G20.AHeader code — not billable
Parkinson's disease without dyskinesia
- Chapter
- 6. Diseases of the nervous system
- Category
- G20
- Effective date
- October 1, 2026
Related codes in category G20
G20Parkinson's diseaseG20.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.A?
G20.A is an ICD-10-CM diagnosis code for Parkinson's disease without dyskinesia.
Is G20.A a billable code?
No. G20.A 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.A in?
G20.A falls under Chapter 6: Diseases of the nervous system.
When did G20.A become effective?
G20.A has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to G20.A?
G20.A 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.