Mary Anna Sanders, D.O. is the newest member of OBGYN Chattanooga TN - Center of Excellence. Dr. Sanders will begin seeing patients March 2016. You may schedule an appointment today at 423.629.9743. There comes a time in every woman’s life when excellence is expected. OBGYN Chattanooga TN - Center of Excellence makes a lifelong commitment to each patient. We excel in services to help women through each stage of life whether it is prevention, infertility, pregnancy, or menopause.