ICD10BillableValid for clinical use
ICD-10 Code G23.9: Degenerative disease of basal ganglia, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).
When is it used?
- May be used when a clinician documents degenerative disease of basal ganglia, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
6Diseases of the nervous system (G00-G99)
block
G20-G26Extrapyramidal and movement disorders
category
G23Other degenerative diseases of basal ganglia
currentG23
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
NeurologistGeneral Physician
Related codes
Sibling codes
G23.0Hallervorden-Spatz diseasebillableG23.1Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]billableG23.2Striatonigral degenerationbillableG23.3Hypomyelination with atrophy of the basal ganglia and cerebellumbillableG23.8Other specified degenerative diseases of basal gangliabillable
Coverage-related procedures and services
CPT 92651high
AUDITORY EVOKED POTENTIALS; FOR HEARING STATUS DETERMINATION, BROADBAND STIMULI, WITH INTERPRETATION AND REPORT
Source: CMS coverage guidance
CPT 92652high
AUDITORY EVOKED POTENTIALS; FOR THRESHOLD ESTIMATION AT MULTIPLE FREQUENCIES, WITH INTERPRETATION AND REPORT
Source: CMS coverage guidance
CPT 92653high
AUDITORY EVOKED POTENTIALS; NEURODIAGNOSTIC, WITH INTERPRETATION AND REPORT
Source: CMS coverage guidance
CPT 70460high
COMPUTED TOMOGRAPHY, HEAD OR BRAIN; WITH CONTRAST MATERIAL(S)
Source: CMS coverage guidance
CPT 70450high
COMPUTED TOMOGRAPHY, HEAD OR BRAIN; WITHOUT CONTRAST MATERIAL
Source: CMS coverage guidance
CPT 70470high
COMPUTED TOMOGRAPHY, HEAD OR BRAIN; WITHOUT CONTRAST MATERIAL, FOLLOWED BY CONTRAST MATERIAL(S) AND FURTHER SECTIONS
Source: CMS coverage guidance
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
G23.9
Common synonyms
Degenerative disease of basal ganglia, unspecifiedDegenerative disease of basal ganglia
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.