Is G20 a billable code?
No. G20 is a header code that groups 5 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
G20: Parkinson's disease
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
G20 groups related diagnoses under parkinson's disease. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under G20
- G20.A1Parkinson's disease without dyskinesia, without mention of fluctuations
- G20.A2Parkinson's disease without dyskinesia, with fluctuations
- G20.B1Parkinson's disease with dyskinesia, without mention of fluctuations
- G20.B2Parkinson's disease with dyskinesia, with fluctuations
- G20.CParkinsonism, unspecified
G20 questions
What does G20 mean?
G20 is the ICD-10-CM code for Parkinson's disease. It is in chapter 6, Diseases of the nervous system (G00-G99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.