Plaza Medical Group was founded in 1992 through the merger of the Cardiovascular Clinic and Northwest Internal Medicine Associates. It is one of the largest physician-owned and operated multispecialty medical groups that provide health care services to patients. Its specialties include cardiology, internal medicine, nephrology, endocrinology, gastroenterology and family practice. The organization offers a wide range of services, such as pain management, cardiac catheterization, percutaneous coronary intervention and cardiac perfusion scan. It also provides heart and lung transplant, and abdominal aneurysm, cartoid artery, heart valve, lung and vascular surgery. Plaza Medical Group is located in Oklahoma City.