Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction (I65) ICD-10-CM
The I65 code range covers occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction with 14 ICD-10-CM diagnosis codes. 11 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- embolism of precerebral artery
- narrowing of precerebral artery
- obstruction (complete) (partial) of precerebral artery
- thrombosis of precerebral artery
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the I65 Range 14 codes · 11 billable
- I65 Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarctionNon-billable
- I65.0 Occlusion and stenosis of vertebral arteryNon-billable
- I65.01 Occlusion and stenosis of right vertebral artery
- I65.02 Occlusion and stenosis of left vertebral artery
- I65.03 Occlusion and stenosis of bilateral vertebral arteries
- I65.09 Occlusion and stenosis of unspecified vertebral artery
- I65.1 Occlusion and stenosis of basilar artery
- I65.2 Occlusion and stenosis of carotid arteryNon-billable
- I65.21 Occlusion and stenosis of right carotid artery
- I65.22 Occlusion and stenosis of left carotid artery
- I65.23 Occlusion and stenosis of bilateral carotid arteries
- I65.29 Occlusion and stenosis of unspecified carotid artery
- I65.8 Occlusion and stenosis of other precerebral arteries
- I65.9 Occlusion and stenosis of unspecified precerebral artery
About the I65 Code Range
These codes describe blocked or narrowed arteries leading to the brain when no brain tissue death results.
I65 separates the arteries by name: vertebral I65.0, basilar I65.1, and carotid I65.2. The vertebral and carotid branches distinguish right, left, both sides, or an unspecified artery. Separate codes identify other precerebral arteries I65.8 and an unspecified precerebral artery I65.9.
Questions About This Page
How many billable codes are in the I65 range?
Of the 14 codes in this range, 11 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the I65 range classify?
The range classifies occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
