G23.3 – Hypomyelination with atrophy of the basal ganglia and cerebellum
ICD-10-CM 2027 diagnosis code · Extrapyramidal and movement disorders
ICD-10-CM code
G23.3
- Code
G23.3(claims format:G233)- Description
- Hypomyelination with atrophy of the basal ganglia and cerebellum
- Short description
- Hypomyelination with atrophy of basal ganglia and cerebellum
- Billable
- Yes – valid for HIPAA-covered transactions
- 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
- Parent codes
- G23
Notes for G23.3
Applicable to:
- H-ABC
- TUBB4A-related neurologic disorders
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
G23 – Other degenerative diseases of basal ganglia
Excludes2 (not included here):
- multi-system degeneration of the autonomic nervous system (G90.3)
Index terms for G23.3
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in G23
- G23.0 – Hallervorden-Spatz diseaseBillable
- G23.1 – Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]Billable
- G23.2 – Striatonigral degenerationBillable
- G23.8 – Other specified degenerative diseases of basal gangliaBillable
- G23.9 – Degenerative disease of basal ganglia, unspecifiedBillable
Frequently asked questions
What is ICD-10 code G23.3?
G23.3 is the ICD-10-CM code for hypomyelination with atrophy of the basal ganglia and cerebellum, in the block G20-G26 (Extrapyramidal and movement disorders).
Is G23.3 a billable code?
Yes. G23.3 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G23.3 belong to?
It belongs to category G23 – Other degenerative diseases of basal ganglia.
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.