History of Mount Sinai South Nassau
Mount Sinai South Nassau has been serving Long Island’s South Shore community since 1928. We began as South Nassau Community Hospital. Mary Pearson, the hospital’s first administrator, and an organizing committee of 24 raised $250,000 to make the hospital a reality. Construction began on November 16, 1927. The cornerstone ceremony took place about six months later, on May 6, 1928. We proudly opened our doors on November 12, 1928. At that point, we boasted 50 beds. In the first year, we admitted 81 patients and 18 babies were born. And we continued to grow.
2011-Present
2014 South Nassau Communities Hospital purchased the assets of Long Beach Medical Center, which had closed following Superstorm Sandy two years prior.
2015 Opened an emergency room at Long Beach with regulatory approval to restore around-the-clock emergency medical care. Also opened a 23-bed medical/surgical unit and a 20-bed transitional care unit.
2018 Joined the Mount Sinai Health System, the health systems’ first hospital outside of New York City.
2017 Cardiac Rehabilitation Center opens.
2019 Changes name to Mount Sinai South Nassau.
2023 Instituted electronic health records.
2025 Opened an expanded ER, big enough to accommodate approximately 75,000 patients annually. Also opened a level 2 trauma center.
2000-2010
2001 Opened the Center for Bariatric Surgery.
2002 Opened the Cancer Center in Valley Stream as well as Long Island’s first Gamma Knife®, which we use to treat brain metastases and other benign brain conditions.
2005 Opened the Center for Advanced Orthopedics, specializing in minimally invasive and arthroscopic surgery for knees, hips, shoulders, and spine.
2006 Completed a four-story wing with a maternity suite (26 private beds), a Level II neonatal intensive care unit, and a 36-bed inpatient behavioral health unit.
2006 Added more beds, bringing us to 435 beds.
2008 Opened the Center for Cardiovascular Health to treat coronary and peripheral arterial angioplasty.
2009 Launched the interventional radiology center as well as a 6,000-sq. ft. Center for Ambulatory Surgery.
2010 Added a Novalis Tx™ radiosurgery device to treat many types of cancer, including prostate, liver, spine, and lung. Also acquired a da Vinci Robotic Surgical System for minimally invasive robotic procedures.
1971-1999
1971 Established a relationship with the State University of New York at Stony Brook’s medical school.
1984 Bed capacity increases to 429.
1988 Catheterization laboratory opens.
1990s Angiography Unit, Diabetes Education Center, and Wound Care Center open.
1997 Carlos R. Galeon Stem Cell Unit opens.
1940-1970
1940 Added a new wing, almost doubling bed capacity to 98. Also used penicillin to treat pneumonia for the first time on Long Island.
1941 Opened five operating suites.
1953 Expanded the surgical suite to five rooms.
1956 Added 132 beds, bringing us up to 230. Also added a maternity ward as well as a laboratory and radiology department.
1966 A new wing increased the number of beds to 320. Also opened a coronary unit and an advanced emergency department.
1969 Opened an arthritis clinic and a mental health clinic.