John T Mather Memorial Hospital Of Port Jefferson is a acute care located at 75 North Country Road, Port Jefferson, NY 11777, serving residents of Port Jefferson, Suffolk County, and the broader New York region. Based on official data from the Centers for Medicare & Medicaid Services (CMS), this facility performs above the national average on key safety measures, earning a SafeHospitals USA Safety Score of 7.7/10 (Grade B — Above Average).
The hospital offers 24-hour emergency services. CMS has rated this facility 5 out of 5 stars based on a comprehensive review of clinical outcomes, patient experience, and operational quality.
Contact & Location
To reach John T Mather Memorial Hospital Of Port Jefferson, call (631) 473-1320. The facility is located at 75 North Country Road, Port Jefferson, NY 11777. It is in Suffolk County. For driving directions, search "John T Mather Memorial Hospital Of Port Jefferson Port Jefferson NY" in Google Maps or Apple Maps.
| 📍 Address | 75 North Country Road, Port Jefferson, NY 11777 |
| 📞 Phone | (631) 473-1320 |
| 🏥 Facility Type | Acute Care |
| 🏢 Ownership | Voluntary non-profit - Private |
| 🚨 Emergency Services | ✓ Yes — 24/7 Emergency Department |
| 👶 Birth Friendly | Not designated |
| 📅 Data Last Updated | CMS Medicare Data, 2024 |
Safety Score Breakdown
The SafeHospitals USA Safety Score of 7.7/10 is calculated from six official CMS quality measures — mortality, patient safety, readmissions, hospital-acquired infections, complications, and patient experience. Below is a detailed breakdown of this hospital's performance on each dimension.
2 measures better than national rate; 0 worse
3 safety measures better than national rate
0 readmission measures better than national rate
12 infection measures better than national benchmark
4/5 stars from 498 patient surveys
0 complication measures better than national rate
What Patients Say
The Hospital Consumer Assessment of Healthcare Providers and Systems (HCAHPS) survey — the national standard for measuring patient experience — gave John T Mather Memorial Hospital Of Port Jefferson a patient experience rating of 4 out of 5 stars, based on 498 completed surveys. This score reflects how patients rated communication with nurses and doctors, responsiveness of hospital staff, pain management, medication explanations, and discharge preparation.
Why This Rating Matters
The SafeHospitals USA Safety Score is calculated using official CMS Medicare data — the same data used by the U.S. Department of Health and Human Services to evaluate all Medicare-certified hospitals. A score of 7.7/10 (Grade B) means this hospital performs above the national average on key safety measures. For patients and families planning an elective procedure or evaluating local options for ongoing care, this data provides an objective, evidence-based starting point for informed decision-making.
Always discuss your specific medical needs with a licensed healthcare provider. Hospital quality varies by specialty and procedure type — a high overall score does not guarantee optimal results for every condition. Use this data as one input among several, including referrals from your primary care physician and procedure-specific outcome data where available.
- CMS Provider Data Catalog — Hospital General Information (data.cms.gov)
- CMS Hospital Compare — Patient Experience (HCAHPS) Scores
- CMS Complications and Deaths — Hospital Level Data
- CMS Healthcare-Associated Infections (HAI) — Hospital Level Data
- The Leapfrog Group — Hospital Safety Grades (hospitalsafetygrade.org)