433 Occlusion and stenosis of precerebral arteries
Codes starting 433 are the codes used for Vertebral, Carotid, and Basilar arteries. If it is just stenosis, use 433.20, but , with infarction use 433.21. Use 433.21 for vertebral artery infarction.
0 is without mention of cerebral infarction.
1 with cerebral infarction. See "Ingenix"
433.10 for Carotid, 433.00, Basilar for "without mention of cerebral infaction.
Thanks,
Annette