2026 ICD-10-CM Diagnosis Code G20.B1Parkinson's disease with dyskinesia, without mention of fluctuations

ICD-10-CM Codes›G00–G99›G20-G26›G20

ICD-10-CM G20.B1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G20.B1 is a billable ICD-10-CM diagnosis code for Parkinson's disease with dyskinesia, without mention of fluctuations. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parkinson`s disease.

Code Identity

ICD-10-CM Code
G20.B1
Billable Status
Yes — Valid for Submission
Code Describes
Parkinson's disease with dyskinesia, without mention of fluctuations
Short Description
Parkinson's dis with dyskinesia, w/o mention of fluctuations
Parent Code
G20.B
Parkinson's disease with dyskinesia

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG20-G26Extrapyramidal and movement disorders
CategoryG20Parkinson's disease
This CodeG20.B1Parkinson's disease with dyskinesia, without mention of fluctuations

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Parkinson's disease with dyskinesia, without mention of OFF episodes

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disease, diseased
      • Parkinson's
        • with dyskinesia
          • without mention of
            • fluctuations
    • Disease, diseased
      • Parkinson's
        • with dyskinesia
          • without mention of
            • OFF episodes

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NVS004
Parkinson`s disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement G20.B1 replaces the following previously assigned code(s):

  • G20 - Parkinson's disease
FY 2024AddedAdded to the ICD-10-CM code setEffective October 1, 2023.
FY 2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G20.B1Overview

Is G20.B1 (Parkinson's disease with dyskinesia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report Parkinson's disease with dyskinesia, without mention of fluctuations on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.