Look up hospital ratings for cardiac surgery in your state, through the Society of Thoracic Surgeons (STS). Many hospitals voluntarily report their results, which are posted here for adult coronary artery bypass graft (CABG), valve replacement, congenital heart surgery and lobectomy for lung cancer. Most results cover the time period through June 2018. Most hospitals get two stars for “as expected” performance. Outstanding hospitals get 3 stars; under-performing hospitals get 1 star. Search by state or name of hospital to find the best. Excellent website. The Society of Thoracic Surgeons is a not-for-profit organization representing more than 7,600 surgeons and others dedicated to ensuring the best possible outcomes for surgeries of the heart, lungs, esophagus, and other surgical chest procedures.