Who are the best hospitals in cardiology and heart surgery for 2019-2020, according to the usnews.com rankings? The top of the Cardiac specialty list are Cleveland Clinic (Ohio) and Mayo Clinic (Rochester, MN). Top 50 hospitals ranked. See if there is one in your state. Rankings include survival ratings using Medicare data from 2015 to 2017. Hospitals ranked higher if they participated in public transparency reporting by the medical professional societies. Minimum volume of 1,931 Medicare cases over 3 years.