His hospital/clinic affiliations include Banner - University Medical Center Phoenix, Banner Desert Medical Center, and Banner Thunderbird Medical Center. After attending the University of Hawaii at Manoa, John A. Burns School of Medicine, Dr. Gunatilake completed his residency training at Banner - University Medical Center Phoenix. He is in-network for Humana HMO, Humana Bronze, and Humana Catastrophic, in addition to other insurance carriers.