2026 ICD-10-CM Diagnosis Code G23Other degenerative diseases of basal ganglia

ICD-10-CM Codes›G00–G99›G20-G26›G23

ICD-10-CM G23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G23 is a non-billable ICD-10-CM category code for other degenerative diseases of basal ganglia, so it cannot be submitted on claims. Use a more specific code from this category instead, such as G23.0, G23.1, G23.2, and G23.3.

Code Identity

ICD-10-CM Code
G23
Billable Status
No — Non-Billable Category
Code Describes
Other degenerative diseases of basal ganglia
Short Description
Other degenerative diseases of basal ganglia
Same as the full description in the CMS dataset.
Chapter
G20-G26
Extrapyramidal and movement disorders

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG20-G26Extrapyramidal and movement disorders
CategoryG23Other degenerative diseases of basal ganglia
This CodeG23Other degenerative diseases of basal ganglia

Specific Coding for Other degenerative diseases of basal gangliaOverview

Non-specific codes like G23 require more characters. Use one of these billable codes instead:

  • Use G23.0 for Hallervorden-Spatz disease

  • Use G23.1 for Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]

  • Use G23.2 for Striatonigral degeneration

  • Use G23.3 for Hypomyelination with atrophy of the basal ganglia and cerebellum

  • Use G23.8 for Other specified degenerative diseases of basal ganglia

  • Use G23.9 for Degenerative disease of basal ganglia, unspecified

Tabular List NotesGuidance

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

Type 2 Excludes

  • multi-system degeneration of the autonomic nervous system G90.3

Patient EducationClinical

Brain Diseases

Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G23Overview

Is G23 (Other degenerative diseases of basal ganglia) a billable code?

No. This is a category header that groups the codes for other degenerative diseases of basal ganglia, and headers cannot be submitted on claims. Claims for other degenerative diseases of basal ganglia need a more specific code from this category, such as G23.0, G23.1, and G23.2.