G20.A

Non-Billable

ChapterG00–G99

Ranksubcategory

Official Description

Parkinson's disease without dyskinesia

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 6: Diseases of the Nervous System (G00-G99).

General instructions are available for the parent sections:

View CH6 Notes View G20 Notes

Clinical Hierarchy

CH6Diseases of the nervous system (G00-G99)

G20-G26Extrapyramidal and movement disorders (G20-G26)

G20Parkinson's disease

G20.AParkinson's disease without dyskinesia

G20.A1Parkinson's disease without dyskinesia, without mention of fluctuations

G20.A2Parkinson's disease without dyskinesia, with fluctuations

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to G20.A:

categoryG20

Parkinson's disease

View context instructions

chapterCH6

Diseases of the nervous system (G00-G99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to G20.A. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

8 raw paths

Dementia (degenerative (primary)) (persisting) (unspecified severity) (without behavioral disturbance, psychotic disturbance, mood disturbance, and anxiety)3 unique routes

in (due to)

Parkinson's disease→G20.A

with(2 variants)

Parkinson's disease→G20.A(2 variants)

with behavioral disturbance→G20.A

Disease, diseased5 unique routes

Parkinson's→G20.A(5 variants)

without dyskinesia(4 variants)

with(2 variants)

fluctuations→G20.A

OFF episodes→G20.A

without mention of(2 variants)

fluctuations→G20.A

OFF episodes→G20.A

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Parkinson's disease without dyskinesia.

Search PCS Codes