Use additional 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)

Excludes1

  • traumatic intracranial hemorrhage (S06.-)
  1. I66 Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction

    Includes:

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

    Excludes1

    • Occlusion and stenosis of cerebral artery causing cerebral infarction (I63.3-I63.5)
    1. I66.0 Occlusion and stenosis of middle cerebral artery

      1. I66.01 Occlusion and stenosis of right middle cerebral artery

      2. I66.02 Occlusion and stenosis of left middle cerebral artery

      3. I66.03 Occlusion and stenosis of bilateral middle cerebral arteries

      4. I66.09 Occlusion and stenosis of unspecified middle cerebral artery

    2. I66.1 Occlusion and stenosis of anterior cerebral artery

      1. I66.11 Occlusion and stenosis of right anterior cerebral artery

      2. I66.12 Occlusion and stenosis of left anterior cerebral artery

      3. I66.13 Occlusion and stenosis of bilateral anterior cerebral arteries

      4. I66.19 Occlusion and stenosis of unspecified anterior cerebral artery

    3. I66.2 Occlusion and stenosis of posterior cerebral artery

      1. I66.21 Occlusion and stenosis of right posterior cerebral artery

      2. I66.22 Occlusion and stenosis of left posterior cerebral artery

      3. I66.23 Occlusion and stenosis of bilateral posterior cerebral arteries

      4. I66.29 Occlusion and stenosis of unspecified posterior cerebral artery

    4. I66.3 Occlusion and stenosis of cerebellar arteries

    5. I66.8 Occlusion and stenosis of other cerebral arteries

      Inclusion term(s):

      • Occlusion and stenosis of perforating arteries
    6. I66.9 Occlusion and stenosis of unspecified cerebral artery

Abbreviations used here:

NEC Not elsewhere classifiable
This abbreviation in the Tabular List represents “other specified”. When a specific code is not available for a condition, the Tabular List includes an NEC entry under a code to identify the code as the “other specified” code.

NOS Not otherwise specified
This abbreviation is the equivalent of unspecified.