ICD-10 Code G20.A – Parkinson’s disease without dyskinesia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G20.A – Parkinson’s disease without dyskinesia
What it is
G20.A identifies Parkinson’s disease when dyskinesia is not documented. Use it for a confirmed Parkinson’s diagnosis with no mention of involuntary movement complications tied to treatment or disease.
Clinical signs
Typical Parkinsonian features include resting tremor, bradykinesia, rigidity, and postural instability. Clinical features vary; refer to documentation.
When to use this code
Use G20.A when the provider documents Parkinson’s disease and specifically states that dyskinesia is absent. It is also appropriate when the record clearly supports Parkinson’s disease without any documented dyskinetic complication. If the note is unclear, check documentation before coding.
Do not use for
Do not use this code if dyskinesia is documented with Parkinson’s disease. Also avoid it when Parkinsonism is described without a confirmed Parkinson’s disease diagnosis; check documentation.
Coding tip
Verify whether dyskinesia is explicitly present or absent in the assessment, because that detail changes code selection.