I66

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

Non-billable header

I66 is a non-billable header code. Use one of the more specific codes below.

Inclusion terms

Includes

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

Excludes1

Not coded here — never report together with this code.

  • traumatic intracranial hemorrhage (S06.-)
  • Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)

Excludes2

Not included here — may be reported together when both conditions exist.

  • 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.-)

Use additional code

Add a code to identify the following, if applicable.

  • 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)

More specific codes I66

  • I66.0Occlusion and stenosis of middle cerebral arteryHeader
  • I66.1Occlusion and stenosis of anterior cerebral arteryHeader
  • I66.2Occlusion and stenosis of posterior cerebral arteryHeader
  • I66.3Occlusion and stenosis of cerebellar arteriesBillable
  • I66.8Occlusion and stenosis of other cerebral arteriesBillable
  • I66.9Occlusion and stenosis of unspecified cerebral arteryBillable

Related codes

  • I60Nontraumatic subarachnoid hemorrhageHeader
  • I61Nontraumatic intracerebral hemorrhageHeader
  • I62Other and unspecified nontraumatic intracranial hemorrhageHeader
  • I63Cerebral infarctionHeader
  • I65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarctionHeader
  • I67Other cerebrovascular diseasesHeader
  • I68Cerebrovascular disorders in diseases classified elsewhereHeader
  • I69Sequelae of cerebrovascular diseaseHeader

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