Patient Portal; Mobile App; Pay My Bill; Proudly part of . Northern Virginia Endocrinologists ... Dr. Rogacz. 3201 Jermantown Rd Suite 250 Fairfax, VA 22030. ... We are a four doctor practice located in Fairfax, VA, specializing in endocrinology, diabetes, and metabolism. Come visit our office today or book an appointment online!Fairfax Endocrinologists‧Roy Langley.