U.S. ICD-10-CM · FY 2027

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.

Code definition

Official description

G23

Other degenerative diseases of basal ganglia

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where G23 sits

  1. 1

    Chapter 6

    Diseases of the nervous system (G00-G99)

  2. 2

    Section

    Extrapyramidal and movement disorders (G20-G26)

  3. 3

    Category G23

    Other degenerative diseases of basal ganglia

  4. 4

    Code G23

    Other degenerative diseases of basal ganglia

More specific choices

Codes under G23

G23 is a non-billable category. Choose the child code that best matches the documented diagnosis.

G23.0

Hallervorden-Spatz disease

G23.1

Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]

G23.2

Striatonigral degeneration

G23.3

Hypomyelination with atrophy of the basal ganglia and cerebellum

G23.8

Other specified degenerative diseases of basal ganglia

G23.9

Degenerative disease of basal ganglia, unspecified

Documentation details

Notes 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)

Transparency

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.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

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).

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