G23: Other degenerative diseases of basal ganglia
Codes under G23 (Other degenerative diseases of basal ganglia). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| G23.0 | Hallervorden-Spatz disease | ✓ |
| G23.0 | Hallervorden-Spatz disease | ✓ |
| G23.1 | Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski] | ✓ |
| G23.1 | Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski] | ✓ |
| G23.2 | Striatonigral degeneration | ✓ |
| G23.2 | Striatonigral degeneration | ✓ |
| G23.3 | Hypomyelination with atrophy of the basal ganglia and cerebellum | ✓ |
| G23.3 | Hypomyelination with atrophy of the basal ganglia and cerebellum | ✓ |
| G23.8 | Other specified degenerative diseases of basal ganglia | ✓ |
| G23.8 | Other specified degenerative diseases of basal ganglia | ✓ |
| G23.9 | Degenerative disease of basal ganglia, unspecified | ✓ |
| G23.9 | Degenerative disease of basal ganglia, unspecified | ✓ |
Frequently asked questions
What is ICD-10-CM code G23?
G23 is an ICD-10-CM category covering Other degenerative diseases of basal ganglia. It contains 12 more specific diagnosis codes, 12 of which are billable.
Is G23 a billable code?
No — G23 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example G23.0 — Hallervorden-Spatz disease). 12 of the 12 codes under G23 are billable.
What codes fall under G23?
G23 includes G23.0, G23.0, G23.1, G23.1, G23.2, plus 7 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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