Moises Siperstein, M.D. Patient Portal. Our Patient Portal provides a quick access to our practice and is conveniently and securely available 24/7. Portal messages are monitored daily and are responded within 24 hours, bypassing the need for Voicemail messages and telephone tag!Adult Medicine Port St. Lucie FL‧Contact Us‧Patient Education‧Services‧Map and Directions‧Office Hours.