ICD-10 Code G23 – Other degenerative diseases of basal ganglia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G23 – Other degenerative diseases of basal ganglia
What it is
G23 identifies a group of degenerative disorders affecting the basal ganglia, which help control movement. Use it when the record documents a specific degenerative basal ganglia disease that is not classified elsewhere.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include progressive movement abnormalities such as rigidity, bradykinesia, tremor, dystonia, or gait disturbance.
When to use this code
Use G23 when the clinician documents a degenerative basal ganglia disorder and no more specific ICD-10-CM code applies. It is appropriate for confirmed diagnoses, not for nonspecific neurologic symptoms alone. If the exact disorder is named in the chart, code that condition instead.
Do not use for
Do not use this code for Parkinson disease, Huntington disease, or other separately classified movement disorders. Do not assign it when documentation only states tremor, stiffness, or abnormal gait without a confirmed degenerative basal ganglia diagnosis.
Coding tip
Check the provider’s exact wording and code the most specific documented diagnosis available.