Leo Toupin MD PA. Capital Primary Care 12335 Hymeadow Drive Suite 150 Austin, TX 78750 (512) 977-8300 Fax (512) 977-8301 Portal Information. ... Go to the patient portal and enter the 5 digit PIN provided along with your primary phone number and birth date.Office Policies‧About US‧Links‧Contact US‧Directions.