ICD-10 Code G20.B2 – Parkinson’s disease with dyskinesia, with fluctuations (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G20.B2 – Parkinson’s disease with dyskinesia, with fluctuations
What it is
This code identifies Parkinson’s disease complicated by dyskinesia and motor fluctuations. Use it when documentation shows involuntary movements plus changing “on” and “off” response to therapy.
Clinical signs
Typical findings include Parkinsonian motor symptoms with dyskinesia, such as choreiform or writhing movements, and fluctuating symptom control. Clinical features vary; refer to documentation.
When to use this code
Use G20.B2 when the provider documents Parkinson’s disease with both dyskinesia and fluctuations. It supports cases where medication benefit is inconsistent and involuntary movements are part of the record. If the note does not clearly state both elements, check documentation.
Do not use for
Do not use this code for Parkinson’s disease without dyskinesia or without motor fluctuations. Do not assign it when the record only mentions tremor, rigidity, or general Parkinsonism.
Coding tip
Look for both terms in the assessment or problem list; if one is missing, query the provider before coding.