ICD-10 Code G98.8 – Other disorders of nervous system (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G98.8 – Other disorders of nervous system
What it is
G98.8 is a nonspecific code for nervous system disorders that do not fit a more exact ICD-10 category. Use it when the documentation clearly states another nervous system disorder, but no better code is available.
Clinical signs
Clinical features vary; refer to documentation. Findings may include neurologic dysfunction that is described as atypical, residual, or otherwise unclassified in the record.
When to use this code
Use G98.8 when the provider documents a nervous system disorder that is not named elsewhere in ICD-10-CM. It may apply when the diagnosis is established but the record does not support a more specific code. Check documentation before assigning it as a fallback.
Do not use for
Do not use this code when a specific neurologic diagnosis is documented and indexed elsewhere. It is also inappropriate if the condition is better described by a symptom code or another body-system disorder.
Coding tip
Code the most specific documented neurologic diagnosis first; use G98.8 only after you confirm no more precise option exists.