ICD-10 Code G51.8 – Other disorders of facial nerve (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G51.8 – Other disorders of facial nerve
What it is
G51.8 identifies facial nerve disorders that do not fit a more specific diagnosis in the ICD-10-CM category. Use it for documented facial nerve problems when the record does not support Bell palsy, paralysis, or another named condition.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings may include facial weakness, asymmetry, reduced facial movement, or abnormal facial sensation tied to facial nerve dysfunction.
When to use this code
Use this code when the clinician documents an unspecified or other facial nerve disorder and no more specific facial nerve code applies. It may fit follow-up visits, specialist assessments, or cases where the diagnosis remains broad after evaluation. Check documentation if laterality or a more exact cause is recorded.
Do not use for
Do not use G51.8 when the chart supports a more specific facial nerve diagnosis, such as Bell palsy or facial paralysis. Also avoid it if the problem is clearly due to another neurologic or traumatic condition.
Coding tip
Code the most specific facial nerve diagnosis available; if the provider only says “facial nerve disorder,” G51.8 may be appropriate.