NPPES file of Aug 9, 2026

John T Mather Memorial Hospital

John T Mather Memorial Hospital holds 28 active organization NPIs in the federal registry, with practice locations in 3 New York cities. Each location can bill under its own NPI.

CMS NPPES registry, file of Aug 9, 2026 · legal names grouped after punctuation and "LLC" are removed · method · Verify with CMS →

Which NPI is yours?

Search the organization with your city to find the NPI for the location you visit or bill.

Find a location's NPI

Port Jefferson has the most NPIs, 26

  1. Port Jefferson26
  2. Mount Sinai1
  3. Port Jefferson Station1

Source: CMS NPPES monthly file of Aug 9, 2026, organization NPIs by practice city.

Most NPIs were issued in 2006 and 2014

John T Mather Memorial Hospital NPIs by year issued2005: 1, 2006: 7, 2007: 2, 2008: 1, 2009: 1, 2010: 1, 2011: 2, 2012: 1, 2013: 0, 2014: 4, 2015: 3, 2016: 1, 2017: 0, 2018: 0, 2019: 0, 2020: 0, 2021: 2, 2022: 0, 2023: 0, 2024: 0, 2025: 202468200520072009201120132015201720192021202320252006: 72014: 412111213122
John T Mather Memorial Hospital NPIs by year issued2005: 1, 2006: 7, 2007: 2, 2008: 1, 2009: 1, 2010: 1, 2011: 2, 2012: 1, 2013: 0, 2014: 4, 2015: 3, 2016: 1, 2017: 0, 2018: 0, 2019: 0, 2020: 0, 2021: 2, 2022: 0, 2023: 0, 2024: 0, 2025: 202468200520072009201120132015201720192021202320252006: 72014: 412111213122
John T Mather Memorial Hospital NPIs by year issued2005: 1, 2006: 7, 2007: 2, 2008: 1, 2009: 1, 2010: 1, 2011: 2, 2012: 1, 2013: 0, 2014: 4, 2015: 3, 2016: 1, 2017: 0, 2018: 0, 2019: 0, 2020: 0, 2021: 2, 2022: 0, 2023: 0, 2024: 0, 2025: 20246820072010201320162019202220252006: 72014: 412111213122

Source: CMS NPPES, enumeration dates.

7 NPIs were issued in 2006 alone, more than in any other year; none in 8 of the years between.

Port Jefferson locations

The city with the most John T Mather Memorial Hospital NPIs. The full list of all 28 follows.

NPILocationPrimary taxonomyIssued
109371872875 N COUNTRY RD, Port JeffersonGeneral Acute Care HospitalMay 27, 2005
141704406675 N COUNTRY RD, Port JeffersonFamily Nurse PractitionerOct 6, 2006
1194812479120 N COUNTRY RD, Port JeffersonDiagnostic Radiology PhysicianOct 6, 2006
182118510975 N COUNTRY RD, Port JeffersonNurse PractitionerOct 6, 2006
110491374875 N COUNTRY RD, Port JeffersonEmergency Medicine PhysicianOct 6, 2006
193229631675 N COUNTRY RD, Port JeffersonHospitalist PhysicianOct 6, 2006
139683475075 N COUNTRY RD, Port JeffersonAdult Health Nurse PractitionerOct 12, 2006
1568590115120 N COUNTRY RD, Port JeffersonGeneral Acute Care HospitalMar 2, 2007
All 28 locations, by city
NPILocationPrimary taxonomyIssued
15687744535505 NESCONSET HWY, Mount SinaiPsychiatry PhysicianJul 8, 2010
109371872875 N COUNTRY RD, Port JeffersonGeneral Acute Care HospitalMay 27, 2005
141704406675 N COUNTRY RD, Port JeffersonFamily Nurse PractitionerOct 6, 2006
1194812479120 N COUNTRY RD, Port JeffersonDiagnostic Radiology PhysicianOct 6, 2006
182118510975 N COUNTRY RD, Port JeffersonNurse PractitionerOct 6, 2006
110491374875 N COUNTRY RD, Port JeffersonEmergency Medicine PhysicianOct 6, 2006
193229631675 N COUNTRY RD, Port JeffersonHospitalist PhysicianOct 6, 2006
139683475075 N COUNTRY RD, Port JeffersonAdult Health Nurse PractitionerOct 12, 2006
1568590115120 N COUNTRY RD, Port JeffersonGeneral Acute Care HospitalMar 2, 2007
189181607075 N COUNTRY RD, Port JeffersonDiagnostic Radiology PhysicianApr 3, 2007
182124475775 N COUNTRY RD, Port JeffersonGeneral Acute Care HospitalAug 12, 2008
142728035375 N COUNTRY RD, Port JeffersonSurgery PhysicianAug 11, 2009
128592023175 N COUNTRY RD, Port JeffersonNeuromusculoskeletal Medicine & OMM PhysicianJun 28, 2011
133642879675 N COUNTRY RD, Port JeffersonDiagnostic Radiology PhysicianAug 16, 2011
107386363575 NORTH COUNTRY RD, Port JeffersonHospice and Palliative Medicine (Family Medicine) PhysicianSep 11, 2012
1265844716625 BELLE TERRE RD SUITE 203, Port JeffersonMetabolic Nutrition Registered DietitianJun 2, 2014
163958570675 N COUNTRY RD, Port JeffersonUndersea and Hyperbaric Medicine (Preventive Medicine) PhysicianJul 9, 2014
141735558775 N COUNTRY RD, Port JeffersonPhysical TherapistDec 5, 2014
188108269175 N COUNTRY RD, Port JeffersonGeneral Acute Care HospitalDec 31, 2014
192248618275 N COUNTRY RD, Port JeffersonPain Medicine (Physical Medicine & Rehabilitation) PhysicianMay 8, 2015
162945659575 N COUNTRY RD, Port JeffersonLocal Education Agency (LEA)May 12, 2015
136681689475 N COUNTRY RD SUITE 201, Port JeffersonObesity Medicine (Internal Medicine) PhysicianNov 20, 2015
175074043775 N COUNTRY RD, Port JeffersonGeneral Acute Care HospitalFeb 23, 2016
179037751375 N COUNTRY RD, Port JeffersonThoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianFeb 4, 2021
152865034875 N COUNTRY RD, Port JeffersonInterventional Cardiology PhysicianFeb 4, 2021
165917750975 N COUNTRY RD FL 2, Port JeffersonClinic PharmacyFeb 21, 2025
146724933475 N COUNTRY RD, Port JeffersonCritical Care Medicine (Internal Medicine) PhysicianApr 23, 2025
137664237175 N COUNTRY RD, Port Jefferson StationPsychiatry PhysicianSep 22, 2006

Checking an organization

  1. Match the NPI to the exact location you will visit or bill; each location can have its own.
  2. Confirm the business entity with the secretary of state.
  3. Check the HHS-OIG exclusion list for the organization and its owners.
  4. Verify each clinician you will see on their own record and with the state license search.

Common questions

Why does John T Mather Memorial Hospital have 28 NPIs?

An organization may obtain more than one Type 2 NPI, for example for separate locations or units that bill on their own. John T Mather Memorial Hospital's NPIs list practice locations in 3 cities.

Is an organization NPI a license?

No. An NPI identifies who bills. Facilities and the clinicians who work there are licensed separately by the state.

Source: CMS National Plan and Provider Enumeration System (NPPES), monthly file of Aug 9, 2026 (NPPES files on CMS.gov). An NPI identifies who bills; it is not a license.