G23 ICD-10-CM Code: Other degenerative diseases of basal ganglia
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
G23Other degenerative diseases of basal ganglia
ICD-10-CM diagnosis code · United States clinical modification
Where G23 sits
- 1
Chapter 6
Diseases of the nervous system (G00-G99)
- 2
Section
Extrapyramidal and movement disorders (G20-G26)
- 3
Category G23
Other degenerative diseases of basal ganglia
- 4
Code G23
Other degenerative diseases of basal ganglia
Codes under G23
G23 is a non-billable category. Choose the child code that best matches the documented diagnosis.
G23.0Hallervorden-Spatz diseaseG23.1Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]G23.2Striatonigral degenerationG23.3Hypomyelination with atrophy of the basal ganglia and cerebellumG23.8Other specified degenerative diseases of basal gangliaG23.9Degenerative disease of basal ganglia, unspecifiedNotes for this code
Inclusion terms
No inclusion terms are listed for G23.
Code first
No “code first” instruction is listed for G23.
Use additional code
No “use additional code” instruction is listed for G23.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for G23.
Excludes2
Conditions not included here that may be reported separately when present.
- multi-system degeneration of the autonomic nervous system (G90.3)
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code G23 mean?
G23 is the FY 2027 U.S. ICD-10-CM code for “Other degenerative diseases of basal ganglia.”
Is G23 a billable or specific ICD-10-CM code?
No. G23 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is G23 located in ICD-10-CM?
G23 is listed in Chapter 6, Diseases of the nervous system (G00-G99), within Extrapyramidal and movement disorders (G20-G26) (G20–G26), under category G23, Other degenerative diseases of basal ganglia.
What coding notes are listed for G23?
No inclusion terms are listed for G23 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: multi-system degeneration of the autonomic nervous system (G90.3).