G23 – Other degenerative diseases of basal ganglia
ICD-10-CM 2027 diagnosis code · Extrapyramidal and movement disorders
ICD-10-CM code
G23
- Code
G23(claims format:G23)- Description
- Other degenerative diseases of basal ganglia
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G20-G26 Extrapyramidal and movement disorders
Billable codes under G23
G23 is a header code and cannot be used on claims. Choose the most specific code:
- G23.0 – Hallervorden-Spatz diseaseBillable
- G23.1 – Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]Billable
- G23.2 – Striatonigral degenerationBillable
- G23.3 – Hypomyelination with atrophy of the basal ganglia and cerebellumBillable
- G23.8 – Other specified degenerative diseases of basal gangliaBillable
- G23.9 – Degenerative disease of basal ganglia, unspecifiedBillable
Notes for G23
Excludes2 (not included here):
- multi-system degeneration of the autonomic nervous system (G90.3)
Frequently asked questions
What is ICD-10 code G23?
G23 is the ICD-10-CM code for other degenerative diseases of basal ganglia, in the block G20-G26 (Extrapyramidal and movement disorders).
Is G23 a billable code?
No. G23 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.