Medical Professionals . Medical Professionals. Continuing Medical Education; Contact Us; hCare - Electronic Health Records; Nursing at TriStar Health; ... MyHealthOne Patient Portal. TriStar Health / MyHealthONE Patient Portal; TriStar Health 1000 Health Park Dr. Ste. 500 Brentwood, TN 37027 Telephone: (800) 242-5662. Connect With Us..