ICD-9 code 433.90 for Occlusion and stenosis of unspecified precerebral artery without cerebral infarction is a medical classification as listed by WHO under the range -CEREBROVASCULAR DISEASE (430-438).
Precerebral artery NOS
The following fifth-digit subclassification is for use with category 433:
0 without mention of cerebral infarction
1 with cerebral infarction
Includes: embolism of basilar, carotid, and vertebral arteries
narrowing of basilar, carotid, and vertebral arteries
obstruction of basilar, carotid, and vertebral arteries
thrombosis of basilar, carotid, and vertebral arteries
Excludes: insufficiency NOS of precerebral arteries (435.0-435.9)
Use additional code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (V45.88)
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