Areas of expertise for Dr. Hammer include HIV/AIDS. Dr. Hammer is affiliated with ColumbiaDoctors. He is in-network for Aetna EPO, POMCO, and Blue Cross/Blue Shield, as well as other insurance carriers. He has an open panel. Dr. Hammer studied medicine at Columbia University, College of Physicians and Surgeons. His training includes residency programs at New York-Presbyterian Hospital, Columbia University Medical Center, and Stanford University Medical Center. His distinctions include: New York Super Doctors; One of America's Top Doctors; and Board Certified In Infectious Disease Ewig Clinical Teaching Award.