Mercy Medical Group - Cardiology is a cardiology center that offers many services, including cardiology, electrocardiogram (ekg), and cardiovascular surgery. Visit Mercy Medical Group - Cardiology located at 3941 J St, Sacramento, CA. This Sacramento cardiology center is one of the best in California. As part of the Dignity Health network, Mercy Medical Group - Cardiology is dedicated to delivering high quality, compassionate care and access to Sacramento and nearby communities.