G23.3
✓ Billable
Hypomyelination with atrophy of the basal ganglia and cerebellum
ICD-10-CM · FY2026 · Diseases of the Nervous System
Code
G23.3
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Nervous System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code G23.3?
ICD-10-CM code G23.3 represents Hypomyelination with atrophy of the basal ganglia and cerebellum. It is a billable diagnosis code in the Diseases of the Nervous System chapter, effective October 1, 2025 – September 30, 2026.
Is G23.3 billable?
Yes. G23.3 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is G23.3 in?
G23.3 belongs to the Diseases of the Nervous System chapter (G00–G99) of ICD-10-CM.
Related codes in the G23 category
G23
Other degenerative diseases of basal ganglia
Non-billable
G23.0
Hallervorden-Spatz disease
Billable
G23.1
Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
Billable
G23.2
Striatonigral degeneration
Billable
G23.8
Other specified degenerative diseases of basal ganglia
Billable
G23.9
Degenerative disease of basal ganglia, unspecified
Billable
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