I66.1

Occlusion and stenosis of anterior cerebral artery

Non-billable header

I66.1 is a non-billable header code. Use one of the more specific codes below.

Inclusion terms

Includes (from I66)

  • 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.-) (from I66)
  • Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5) (from I66)

Excludes2

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

  • certain conditions originating in the perinatal period (P04-P96) (from I66)
  • certain infectious and parasitic diseases (A00-B99) (from I66)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A) (from I66)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99) (from I66)
  • endocrine, nutritional and metabolic diseases (E00-E88) (from I66)
  • injury, poisoning and certain other consequences of external causes (S00-T88) (from I66)
  • neoplasms (C00-D49) (from I66)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94) (from I66)
  • systemic connective tissue disorders (M30-M36) (from I66)
  • transient cerebral ischemic attacks and related syndromes (G45.-) (from I66)

Use additional code

Add a code to identify the following, if applicable.

  • code to identify presence of: (from I66)
  • alcohol abuse and dependence (F10.-) (from I66)
  • exposure to environmental tobacco smoke (Z77.22) (from I66)
  • history of tobacco dependence (Z87.891) (from I66)
  • hypertension (I10-I1A) (from I66)
  • occupational exposure to environmental tobacco smoke (Z57.31) (from I66)
  • tobacco dependence (F17.-) (from I66)
  • tobacco use (Z72.0) (from I66)

Also known as

  • Occlusion, occluded, artery, cerebral, anterior

Parent code

  • I66Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarctionHeader

More specific codes I66.1

  • I66.11Occlusion and stenosis of right anterior cerebral arteryBillable
  • I66.12Occlusion and stenosis of left anterior cerebral arteryBillable
  • I66.13Occlusion and stenosis of bilateral anterior cerebral arteriesBillable
  • I66.19Occlusion and stenosis of unspecified anterior cerebral arteryBillable

Related codes

  • I66.0Occlusion and stenosis of middle 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

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