Dr. Robert J. Marshall is a cardiologist in Bethesda, Maryland and is affiliated with multiple hospitals in the area, including George Washington University Hospital and Johns Hopkins Medicine-Suburban Hospital. He received his medical degree from Case Western Reserve University School of Medicine and has been in practice for more than 20 years. Dr. Robert J. Marshall has expertise in treating coronary artery disease, heart failure, hypertension & high blood pressure, among other conditions - see all areas of expertise. Dr. Robert J. Marshall accepts Medicare, Aetna, Humana, Cigna, Blue Cross, United Healthcare - see other insurance plans accepted.