G23

⚠ Non-billable (Header)

Other degenerative diseases of basal ganglia

Diseases of the nervous system (G00-G99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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⚠️ Excludes2

direct

Both codes can exist if both conditions are documented.

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

Child Codes (6)

G23.0Hallervorden-Spatz disease✓ Billable G23.1Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]✓ Billable G23.2Striatonigral degeneration✓ Billable G23.3Hypomyelination with atrophy of the basal ganglia and cerebellum✓ Billable G23.8Other specified degenerative diseases of basal ganglia✓ Billable G23.9Degenerative disease of basal ganglia, unspecified✓ Billable

Clinical Description

ICD-10-CM code G23 represents other degenerative diseases of basal ganglia. This code falls under the Diseases of the nervous system (G00-G99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

Frequently Asked Questions

What is ICD-10 code G23?

ICD-10-CM code G23 is "Other degenerative diseases of basal ganglia". It belongs to the category: Diseases of the nervous system (G00-G99).

Is G23 a billable ICD-10 code?

No, G23 is a non-billable header code. A more specific child code must be used for billing.

Can G23 be coded with other codes?

G23 has 1 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

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Code Information

CodeG23

BillableNo — Header code

CategoryDiseases of the nervous system (G00-G99)

Excludes10 rule(s)

Excludes21 note(s)

Child codes6

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)