For over 40 years, Mount Sinai South Nassau has been where our Oceanside neighbors and families across Long Island turn for medical care. Not because we have the most advanced technology—though we do. Not because our surgeons perform complex procedures others can’t—though they do that too. People come to us because here, medicine still feels personal.
Located just off the LIRR line with easy access from Nassau County and Queens, our hospital was built by this community, for this community. Every patient who walks through our doors is someone we recognize—a small business owner from Rockville Centre, a young family from Baldwin, a retired teacher from Long Beach. And we treat every one of them like family.
What Guides Us, Every Day
Vision: To bring together the most advanced medicine and genuine human kindness—without making patients choose between the two.
Mission: Great healthcare shouldn’t require a medical degree to understand or a second mortgage to afford. We’re here to make world-class treatment accessible, clear, and compassionate.
Our Promise: We do what’s right, even when no one is watching. We listen before we diagnose. We collaborate across specialties because your health doesn’t fit into neat categories. And we never stop asking: How can we do this better for our patients?
A Place Designed for Healing
If you’ve visited us recently, you may have noticed changes. Our surgical suites now feature advanced laminar airflow systems—the same infection-control standards used in top academic centers. Our ICUs were redesigned with input from critical care nurses who know that natural light and reduced noise actually help patients heal faster.
But some things haven’t changed. Our emergency department still operates 24/7, staffed by board-certified physicians who chose emergency medicine because they thrive under pressure. Our pathology lab still runs automated tests around the clock. And our transport team—paramedics who know every back road in Nassau County—is ready when you need them.
When You Need a Specialist, Not Just a Referral
Heart care: From managing high blood pressure to beating-heart bypass surgery. Our cardiothoracic team performs complex valve repairs and coronary artery bypass grafting—often with smaller incisions and faster recoveries than traditional approaches.
Brain and spine: Our neurologists and neurosurgeons treat everything from migraine disorders that disrupt daily life to brain tumors requiring delicate microsurgery. We don’t send you elsewhere for second opinions. The expertise is here.
Bones and joints: The robotic-assisted joint replacements we perform aren’t about flashy technology. They mean your new hip or knee is positioned with sub-millimeter precision—so it feels natural and lasts longer.
Cancer care: Medical oncology, radiation, and surgical oncology under one roof. Your oncologist talks to your surgeon. Your surgeon talks to your radiation oncologist. You don’t coordinate your own care; we do.
Women’s health: From adolescence through menopause and beyond. Our obstetricians deliver more than 2,000 babies annually. Our Level III NICU means that if your baby needs extra support, they never leave the building.
We also see patients for asthma that won’t quit, digestive issues that need endoscopic intervention, skin conditions affecting your confidence, and pediatric fevers at 2 a.m. If it affects your health, it’s our specialty.
The People Behind Your Care
Nine hundred physicians. Thousands of nurses, technicians, therapists, and support staff.
Some of our surgeons trained at Memorial Sloan Kettering, Johns Hopkins, and Mass General. Several have been named Castle Connolly Top Doctors year after year. But ask any patient what they remember, and they’ll tell you about the nurse who held their hand before surgery. The front-desk coordinator who remembered their name. The housekeeper who asked how their daughter’s soccer game went.
That’s not incidental. That’s intentional.
Technology That Actually Helps
We don’t adopt new technology because it’s new. We adopt it because it helps patients recover faster, experience less pain, or avoid unnecessary procedures.
Robotic surgery: For prostate, gynecologic, and certain orthopedic procedures. Three small incisions instead of one large one. Often home the same day.
AI in radiology: Our mammography software flags suspicious findings with remarkable accuracy. It doesn’t replace the radiologist—it gives them a second set of eyes.
Telemedicine: For medication management, follow-up visits, and certain consultations. Stay home if you’re not feeling well. We’ll meet you where you are.
Electronic health records: Yes, your doctors can see what your specialist recommended. No, we don’t share your information unnecessarily. Privacy isn’t optional here.
More Than Medicine
We know that healing doesn’t stop when you leave the hospital.
Financial clarity: Before your procedure, someone sits down with you and explains what your insurance covers and what it doesn’t. No surprises. No baffling medical bills that arrive months later.
