ICD-10 Code G98 – Other disorders of nervous system not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G98 – Other disorders of nervous system not elsewhere classified
What it is
G98 is a broad category for nervous system disorders that do not fit a more specific ICD-10-CM diagnosis. Use it only when the chart documents a nervous system condition but gives insufficient detail for a narrower code.
Clinical signs
Clinical features vary; refer to documentation. Findings may include neurologic symptoms or abnormal exam results, but the record should identify a nervous system disorder that is not classified elsewhere.
When to use this code
Use G98 when the provider documents a nervous system disorder and no more specific code is supported. It is appropriate when the diagnosis is confirmed, but the available details do not allow a better-defined code. Check documentation carefully before assigning this category.
Do not use for
Do not use G98 when a specific neurologic diagnosis is documented and indexed elsewhere in ICD-10-CM. Also avoid it for symptoms alone, such as weakness or numbness, unless the provider identifies a qualifying nervous system disorder.
Coding tip
Query for specificity whenever possible, because G98 should be a fallback code, not the first choice.