TRICARE Policy Manual 6010.60-M, April 1, 2015 Chapter 4 Section 12.1 Mediastinum And Diaphragm Issue Date: August 26, 1985 Authority: 32 CFR 199.4(c)(2) and (c)(3) Copyright: CPT only © 2006 American Medical Association (or such other date of publication of CPT). All Rights Reserved. Revision: 1.0 CPT PROCEDURE CODE RANGE39000 - 39599 2.0 DESCRIPTIONThe mediastinum involves the mass of tissues and organs separating the two lungs, between the sternum in front and the vertebral column behind, and from the thoracic inlet above to the diaphragm below. It contains the heart and its large vessels, the trachea, esophagus, thymus, lymph nodes, and other structures and tissues. The diaphragm involves the musculomembranous partition separating the abdominal and thoracic cavities, and serves as a major inspiratory muscle. 3.0 POLICYServices and supplies required in the diagnosis and treatment of illness or injury involving either the mediastinum or diaphragm are covered. - END -