Preventive health: Our executive physicals are thorough. Our basic health checkups are affordable. We tailor screening packages by age, family history, and risk factors—because a 35-year-old and a 65-year-old have different needs.
Recovery support: Cardiac rehab, physical therapy, nutrition counseling. We don’t just fix the problem and send you on your way. We teach you how to stay well.
Recognized, But Not Complacent
The Joint Commission gold seal isn’t a trophy we dust off annually. It’s a living standard we’re re-evaluating every single day.
We’ve received national recognition for stroke care, cardiac surgery, and patient safety. But we’re equally proud of the designation very few hospitals earn: Magnet recognition for nursing excellence. It means our nurses aren’t just compassionate—they’re among the most highly trained in the country.
Let’s Talk About Cost
You shouldn’t need a financial advisor to understand your hospital bill.
We’re in-network with virtually every major insurer in the New York area—Empire Blue Cross, UnitedHealthcare, Aetna, Cigna, Medicare, Medicaid, and many others. Our financial counselors help patients navigate coverage, payment plans, and assistance programs daily.
If you’re uninsured or underinsured, call us anyway. We don’t turn people away for inability to pay.
Beyond Our Walls
Every month, our mobile health unit parks at community centers in Hempstead, Freeport, and Valley Stream. We screen for hypertension and diabetes. We offer flu shots and school physicals. We answer questions from people who haven’t seen a doctor in years.
Our partnership with local food banks addresses what we now understand: that housing stability and nutrition are as critical to health as any medication.
Training the Next Generation
As a teaching hospital affiliated with the Icahn School of Medicine at Mount Sinai, we don’t just practice medicine—we teach it.
Residents train alongside attending physicians. Medical students rotate through our wards. Nurses pursue advanced certifications here. Clinical trials offer patients access to therapies not yet widely available.
This doesn’t make us an academic institution removed from community needs. It means the doctor treating you tomorrow learned from the cases we managed today.
What Our Patients Say
“I came in barely able to walk. Three days after my knee replacement, I was climbing stairs. The robotic technology helped, sure. But it was the physical therapist who stayed 20 minutes late to make sure I felt confident going home.” — David, Oceanside
“When my husband was in the cardiac ICU, I slept in the chair next to him. A nurse brought me blankets and coffee without being asked. She said, ‘This is hard. Let us carry some of it for you.’ That’s when I knew we were in the right place.” — Eleanor, Long Beach
“I was terrified of labor. My obstetrician remembered. She came in on her day off because she knew I needed someone familiar. My daughter is three now. We still send holiday cards.” — Priya, Valley Stream
Your Next Step
You don’t need a referral. You don’t need a medical emergency. You just need to reach out.
Call us: (516) 632-3000
Email: info@mountsinai-southnassau.com
Visit: One Healthy Way, Oceanside, New York
Online: Schedule appointments, message your doctor, or pay your bill at mountsinai-southnassau.org
International patients: Our dedicated team assists with travel coordination, translation services, and continuity of care when you return home. Contact international@mountsinai-southnassau.org.
Questions We Hear Often
What are your visiting hours?
They vary by unit. ICU has more restricted hours. Maternity is more flexible. Call our main line and we’ll connect you with the right department.
Do I need a referral to see a specialist?
That depends on your insurance plan, not on us. Our scheduling team can help you understand your coverage when you book.
Is your emergency room really open 24/7?
Yes. No holidays. No closures. If you need us, we’re here.
How do I know which doctor is right for me?
Our physician referral line matches you with a specialist based on your specific condition, location preferences, and insurance. Many patients tell us they found their primary care doctor this way and stayed for years.
Do you treat children?
Yes. Our pediatric hospitalists are available 24/7, and our pediatric emergency medicine specialists see children of all ages.
What if I can’t afford my copay right now?
Speak with a financial counselor. We can arrange payment plans, screen you for assistance programs, and in some cases, adjust charges based on need.
We’ll Be Here
Mount Sinai South Nassau isn’t the newest hospital on Long Island. We’re not the largest in the Mount Sinai system.
But we are the hospital that has delivered this community’s babies, set its broken bones, and stood by its families through every stage of life—for more than four decades.
We don’t take that for granted. And we don’t plan on going anywhere.
Your health is our life’s work.