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JOHN T. MATHER MEMORIAL HOSPITAL
NPI 1467249334
Internal Medicine - Critical Care Medicine in Port Jefferson, NY

Active since April 23, 2025
75 N COUNTRY RD, PORT JEFFERSON, NY 11777(631) 473-1320(631) 686-7972 Get Directions Write a Review

NPPES record last updated: April 23, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About John T. Mather Memorial Hospital NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN T. MATHER MEMORIAL HOSPITAL (NPI 1467249334) is a healthcare organization registered as a critical care medicine in Port Jefferson, New York and active in the NPI registry since April 2025. The organization maintains 13 additional practice locations and lists Christine Livreri, Avp, as its authorized official.

NPPES Registry Identity

NPI1467249334
Entity TypeOrganization
Primary Taxonomy207RC0200X
Legal Business NameJOHN T. MATHER MEMORIAL HOSPITAL
Location Address75 N COUNTRY RDPort Jefferson, NY 11777-2119
Mailing Address75 N Country RdPort Jefferson, NY 11777-2119 · (631) 473-1320 · Fax (631) 686-7972
Phone(631) 473-1320
Fax(631) 686-7972
Organization SubpartNo
Authorized OfficialChristine LivreriAvp · (631) 473-1320
Enumeration DateApril 23, 2025
NPPES CertifiedApril 23, 2025
✔ NPI 1467249334 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Critical Care MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207RC0200X
Definition
An internist who diagnoses, treats and supports patients with multiple organ dysfunction. This specialist may have administrative responsibilities for intensive care units and may also facilitate and coordinate patient care among the primary physician, the critical care staff and other specialists.
75 N COUNTRY RD, Port Jefferson, NY 11777
Open in Google Maps ↗

Secondary Practice Locations 13

Location 170 N Country Rd Ste 302Port Jefferson, NY 11777-2161 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 25225 Nesconset HwyPort Jefferson Station, NY 11776-2053 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 3500 Commack Rd Bldg E, Suite 150DCommack, NY 11725-5020 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 4200 Belle Terre RdPort Jefferson, NY 11777-1928 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 5625 Belle Terre Rd Ste 204Port Jefferson, NY 11777-2318 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 6125 Oakland Ave Ste 301Port Jefferson, NY 11777-2130 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 7170 N Country Rd Ste 3Port Jefferson, NY 11777-2606 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 870 N Country Rd Ste 205Port Jefferson, NY 11777-2161 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 9625 Belle Terre Rd Ste 113Port Jefferson, NY 11777-2316 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 10100 Highlands Blvd Ste 303Port Jefferson, NY 11777-2320 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 11100 Highlands Blvd Ste 201Port Jefferson, NY 11777-2320 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 12125 Oakland Ave Ste 303Port Jefferson, NY 11777-2130 · Phone (631) 473-1320 · Fax (631) 686-7972
Location 13100 Highlands Blvd Ste 101Port Jefferson, NY 11777-2320 · Phone (631) 473-1320 · Fax (631) 686-7972

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

John T. Mather Memorial Hospital is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

254

Medicare enrollment records show 254 clinicians reassign Medicare billing to John T. Mather Memorial Hospital, which bills Medicare for the services they deliver. Of these, 59 practice at this address and 104 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 20

Emergency Medicine79
Nurse Practitioner66
Internal Medicine30
Psychiatry29
Critical Care (Intensivists)16
Hospitalist11
Diagnostic Radiology5
General Surgery3
12 other specialties15

Nearest to this location (20)

See all 254
Yasser Abdelbaki, M.D.
Internal Medicine
NPI 1790149771
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Mohamed Ahmed
Psychiatry
NPI 1912534652
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Catherine Audus
Nurse Practitioner
NPI 1346790755
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOSSame address
Swagato Bhattacharyya, DO
Psychiatry
NPI 1720585458
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 686-2517
✔ PECOS✔ Accepts MedicareSame address
Michelle Byrne, ANP
Nurse Practitioner
NPI 1750769808
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Bo Chao, M.D.
Internal Medicine
NPI 1659462695
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Halyna Chykyda
Internal Medicine
NPI 1881073740
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Michael Destefano, M.D.
Psychiatry
NPI 1407200116
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Marina Dillon, FNP-C
Nurse Practitioner
NPI 1043057607
75 N COUNTRY RD
Port Jefferson Station, NY 11777
(631) 805-2150
✔ PECOS✔ Accepts MedicareSame address
Christopher Driscoll, DO
Emergency Medicine
NPI 1629697420
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Glen Granati, M.D.
Critical Care (Intensivists)
NPI 1467872739
MATHER HOSPITAL, 75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Kenneth Hirsch, MD
Emergency Medicine
NPI 1972618296
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 476-2808
✔ PECOS✔ Accepts MedicareSame address
Jeffrey Kott, M.D.
Critical Care (Intensivists)
NPI 1871024505
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Bradley Minter, M.D.
Hospitalist
NPI 1578901542
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 686-7654
✔ PECOS✔ Accepts MedicareSame address
Paul No
Hospice/Palliative Care
NPI 1265937940
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Michelle Price, MD
Diagnostic Radiology
NPI 1629080478
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts MedicareSame address
Harinder Sawhney, MD
Hospitalist
NPI 1669518437
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 686-7654
✔ PECOS✔ Accepts MedicareSame address
Susan Emanuele, M.D.
Hematology/Oncology
NPI 1902965163
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 686-7654
✔ PECOS✔ Accepts MedicareSame address
Ashish Agarwala, D.O
General Surgery
NPI 1982848156
625 BELLE TERRE RD SUITE 202
Port Jefferson, NY 11777
(631) 689-0220
✔ PECOS✔ Accepts MedicareSame address
Ella Rosenbloom, M.D.
Endocrinology
NPI 1811275548
625 BELLE TERRE RD
Port Jefferson, NY 11777
(631) 686-2551
✔ PECOS✔ Accepts MedicareSame address
See all 254 clinicians

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John T. Mather Memorial Hospital's NPI number?

The NPI number for John T. Mather Memorial Hospital is 1467249334. It was assigned to this organization in the NPPES registry on April 23, 2025.

Where is John T. Mather Memorial Hospital located?

John T. Mather Memorial Hospital is located at 75 N Country Rd, Port Jefferson, NY 11777. The listed phone number is (631) 473-1320.

What is John T. Mather Memorial Hospital's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Critical Care Medicine, with taxonomy code 207RC0200X.

Is John T. Mather Memorial Hospital enrolled in Medicare?

Yes. John T. Mather Memorial Hospital is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through John T. Mather Memorial Hospital?

According to the CMS Revalidation Reassignment List (October 2026 release), 254 clinicians in 20 Medicare specialties reassign their Medicare billing to John T. Mather Memorial Hospital. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Emergency Medicine (79), Nurse Practitioner (66) and Internal Medicine (30). Of these, 59 practice at this address and 104 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for John T. Mather Memorial Hospital was last updated on April 23, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.