What does the ICD9 code 443.9 mean?

Diagnosis code 443 in general terms is for "other peripheral vascular disease". With the addition of a 4th or 5th digit (if available), the diagosis becomes more and more specific. Diagnosis code 443.9 is for "peripheral vascular disease, unspecified". In this category is intermittent claudication NOS; spasm of artery--excluding atherosclerosis of the arteries of the extremities or a spasm of cerebral artery; and finally Peripheral: angiopathy NOS or vascular disease NOS.