Login to the Patient Portal to pay your bill online. PrEP. More Information. Click here. ... Lone Star Circle of Care OB/GYN at MoPac North. Back to Results. 1/14. Services at this location. Obstetrics & Gynecology; Contact. 12201 Renfert Way Suite 220 Austin, TX 78758. Get Directions. Phone: 512-836-2536. Fax: 512-623-7319. Hours: Monday ....