ICD-10 Code G24.2 – Idiopathic nonfamilial dystonia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G24.2 – Idiopathic nonfamilial dystonia
What it is
Idiopathic nonfamilial dystonia is a movement disorder with involuntary muscle contractions that cause twisting, abnormal postures, or repetitive movements. “Idiopathic” means the cause is not identified, and “nonfamilial” means there is no known inherited pattern.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include sustained or intermittent muscle contractions, abnormal posturing, and task-related or action-induced movements. Symptoms may affect one body region or more than one, depending on the documented pattern.
When to use this code
Use G24.2 when the record specifically identifies idiopathic dystonia without a familial or known secondary cause. This code fits cases where the clinician documents dystonia as primary, nonfamilial, or unexplained after evaluation. Check documentation if the cause is linked to drugs, disease, or another neurologic disorder.
Do not use for
Do not use this code for dystonia clearly caused by medication, another medical condition, or a hereditary form. If the note does not distinguish idiopathic from secondary or familial dystonia, check documentation before assigning G24.2.
Coding tip
Code G24.2 only when the provider explicitly documents idiopathic nonfamilial dystonia; otherwise, verify the cause and type before coding.