G20Header code — not billable
Parkinson's disease
- Chapter
- 6. Diseases of the nervous system
- Category
- G20
- Effective date
- October 1, 2026
Related codes in category G20
G20.AParkinson's disease without dyskinesiaG20.A1Parkinson's dis w/o dyskinesia, w/o mention of fluctuationsYesG20.A2Parkinson's disease without dyskinesia, with fluctuationsYesG20.BParkinson's disease with dyskinesiaG20.B1Parkinson's dis with dyskinesia, w/o mention of fluctuationsYesG20.B2Parkinson's disease with dyskinesia, with fluctuationsYesG20.CParkinsonism, unspecifiedYes
Frequently asked questions
What is ICD-10 code G20?
G20 is an ICD-10-CM diagnosis code for Parkinson's disease.
Is G20 a billable code?
No. G20 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is G20 in?
G20 falls under Chapter 6: Diseases of the nervous system.
When did G20 become effective?
G20 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G20?
G20 belongs to category G20, which includes 7 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.