Best Places to Work in Healthcare - 2019 2018 Service Awards Banquet All <Prev Next> Rank 53 - Provider/Insurer Oklahoma Heart Institute Provider/Insurer, Tulsa , OK Tweet Share Share Email More Years on the list: 1 Number of U.S. employees: 308 Voluntary employee turnover: 14% What employees love: Rounding by senior leadership; flexible schedules; school supply drive