G23

Other degenerative diseases of basal ganglia

FY2027Chapter 6: Diseases of the nervous system/G20–G26 Extrapyramidal and movement disorders

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

Excludes2

G23 is a non-billable ICD-10-CM code category for other degenerative diseases of basal ganglia. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are G23.0 Hallervorden-Spatz disease, G23.1 Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski], G23.2 Striatonigral degeneration, G23.3 Hypomyelination with atrophy of the basal ganglia and cerebellum and 2 more. Its coding notes include 9 Excludes2 entries.

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code

multi-system degeneration of the autonomic nervous system (G90.3)

Also from chapter/block level (8 notes)

Inherited from Chapter 6 Diseases of the nervous system

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

More specific codes under G23 6