G23 - Other degenerative diseases of basal ganglia
Excludes 2:
-multi-system degeneration of the autonomic nervous system G90.3)
G23.0 - Hallervorden-Spatz disease
G23.1 - Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]
G23.2 - Striatonigral degeneration
G23.8 - Other specified degenerative diseases of basal ganglia
G23.9 - Degenerative disease of basal ganglia, unspecified