U.S. ICD-10-CM reference · FY2027
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I66Category · further specificity requiredCurrent

Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction

HierarchyI60-I69 · I66

Code-level instructions

Includes
  • embolism of cerebral artery
  • narrowing of cerebral artery
  • obstruction (complete) (partial) of cerebral artery
  • thrombosis of cerebral artery
Excludes 1

Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)

Inherited instructions

I60-I69 · Cerebrovascular diseases (I60-I69)

Excludes 1

traumatic intracranial hemorrhage (S06.-)

Use additional code
  • code to identify presence of:
  • alcohol abuse and dependence (F10.-)
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • hypertension (I10-I1A)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Chapters 9 · Diseases of the circulatory system (I00-I99)

Excludes 2
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

More specific codes

I66.0Occlusion and stenosis of middle cerebral arteryCategory · further specificity requiredI66.1Occlusion and stenosis of anterior cerebral arteryCategory · further specificity requiredI66.2Occlusion and stenosis of posterior cerebral arteryCategory · further specificity requiredI66.3Occlusion and stenosis of cerebellar arteriesBillable / specificI66.8Occlusion and stenosis of other cerebral arteriesBillable / specificI66.9Occlusion and stenosis of unspecified cerebral arteryBillable / specific
Code edition