8B88.2 Hemifacial spasm

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2026-01

Hemifacial spasm (HFS) is a movement disorder most commonly caused by vascular compression of the VII cranial nerve at its root exit zone from the brainstem. It manifests as involuntary contractions and twitching on ipsilateral side of the face.

synonyms

• Hemifacial spasm
• Clonic hemifacial spasm
• Bell spasm
• facial spasm NEC
• myoclonus facial spasm

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