His areas of expertise include adrenalectomy (adrenal surgery), achalasia, and crohn's disease. Dr. Greenstein is an in-network provider for Amerigroup, POMCO, and Blue Cross/Blue Shield, as well as other insurance carriers. He obtained his medical school training at Weill Cornell Medical College and performed his residency at New York-Presbyterian Hospital and a hospital affiliated with Weill Cornell Medical College. He has received professional recognition including the following: Cum Laude with Distinction in the Major Yale University Surgical Residents Scholarship. Dr. Greenstein (or staff) speaks the following foreign languages: Spanish and French. He is affiliated with Mount Sinai Hospital. He is open to new patients.