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JOHN T. MATHER MEMORIAL HOSPITAL
NPI 1639585706
Preventive Medicine - Undersea and Hyperbaric Medicine in Port Jefferson, NY

Active since July 09, 2014
75 N COUNTRY RD, PORT JEFFERSON, NY 11777(631) 476-2768(631) 474-4939 Get Directions Write a Review

NPPES record last updated: July 11, 2014. 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 1639585706) is a healthcare organization registered as an undersea and hyperbaric medicine in Port Jefferson, New York and active in the NPI registry since July 2014. The organization lists Joseph Wisnoski, Sr. Vp & Cmo, as its authorized official.

NPPES Registry Identity

NPI1639585706
Entity TypeOrganization
Primary Taxonomy2083P0011X
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) 476-2768 · Fax (631) 474-4939
Phone(631) 476-2768
Fax(631) 474-4939
Organization SubpartNo
Authorized OfficialJoseph WisnoskiSr. Vp & Cmo · (631) 473-1320
Enumeration DateJuly 9, 2014
Last NPPES UpdateJuly 11, 2014
✔ NPI 1639585706 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyPreventive Medicine · Undersea and Hyperbaric MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2083P0011X
Definition
A specialist who treats decompression illness and diving accident cases and uses hyperbaric oxygen therapy to treat such conditions as carbon monoxide poisoning, gas gangrene, non-healing wounds, tissue damage from radiation and burns and bone infections. This specialist also serves as consultant to other physicians in all aspects of hyperbaric chamber operations and assesses risks and applies appropriate standards to prevent disease and disability in divers and other persons working in altered atmospheric conditions.
Also ListedClinic/Center · Health ServiceTaxonomy 261QH0100X
Also ListedClinic/Center · Recovery CareTaxonomy 261QR0800X
Also ListedRehabilitation HospitalTaxonomy 283X00000X
75 N COUNTRY RD, Port Jefferson, NY 11777
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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

10

Medicare enrollment records show 10 clinicians reassign Medicare billing to John T. Mather Memorial Hospital, which bills Medicare for the services they deliver. Of these, 6 practice within 10 miles. They are listed nearest first.

Clinicians by Medicare Specialty 5

Emergency Medicine5
Critical Care (Intensivists)2
Hospice/Palliative Care1
Nurse Practitioner1
Undersea and Hyperbaric Medicine1

Clinicians, nearest first (10)

Kenneth Hirsch, MD
Emergency Medicine
NPI 1972618296
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 476-2808
✔ PECOS✔ Accepts Medicare0.1 mi
Phyllis Macchio, NP
Nurse Practitioner
NPI 1699088955
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts Medicare0.1 mi
Paul No
Hospice/Palliative Care
NPI 1265937940
75 N COUNTRY RD
Port Jefferson, NY 11777
(631) 473-1320
✔ PECOS✔ Accepts Medicare0.1 mi
Andrew Weber, MD
Critical Care (Intensivists)
NPI 1922492305
75 N COUNTRY RD
Port Jefferson, NY 11777
(516) 698-9289
✔ PECOS✔ Accepts Medicare0.1 mi
Thomas Ribaudo, MD
Undersea and Hyperbaric Medicine
NPI 1134237282
45 RESEARCH WAY SUITE 204
East Setauket, NY 11733
(631) 941-2704
✔ PECOS✔ Accepts Medicare3.0 mi
Ali Khan, M.D.
Emergency Medicine
NPI 1225560469
HSC LEVEL 4 ROOM 080 STONY BROOK HOSPITAL
Stony Brook, NY 11794
(631) 444-3880
✔ PECOS4.1 mi
Adam Wos, MD
Emergency Medicine
NPI 1144373960
270 PARK AVE
Huntington, NY 11743
(631) 351-2000
✔ PECOS✔ Accepts Medicare19 mi
Anas Sawas, M.D., M.P.H., M.S.
Emergency Medicine
NPI 1184967135
270 PARK AVE HUNTINGTON HOSPITAL DEPARTMENT OF EMERGENCY MEDICINE
Huntington, NY 11743
(631) 351-2427
✔ PECOS✔ Accepts Medicare19 mi
Melissa Devlin, MD
Critical Care (Intensivists)
NPI 1003078619
891 NORTHERN BLVD SUITE 203
Great Neck, NY 11021
(516) 773-6300
✔ PECOS✔ Accepts Medicare36 mi
Eddie Kim, MD
Emergency Medicine
NPI 1235428525
2380 W HORIZON RIDGE PKWY SUITE 110
Henderson, NV 89052
(702) 823-4255
✔ PECOS✔ Accepts Medicare2,282 mi

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 1639585706. It was assigned to this organization in the NPPES registry on July 9, 2014.

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) 476-2768.

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

The primary specialty registered for this NPI is Preventive Medicine, specializing in Undersea and Hyperbaric Medicine, with taxonomy code 2083P0011X.

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), 10 clinicians in 5 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 (5), Critical Care (Intensivists) (2) and Hospice/Palliative Care (1). Of these, 6 practice 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 July 11, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 years 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.