Patient Forms; Patient Portal; Contact Us; ... 972-943-5914 4100 W. 15th Street, Suite 202, Plano, TX 75093 Request Appointment. DR. LEO JENG. Leo Jeng, M.D. is board certified in endocrinology and metabolism. ... dyslipidemia, osteoporosis, thyroid disorders and diabetes. Dr. Jeng grew up in Norcross, Georgia. After graduating from Stanford ....