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.
The myocardium, or cardiac muscle, is the thickest section of the heart wall and contains cardiomyocytes, which are the contractile cells of the heart. As type of muscle tissue, the myocardium is unique and distinct compared to all other muscle tissues in the human body.