ICD-10 · PDGM grouping
I65 Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
All 11 codes in the I65 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
11
Can lead a claim
11
Cannot lead a claim
0
What CMS assigns to I65
All 11 codes group to Neuro Rehabilitation. 8 of the 11 count toward the Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction comorbidity subgroup; 3 are assigned none. Every code can lead a claim.
- Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction
Every code in I65
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 |
|---|---|---|---|---|
| I65.0 Occlusion and stenosis of vertebral artery | ||||
| I65.01 | Occlusion and stenosis of right vertebral artery | Can lead a claim | B | Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction |
| I65.02 | Occlusion and stenosis of left vertebral artery | Can lead a claim | B | Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction |
| I65.03 | Occlusion and stenosis of bilateral vertebral arteries | Can lead a claim | B | Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction |
| I65.09 | Occlusion and stenosis of unspecified vertebral artery | Can lead a claim | B | None |
| I65.1 | Occlusion and stenosis of basilar artery | Can lead a claim | B | None |
| I65.2 Occlusion and stenosis of carotid artery | ||||
| I65.21 | Occlusion and stenosis of right carotid artery | Can lead a claim | B | Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction |
| I65.22 | Occlusion and stenosis of left carotid artery | Can lead a claim | B | Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction |
| I65.23 | Occlusion and stenosis of bilateral carotid arteries | Can lead a claim | B | Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction |
| I65.29 | Occlusion and stenosis of unspecified carotid artery | Can lead a claim | B | None |
| I65.8 | Occlusion and stenosis of other precerebral arteries | Can lead a claim | B | Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction |
| I65.9 | Occlusion and stenosis of unspecified precerebral artery | Can lead a claim | B | Occlusion/Stenosis of Pre-cerebral/Cerebral Arteries w/o Cerebral Infarction |
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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