Medical City Plano Patient Portal. Colonoscopy Doctor Dallas, Plano TX Dr; Health (8 days ago) Existing patients please access the patient portal login to request an appointment; 15th Street, Suite 280 Plano, Texas 75093 Phone: (972) 985-7988 Fax: (866) 644-6805 .PATIENT REVIEWS; This was the best doctor I've ever been to.