John T Mather Memorial Hospital of Port Jefferson in Port Jefferson, NY
Also known as John T. Mather Memorial Hospital, Mather Hospital
In a medical emergency, call 911. This page is for information only.
About John T Mather Memorial Hospital of Port Jefferson
John T Mather Memorial Hospital of Port Jefferson is an acute care hospital in Port Jefferson, Suffolk County, New York. It reports its ownership to Medicare as nonprofit (private). It provides emergency services. Its CMS Overall Hospital Quality Star Rating is 5 out of 5. It has 248 licensed beds, according to state license data via HIFLD. The nearest other listed hospital is St Charles Hospital, about 0.7 mi away.
Quality ratings
How this hospital compares with the national rate on each measure group:
Source: Centers for Medicare & Medicaid Services, Hospital General Information. How star ratings work.
Emergency room times
Lower times are better. Reporting period ending September 2025. Source: CMS Timely and Effective Care. What these numbers mean.
Infections and sepsis care
- MRSA bloodstream infectionsNo different · SIR 0.72
- Catheter-associated urinary tract infections (CAUTI)No different · SIR 0.31
- Clostridioides difficile (C. diff) infectionsBetter than national · SIR 0.10
- Central line bloodstream infections (CLABSI)No different · SIR 0.26
- Surgical site infections after colon surgeryNo different · SIR 0.27
71% of patients with severe sepsis or septic shock received all the recommended early care steps (SEP-1). Higher is better.
SIR is the standardized infection ratio: below 1 means fewer infections than predicted for a hospital like this one. Period ending September 2025. Source: CMS Healthcare-Associated Infections and Timely and Effective Care.
What patients say
- Patient survey star rating
- Would definitely recommend77%
- Rated the hospital 9 or 1075%
- Completed surveys552
Survey period ending September 2025. Source: CMS HCAHPS Patient Survey.
Map
40.93975, -73.05323
Nearby hospitals
- St Charles Hospital200 Belle Terre Road, Port Jefferson, NY · Emergency roomAcute care hospital0.7 mi
- Suny/Stony Brook University HospitalHealth Sciences Center Suny, Stony Brook, NY · Level I traumaAcute care hospital3.9 mi
- St Catherine of Siena Hospital50 Route 25a, Smithtown, NY · Emergency roomAcute care hospital10 mi
- Long Island Community Hospital101 Hospital Road, Patchogue, NY · Level III traumaAcute care hospital12 mi
- Northport Veterans Hospital79 Middleville Road, Northport, NY · Emergency roomHospital14 mi
- Northport VA Medical Center79 Middleville Road, Northport, NY · Emergency roomVA medical center15 mi
- Pilgrim Psychiatric Center998 Crooked Hill Road, West Brentwood, NYPsychiatric hospital15 mi
- Ns/Lij Hs Southside Hospital301 East Main Street, Bay Shore, NY · Emergency roomAcute care hospital18 mi
- Bridgeport Hospital267 Grant Street, Bridgeport, CT · Level III traumaAcute care hospital18 mi
- Southwest Connecticut Mental Health System1635 Central Ave, Bridgeport, CTPsychiatric hospital18 mi
Frequently asked questions
Where is John T Mather Memorial Hospital of Port Jefferson located?
John T Mather Memorial Hospital of Port Jefferson is at 75 North Country Road, Port Jefferson, NY 11777 in Suffolk County.
Does John T Mather Memorial Hospital of Port Jefferson have an emergency room?
Yes. John T Mather Memorial Hospital of Port Jefferson reports emergency services to Medicare, and patients spent a median of 235 minutes in its emergency department before leaving. In a life-threatening emergency, call 911.
What is the CMS star rating of John T Mather Memorial Hospital of Port Jefferson?
John T Mather Memorial Hospital of Port Jefferson has a CMS Overall Hospital Quality Star Rating of 5 out of 5. The rating combines measures of mortality, safety of care, readmission, patient experience and timely and effective care, compared with hospitals nationwide.
Is John T Mather Memorial Hospital of Port Jefferson a trauma center?
We have no trauma center designation on record for John T Mather Memorial Hospital of Port Jefferson. Hospitals without one still treat injuries in their emergency department and transfer patients who need a trauma center. Check the New York trauma program for the current list.
What is the phone number of John T Mather Memorial Hospital of Port Jefferson?
The main phone number on record with Medicare is (631) 473-1320.
Would patients recommend John T Mather Memorial Hospital of Port Jefferson?
In the most recent HCAHPS patient survey (552 completed surveys), 77% of patients said they would definitely recommend the hospital, and 75% rated it 9 or 10 out of 10.
Related guides
- How CMS Hospital Star Ratings WorkThe five measure groups behind the 1 to 5 star Overall Hospital Quality Star Rating, how it is calculated and what it leaves out.
- How to Choose a HospitalA practical checklist for planned care: insurance networks, procedure volume, quality ratings, certifications and cost estimates.
- ER Wait Times ExplainedHow triage and the Emergency Severity Index decide who is seen first, why emergency rooms get crowded and where to find timing data.
- What Is a Trauma Center? Levels I to V ExplainedWhat each trauma center level provides, who designates and verifies them, pediatric trauma centers and how trauma systems route patients.