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 heart is located in the thoracic cavity, in the portion of the chest known as the mediastenum-the region between the pleural sacs and containing all the thoracic viscera except the lungs.The pericardium is the thin sac or membrane which contains the heart and the roots of the great blood vessels.hen you refer to a body cavity, you would say the heart lies in the thorax or thoracic cavity. Within that cavity, it lies within the mediastenum, and is surrounded by the pericardium.