AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2018 Issue 4; New/Revised ICD-10-CM Codes

Clonic Hemifacial Spasm

Codes were created to allow the reporting of clonic hemifacial spasm laterality: G51.31  Clonic hemifacial spasm, right G51.32  Clonic hemifacial spasm, left G51.33  Clonic hemifacial spasm, bilateral and G51.39  Clonic hemifacial spasm, unspecified Hemifacial spasm is a neuromuscular condition that causes brief, involuntary, irregular clonic or tonic movement of muscles that are innervated by the seventh cranial nerve. The condition usually begins with a brief twitching of the eyelid muscle on one side of the face. The twitch may pull the eyelid down to completely shut the eye. As it progresses, the condition may ultimately...

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