If you do not have a patient portal account or you are having problems with your account, please call our office at (469) 364-3760. Facebook Twitter YouTube RSS. North Dallas OBGYN Office Visit our office in Dallas, TX. Tricia Shimer, M.D., P.A. 8160 Walnut Hill Ln Suite LL001 Dallas, TX 75231 Phone: (469) 364-3760.