The ICD-9 code range DISEASES OF VEINS AND LYMPHATICS, AND OTHER DISEASES OF CIRCULATORY SYSTEM for 451-459 is medical classification list by the World Health Organization (WHO).
Phlebitis and thrombophlebitis
Portal vein thrombosis
Other venous embolism and thrombosis
Varicose veins of lower extremities
Varicose veins of other sites
Noninfectious disorders of lymphatic channels
Other disorders of circulatory system