlying disorder.
When to use this code
Use G94 when the provider documents a disorder of the brain due to another disease and no more specific ICD-10-CM code applies. Confirm the causal relationship and the underlying condition in the record. Code the underlying disease first when instructed by official coding guidance.
Do not use for
Do not use this code for primary brain diseases, injuries, or nonspecific neurologic symptoms without documented brain involvement. Check documentation if the record does not clearly link the brain disorder to another disease.
Coding tip
Always verify the documented cause and sequence codes so you capture both the underlying disease and the secondary brain disorder correctly.