ICD-10 · PDGM grouping
G30-G32 — Other degenerative diseases of the nervous system
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.2.26.
Codes in range
21
No clinical group
4
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
17 of the 21 codes in G30-G32 group to Neuro Rehabilitation. A further 4 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Code families in G30-G32
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
Every code in G30-G32
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| G300 | Alzheimer's disease with early onset | B | Can lead a claim |
| G301 | Alzheimer's disease with late onset | B | Can lead a claim |
| G308 | Other Alzheimer's disease | B | Can lead a claim |
| G309 | Alzheimer's disease, unspecified | B | Can lead a claim |
| G3101 | Pick's disease | B | Can lead a claim |
| G3109 | Other frontotemporal neurocognitive disorder | B | Can lead a claim |
| G311 | Senile degeneration of brain, not elsewhere classified | B | Can lead a claim |
| G312 | Degeneration of nervous system due to alcohol | B | Can lead a claim |
| G3180 | Leukodystrophy, unspecified | B | Can lead a claim |
| G3181 | Alpers disease | B | Can lead a claim |
| G3182 | Leigh's disease | B | Can lead a claim |
| G3183 | Neurocognitive disorder with Lewy bodies | B | Can lead a claim |
| G3184 | Mild cognitive impairment of uncertain or unknown etiology | B | Can lead a claim |
| G3185 | Corticobasal degeneration | B | Can lead a claim |
| G3186 | Alexander disease | B | Can lead a claim |
| G3187 | Primary progressive apraxia of speech | B | Can lead a claim |
| G3189 | Other specified degenerative diseases of nervous system | B | Can lead a claim |
| G319 | Degenerative disease of nervous system, unspecified | None | Cannot lead a claim |
| G320 | Subac comb degeneration of spinal cord in dis classd elswhr | None | Cannot lead a claim |
| G3281 | Cerebellar ataxia in diseases classified elsewhere | None | Cannot lead a claim |
| G3289 | Oth degeneratv disord of nervous sys in dis classd elswhr | None | Cannot lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. 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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