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Please call 9-1-1 if this is a medical emergency.Or, something else? voice to text I’m Listening Search Search Services & Care Our team of experts offer comprehensive care to meet the unique health needs of each patient. Explore our services Community Health We offer wellness events, classes and free health screenings. View our community programs For Patients & Visitors Helpful information to make your hospital visit easier. View patients and visitors information Featured News Previous Slide Next Slide Catholic Health Opens Second Root & Sprig Restaurant at St. Catherine of Siena Hospital Healthy eating options at new fast-casual restaurant. Specialized Care for Special Wounds George Marchelos needed three amputations on his left foot due to an infection resulting from diabetes. A Journey Toward Healing With Hyperbaric Oxygen Therapy Dawn Nilsson received hyperbaric oxygen (HBO) therapy for radiation proctitis Radiation Cystitis Healed With Pressurized Oxygen John Murphy underwent treatment at Center for Hyperbaric Medicine & Wound Healing at St. Charles Hospital for his radiation cystitis Living the Mission: Teresa Small Teresa Small is a Dietetic Supervisor at St. Catherine of Siena Hospital. Back On Top After Breast Cancer Diagnosis Nancy Hilsenbeck of Oakdale, NY, knows the importance of routine breast cancer screenings. St. Catherine of Siena Hospital Appoints New President Declan Doyle, MBA, has been named President at Catholic Health’s St. Catherine of Siena Hospital. View All News Upcoming Events May 13 Event Date 6:00 pm - 7:30 pm Learn to be... Tobacco-free program May 14 Event Date 5:00 pm - 7:00 pm Boardwalk to Wellness May 15 Event Date 1:00 pm - 2:00 pm Osteoporosis in Men and Women May 16 Event Date 1:00 pm - 2:00 pm Stroke Support Group May 21 Event Date 5:00 pm - 7:00 pm Boardwalk to Wellness May 22 Event Date 7:00 pm - 7:45 pm St. Catherine of Siena Bariatric Surgery Support Group - May 22 Previous Slide Next Slide View All Events Close Overlay Browser Error Diagnosis: Our website no longer supports this web browser. Treatment: Please use one of the following browsers for the best possible outcome. Edge Chrome Safari Firefox Trending Now Chest pain center rapidly diagnoses heart attacks Root & Sprig offers healthy eating options View wound care servicesFor Patients & Visitors Our Services Community Health Appointments Find a Doctor Careers 631-862-3000 50 NY-25A Smithtown, NY 11787 Footer Website Privacy Policy Legal Disclaimer Patient Privacy/HIPAA Rights Patient Rights...