ICD-10 Code G51.3 – Clonic hemifacial spasm (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G51.3 – Clonic hemifacial spasm
What it is
G51.3 identifies clonic hemifacial spasm, a disorder causing repeated, involuntary twitching on one side of the face. It is coded when the provider documents this specific facial movement disorder.
Clinical signs
Typical findings include intermittent, repetitive contractions of facial muscles on one side, often starting around the eye and spreading to other facial areas. Clinical features vary; refer to documentation.
When to use this code
Use G51.3 when the record clearly states clonic hemifacial spasm or an equivalent diagnosis from the treating clinician. This code fits outpatient, inpatient, or specialty notes that document unilateral facial spasms as the condition being evaluated or followed.
Do not assign it for nonspecific facial twitching unless the provider confirms hemifacial spasm. If the note suggests another neurologic or facial nerve disorder, code the documented condition instead.
Do not use for
Do not use G51.3 for general muscle twitching, seizure activity, or facial weakness without spasm. Check documentation if the diagnosis is uncertain or if another facial nerve disorder is recorded.
Coding tip
Code only when the provider names hemifacial spasm; otherwise, query or check documentation for a more specific diagnosis.