Steven Greenstein, MD

Greenstein, Steven, MD

Primary Location

Mount Sinai South Nassau
One Healthy Way
Oceanside, NY 11572
(516) 632-3672
(516) 336-5309

No Patient Experience Ratings [Why not?]



Area(s) of Practice Specialty

Cardiology, Emergency Medicine

Hospital Employed


Medical School

New York Medical College


Zucker School of Medicine at Hofstra/Northwell

Board Certification

American Board of Internal Medicine; American Board of Emergency Medicine

Accepted Insurance

Participates in most plans the hospital accepts.
Click here to view the list of Participating Insurance Plans.
Click here to view the list of Non-Participating Insurance Plans.

Accepting New Patients



Steven Greenstein, MD, is a triple board certified cardiologist. Dr. Greenstein earned his medical degree at Albert Einstein College of Medicine. He completed residencies in both emergency medicine and internal medicine at Kings County Hospital Center, where he also served as chief resident. He then went on to complete a fellowship in cardiovascular disease at Northwell Health. Dr. Greenstein continues to incorporate his training from emergency medicine into everyday practice, utilizing skills such as point of care ultrasound to maintain a focus on inpatient medicine and acute care cardiology.