ICD-10 Code G20.B – Parkinson’s disease with dyskinesia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G20.B – Parkinson’s disease with dyskinesia
What it is
G20.B identifies Parkinson’s disease when dyskinesia is documented. Use it for Parkinson’s disease with involuntary, medication-related movement complications, not for Parkinsonism in general.
Clinical signs
Typical findings include Parkinsonian motor features such as tremor, rigidity, bradykinesia, or postural instability, plus dyskinesia. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents Parkinson’s disease and specifically notes dyskinesia. It fits encounters focused on ongoing management of Parkinson’s with abnormal involuntary movements. If the record only says Parkinson’s disease without dyskinesia, check documentation.
Do not use for
Do not use it for Parkinsonism without a documented diagnosis of Parkinson’s disease. Do not assign it when dyskinesia is present but not linked to Parkinson’s disease; check documentation.
Coding tip
Look for explicit provider wording connecting dyskinesia to Parkinson’s disease before assigning G20.B.