I66
Header — not billableOcclusion and stenosis of cerebral arteries, not resulting in cerebral infarction
The ICD-10 code for occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction is I66.
I66 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 6 more specific codes below.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
Includes
Terms listed here further define or give examples of the conditions grouped under this code — they describe what the code covers, not a separate diagnosis.
- embolism of cerebral artery
- narrowing of cerebral artery
- obstruction (complete) (partial) of cerebral artery
- thrombosis of cerebral artery
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under I66
- I66.0Occlusion and stenosis of middle cerebral arterynon-billable header
- I66.1Occlusion and stenosis of anterior cerebral arterynon-billable header
- I66.2Occlusion and stenosis of posterior cerebral arterynon-billable header
- I66.3Occlusion and stenosis of cerebellar arteries
- I66.8Occlusion and stenosis of other cerebral arteries
- I66.9Occlusion and stenosis of unspecified cerebral artery
Related codes in this category
- I60Nontraumatic subarachnoid hemorrhagenon-billable header
- I61Nontraumatic intracerebral hemorrhagenon-billable header
- I62Other and unspecified nontraumatic intracranial hemorrhagenon-billable header
- I63Cerebral infarctionnon-billable header
- I65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarctionnon-billable header
- I67Other cerebrovascular diseasesnon-billable header
- I68Cerebrovascular disorders in diseases classified elsewherenon-billable header
- I69Sequelae of cerebrovascular diseasenon-billable header
- I66Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarctionnon-billable header