At Texas Dermatology Associates, we are here to serve you. We accept Medicare as well as most common insurance plans. ... Patient Portal Login. LOG INTO OUR SECURE PATIENT PORTAL. Request An Appointment. ... Dallas 3900 Junius St., Suite 145 Dallas, TX 75246 Phone: 972-386-7546 Fax: 972-661-3255. Mansfield 1830 E. Broad St., Suite 102.