ICD-10 Code G25.3 – Myoclonus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G25.3 – Myoclonus
What it is
Myoclonus is a movement disorder marked by sudden, brief, involuntary muscle jerks. You use this code when the record documents myoclonic movements without a more specific underlying diagnosis.
Clinical signs
Typical findings include quick, shock-like jerks that may affect one muscle, a group of muscles, or the whole body. Clinical features vary; refer to documentation.
When to use this code
Use G25.3 when the provider diagnoses myoclonus as the primary reason for the encounter or as a documented neurologic finding. It may appear as an isolated symptom, a chronic movement disorder, or part of another condition if the record still identifies myoclonus. If the note identifies a separate underlying cause, code that condition as well when supported by documentation.
Do not use for
Do not use this code for tremor, seizure activity, or other involuntary movements unless the documentation specifically says myoclonus. Check documentation when the cause is unclear.
Coding tip
Query for the exact clinician wording if the record only says “jerking” or “spasms.”