ICD-10 Code G52.9 – Cranial nerve disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G52.9 – Cranial nerve disorder, unspecified
What it is
G52.9 identifies a disorder affecting one or more cranial nerves when the specific nerve or cause is not documented. Use it when the record states a cranial nerve problem but does not name the nerve.
Clinical signs
Clinical features vary; refer to documentation. Findings may include weakness, numbness, pain, or sensory changes in a cranial nerve distribution, but the exact pattern depends on the nerve involved.
When to use this code
Use this code when the clinician documents cranial nerve disorder, cranial neuropathy, or similar wording without further specification. It also fits when the affected cranial nerve is not identified in the note. If later documentation names the nerve or cause, code the more specific diagnosis.
Do not use for
Do not use G52.9 when the record clearly identifies a specific cranial nerve disorder or another defined neurologic condition. Check documentation if the finding is better explained by trauma, infection, tumor, or another coded diagnosis.
Coding tip
Query the provider for the exact cranial nerve and underlying cause whenever the documentation is vague.