ICD-10 Code G20.B1 – Parkinson’s disease with dyskinesia, without mention of fluctuations (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G20.B1 – Parkinson’s disease with dyskinesia, without mention of fluctuations
What it is
This code identifies Parkinson’s disease when dyskinesia is documented, but motor fluctuations are not mentioned. Use it for patients with Parkinsonian symptoms plus involuntary movement complications tied to the disease.
Clinical signs
Typical findings include resting tremor, bradykinesia, rigidity, and postural instability, with dyskinesia described as involuntary, often choreiform movements. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record clearly states Parkinson’s disease with dyskinesia and does not document fluctuations. It may appear in neurology notes, problem lists, or discharge summaries. If fluctuations are also documented, select the more specific code.
Do not use for
Do not use it when dyskinesia is absent or when the note only says Parkinson’s disease. Do not assume fluctuations are present; Check documentation.
Coding tip
Code only what the provider documents, and verify whether fluctuations are mentioned before assigning this specific Parkinson’s code.