1 ICD-9-CM 751.7 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 751.7 should only be used for claims with a date of service on or before September 30, 2015. 2  For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
The myocardium is located between the endocardium and the visceral layer of the serous membrane (epicardium) of the heart.
Summary Information: Endocardium. Endocardium: The endocardium is a smooth membrane that lines the inside of the chambers of the heart and the valves of the heart. It lies beneath the myocardium. The endocardium includes endothelial cells, smooth muscle cells, elastin, and collagen fibers.ndocardium: The endocardium is a smooth membrane that lines the inside of the chambers of the heart and the valves of the heart.