Data Incident Notice 

A Catholic Health vendor, Serviceaide, experienced a data breach resulting in limited patient information being exposed online.  Serviceaide will be sending out patient notification letters to potentially affected patients.  Information will be posted on Serviceaide’s homepage at: https://www.serviceaide.com/notices

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5300 Military Rd.
Lewiston, NY 14092

24/7 Emergency Department
9:00 a.m. - 9:00 p.m.

Service Hours

Emergency Department

Always Open

Blood Draw

Monday – Friday: 7:00 a.m. to 4:00 p.m.
Saturday: 7:00 a.m. to 12:00 p.m.
Sunday: 7:30 a.m. to 11:15 a.m.

CT Scanning

Monday – Friday: 7:30 a.m. to 5 p.m.
Saturday: 8:00 a.m. to 3:00 p.m.

MRI

Monday – Friday: 7:00 a.m. to 4:30 p.m.
Saturday: 7:30 a.m. to 2:30 p.m.

Digital Mammography

Monday – Friday 7:30 a.m. to 5:30 p.m.
Evenings & Saturdays by appointment.

Bone Densitometry / DEXA

Monday – Friday 7:30 a.m. to 5:30 p.m.
Evenings & Saturdays by appointment.

Physical Therapy

Monday – Thursday: 7:00 a.m. to 6:00 p.m.
Friday: 7:00 a.m. to 3:00 p.m.

Nuclear Medicine

Monday – Friday: 7:00 a.m. to 3:00 p.m.

Superior Services at Mount. St. Mary's Hospital

Mount St. Mary's hospital offers comprehensive healthcare services covering the full range of care. Our emergency department is always open for urgent needs, and we're proud to provide uniquely exceptional care in a number of different specialties.

View All Specialties

Stroke Care

Mount St. Mary’s Hospital serves the Niagara region as a New York State designated Stroke Center. As a part of the network of Stroke Centers of Catholic Health, we have a dedicated stroke care unit, state-of-the-art facilities, and inpatient rehabilitation.

» Stroke Care

Addiction Management

Mount St. Mary's Hospital provides inpatient treatment for alcohol and substance use disorders at the Clearview Treatment Center, a confidential program dedicated to holistic care for men and women.

» Addiction Management

Cardiac Care

Mount St. Mary's Cardiology Services offer patients a full range of diagnostic and treatment procedures. We also provide cardiac rehabilitation programs using a collaborative care model.

» Cardiac Care

Obstetric Care

Receive your prenatal and postpartum care at the Center for Women at Mount St. Mary's Hospital and when it comes to time to deliver your little one, you'll have access to the region's best labor and delivery services at Sisters of Charity Hospital.

» Obstetric Care

Patient & Visitor Information

Whether you’re coming in as a patient or visiting a loved one, we want you to have all the information you need to put your mind at ease. From where to park to how to order a meal, read up on our policies and suggestions for your stay!

Family visits patient in hospital

Mount St. Mary's Quick Facts

Our commitment to excellence and quality care is demonstrated through our awards, recognition, and care statistics.

175

beds

15,363

annual ER visits

Mount St. Mary's Events

Nothing from May 21, 2025 to June 21, 2025.

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