Myoclonus

This code represents myoclonus, which is a sudden, involuntary, brief, and shock-like jerking movement caused by muscle contractions (positive myoclonus) or inhibitions (negative myoclonus). These movements can be focal, segmental, or generalized and may occur spontaneously or be induced by stimuli. It is a symptom of an underlying neurological disorder rather than a disease itself.

Use this code when documentation clearly indicates the presence of myoclonus as a primary symptom or a significant finding. This applies to cases of essential myoclonus, symptomatic myoclonus (e.g., post-anoxic, metabolic, drug-induced), or when myoclonus is a prominent feature of a broader neurological syndrome. Ensure the physician's notes explicitly describe the involuntary jerking movements.

• Do not use this code if the myoclonus is a transient, physiological phenomenon (e.g., sleep starts, hiccups) unless it is pathologically severe or persistent.
• Always attempt to code the underlying cause of the myoclonus first, if known and documented, as myoclonus is often a manifestation of another condition.
• Differentiate from other movement disorders such as tics, tremors, or chorea; myoclonus is characterized by its sudden, shock-like nature.