ICD-10 · PDGM grouping
G23 Other degenerative diseases of basal ganglia
All 6 codes in the G23 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
6
Can lead a claim
6
Cannot lead a claim
0
What CMS assigns to G23
All 6 codes group to Neuro Rehabilitation. None of the 6 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in G23
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| G23.0 | Hallervorden-Spatz disease | Can lead a claim | B | None |
| G23.1 | Progressive supranuclear ophthalmoplegia [Steele-Richardson-Olszewski]CMS: Progressive supranuclear ophthalmoplegia | Can lead a claim | B | None |
| G23.2 | Striatonigral degeneration | Can lead a claim | B | None |
| G23.3 | Hypomyelination with atrophy of the basal ganglia and cerebellumCMS: Hypomyelination with atrophy of basal ganglia and cerebellum | Can lead a claim | B | None |
| G23.8 | Other specified degenerative diseases of basal ganglia | Can lead a claim | B | None |
| G23.9 | Degenerative disease of basal ganglia, unspecified | Can lead a claim | B | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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