24-Hour Emergency Care for Our Community

Mercy Hospital's Emergency Department in Rockville Centre, NY, is open 24-hours a day, seven days a week to help Long Islanders with emergent medical issues.

Emergency staff members are trained to treat all medical conditions, illnesses and injuries. They use advanced diagnostic imaging and consult with Mercy Hospital's specialists in multiple disciplines. Our goal is to provide rapid diagnosis and immediate care.

Call 9-1-1 immediately if you are experiencing a medical emergency.

Emergency Services

Our highly experienced and compassionate team of board-certified emergency medicine physicians, registered nurses, radiologists and additional support staff treat a range of injuries and conditions, including:

  • Heart attack
  • Head injuries
  • Orthopedic injuries
  • Pediatric injuries
  • Respiratory distress
  • Stroke

Mercy Hospital has earned Level 3 Geriatric Emergency Department Accreditation (GEDA), providing elderly patients who visit our emergency department with the necessary expertise, equipment and resources to deliver optimal care.

Primary Stroke Center

Mercy Hospital is a New York State Department of Health-designated Primary Stroke Center and certified by the New York State Joint Commission. The hospital has received the 2022 American Heart Association/American Stroke Association’s Get With The Guidelines®-Gold Plus Quality Achievement Award as well as the Target: Stroke Honor Roll Elite Award.

View stroke care services


Heart & Vascular Care

Our St. Francis Heart Center offers the most advanced cardiac catheterization services.

View interventional cardiology services

American Medical Response

Catholic Health and American Medical Response work together to offer medical transportation services to our patients. Call for an ambulance at any time.



Paramedic-level ambulance service is available for Catholic Health patients at home, care facilities or physician offices needing urgent access to a Catholic Health hospital emergency department.

American Medical Response's 24/7 Care in Motion Transfer Center is equipped with software to facilitate single-call communication with Catholic Health providers requesting medical transportation.

Inside of Hunter EMS ambulance