Founded in 1928, Mount Sinai South Nassau is a 455-bed, acute-care, not-for-profit teaching hospital. Located in Oceanside, New York, we serve the South Shore of Nassau County on Long Island, from the Rockaways in Queens to the Massapequa area and beyond. You and your loved ones receive high quality, compassionate care on our main campus in Oceanside as well as on our satellite facilities.

We are committed to providing excellent health care and have been widely recognized for service excellence, including the following:  

• Earned 10 U.S. News & World Report “high performing” ratings for procedures and conditions including diabetes; hip fracture; kidney failure; pneumonia; chronic obstructive pulmonary disease; colon surgery; heart attack; heart failure; maternity; and leukemia, lymphoma, and myeloma
• Named one of Healthgrades America's 100 Best Hospitals and a Five-Star Recipient for Coronary Intervention, while also being recognized with the Coronary Intervention Excellence Award by Healthgrades.
• Received the Healthgrades Orthopedic Surgery Excellence award for 10 years in a row (2015-2024). Also named among the top 10 percent in the nation for overall orthopedic services for 10 years in a row (2015-2024)
• Received the Joint Commission Perinatal Care Certification (first Long Island hospital to earn Joint Commission Certification)
• Honored for top nursing care by the American Nurses Credentialing Center’s Magnet® Recognition Program
• Awarded the prestigious 2024 Lantern Award by the Emergency Nurses Association for reducing wait times and demonstrating commitment to exceptional and innovative performance in leadership, practice, education, advocacy, and research in the emergency department
• Earned the American College of Surgeons verification as a Level II Trauma Center. We remain the only one on Nassau County’s South Shore.
• Designated as an Infectious Diseases Society of America Antimicrobial Stewardship Center of Excellence