Lone Star OB/GYN Associates offers comprehensive, wide-ranging OB/GYN services in San Antonio, TX. From gynecological exams to pregnancy to menopause care, we're here for every woman of every age. ... PATIENT PORTAL Lone Star OB/GYN Associates. Address: Medical Center Tower I. 7950 Floyd Curl Dr. Suites 300 & 400. San Antonio, TX 78229. Phone ....