Suite 124. San Antonio, TX 78249. Hours: Mon - Fri: 8:00am - 5:00pm. St. David's Medical Center (866) 391-2021. St. David's North Austin Medical Center (866) 391-2015. St. David's South Austin Medical Center (866) 391-2018. St. David's Round Rock Medical Center (866) 391-2017. St. David's Georgetown Hospital (866) 396-1025. Heart Hospital of ....