ICD-10 Code G51.31 – Clonic hemifacial spasm, right (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G51.31 – Clonic hemifacial spasm, right
What it is
This code identifies a clonic spasm affecting the right side of the face. It refers to involuntary, repeated muscle contractions on one side, documented as right-sided hemifacial involvement.
Clinical signs
Typical findings include intermittent, repetitive twitching of facial muscles on the right. Clinical features vary; refer to documentation for laterality and whether the spasm is clonic rather than tonic or another facial movement disorder.
When to use this code
Use G51.31 when the record clearly states right-sided clonic hemifacial spasm. You should also use it when the clinician documents unilateral facial twitching or spasms and specifies the right side. Check documentation if laterality or spasm type is unclear.
Do not use for
Do not use this code for left-sided or unspecified hemifacial spasm. It is also inappropriate if the note describes another facial nerve disorder, generalized muscle twitching, or a different movement disorder.
Coding tip
Confirm both the side and the spasm type in the provider note before assigning this code.