G23 ICD-10-CA category: Other degenerative diseases of basal ganglia
G23 isn’t a code on its own. Choose one of the 6 codes beneath it, the one the documentation supports.
Official description
G23Other degenerative diseases of basal ganglia
ICD-10-CA · Canada
Codes in G23
G23 isn’t a code on its own. Open the code that matches what the note documents.
G23.0Hallervorden-Spatz diseaseG23.1Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]G23.2Multiple system atrophy, parkinsonian type [MSA-P]G23.3Multiple system atrophy, cerebellar type [MSA-C]G23.8Other specified degenerative diseases of basal gangliaG23.9Degenerative disease of basal ganglia, unspecifiedNotes for G23
As CIHI prints them, with any note G23 takes from the headings above it.
Excludes
Conditions classified elsewhere.
- Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 6: Diseases of the nervous system (G00-G99)
Where G23 sits
- 1ChapterChapter 6: Diseases of the nervous system (G00-G99)
- 2Block G20-G26Extrapyramidal and movement disorders
- 3Category G23Other degenerative diseases of basal ganglia
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is G23 a valid ICD-10-CA code?
No. G23 (Other degenerative diseases of basal ganglia) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 6 codes; record the one the documentation supports.
Where is G23 in ICD-10-CA?
G23 sits under G20-G26 Extrapyramidal and movement disorders, within Chapter 6: Diseases of the nervous system (G00-G99).
What coding notes apply to G23?
ICD-10-CA lists Excludes notes for G23, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.