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.
1 Below â diaphragm â the muscular organ that separates the chest cavity from abdomen [5].  Location of heart in the Mediastinum. Heart is located in a space in the centre of the chest cavity called mediastinum in particular theMiddle mediastinum. It is the space between the 2 lungs and the heart is wedged between them.