2006 ICD-9-CM Volume 1 Diagnosis Codes > Diseases Of The Circulatory System 390-459 > Diseases Of Veins And Lymphatics, And Other Diseases Of Circulatory System 451-459 > 451 Phlebitis and thrombophlebitis 452 Portal vein thrombosis 453 Other venous embolism and thrombosis 454 Varicose veins of lower extremities 455 Hemorrhoids 456 Varicose veins of other sites 457 Noninfectious disorders of lymphatic channels 458 Hypotension 459 Other disorders of circulatory system