Facial myokymia

This code represents involuntary, fine, undulating contractions of muscle fibers, typically affecting the facial muscles. These contractions are often visible as a rippling or quivering beneath the skin, distinct from fasciculations or tremors. Facial myokymia can be unilateral or bilateral and may be persistent or intermittent.

Assign this code when documentation clearly indicates the presence of facial myokymia, often observed during neurological examination. This diagnosis is supported by physician notes describing the characteristic muscle rippling of the face. It is frequently associated with conditions like multiple sclerosis, brainstem lesions, or hemifacial spasm.

• Differentiate from facial tics (R25.6) or blepharospasm (G24.5), which involve more sustained or repetitive muscle contractions.
• Always review documentation for the underlying cause of the myokymia; code the primary neurological condition first if known and applicable.
• Ensure the physician's notes specifically use terms like "myokymia" or describe the characteristic undulating muscle contractions of the face.