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 for Students. 1  1 : one of the blood vessels that carry the blood back to the heart. 2  2 : a long narrow opening in rock filled with a specific mineral a vein of gold. 3  3 : a streak of different color or texture (as in marble) 4  4 : a style of expression I continued in a more serious vein.