1 ICD-9-CM 438.9 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 438.9 should only be used for claims with a date of service on or before September 30, 2015.
1. vein-a blood vessel that carries blood from the capillaries toward the heart; all veins except the pulmonary vein carry unaerated blood. vena, venous blood vessel. accessory cephalic vein, vena cephalica accessoria-a vein that passes along the radial edge of the forearm and joins the cephalic vein near the elbow.
Definition of vein. 1  1 : blood vessel; especially : any of the tubular branching vessels that carry blood from the capillaries toward the heart. 2  2a : any of the vascular bundles forming the framework of a leafb : any of the thickened cuticular ribs that serve to stiffen the wings of an insect.