Clonic hemifacial spasm, unspecified

This code describes involuntary, repetitive, and rhythmic muscle contractions affecting one side of the face, specifically when the exact cause or type of clonic hemifacial spasm is not further specified in the medical record. These spasms are characterized by their rapid, jerking movements, differentiating them from tonic spasms.

Use this code when documentation clearly indicates a diagnosis of hemifacial spasm with clonic characteristics, but the physician has not provided further specificity regarding its etiology or a more precise classification. This code is appropriate when the medical record lacks details to assign a more specific code within the G51.3 category.

• Avoid using this code if the documentation specifies a secondary cause or a more defined type of hemifacial spasm; look for more specific codes within G51.3.
• Ensure the documentation explicitly mentions "clonic" or describes the spasms as rapid, jerking, and repetitive on one side of the face.
• Do not confuse with blepharospasm (G24.5) or other facial tics (G24.4), which have distinct clinical presentations.