Fasciculation

This code represents the involuntary, localized, visible twitching of a small bundle of muscle fibers, often without gross movement of the limb. Fasciculations are typically benign but can also be a sign of underlying neurological conditions affecting motor neurons.

Use this code when documentation explicitly states "fasciculations" as a presenting symptom or finding. This is appropriate for both benign fasciculation syndrome and fasciculations observed in the context of more serious conditions like amyotrophic lateral sclerosis (ALS) or spinal muscular atrophy (SMA).

• Do not code fasciculations as a primary diagnosis if a definitive underlying neurological condition causing them has been established and is being treated.
• Always review the medical record for associated symptoms or a confirmed diagnosis that may provide a more specific code.
• Consider sequencing this code as a secondary diagnosis when it is a significant symptom contributing to the patient's presentation or management, even if an underlying cause is known.