Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

John T. Mather Memorial Hospital

Hospice and Palliative Medicine (Family Medicine) Physician in Port Jefferson, NY · enumerated 2012 · authorized official Joseph Wisnoski, Cfo, Vp- Finance.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1073863635

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Registry record

Entity type Organization (Type 2)

Legal business name John T. Mather Memorial Hospital

Practice address 75 North Country Rd, Port Jefferson, NY, 11777

Phone (631) 473-1320

Enumeration date Sep 11, 2012

Last updated in NPPES Sep 11, 2012

Taxonomy & classification

207QH0002X Hospice and Palliative Medicine (Family Medicine) Physician Allopathic & Osteopathic Physicians · License 225349-1 (NY) Primary

Authorized official

Name Joseph Wisnoski

Title Cfo, Vp- Finance

Phone (631) 473-1320

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2012-09-11. Verify at npiregistry.cms.hhs.gov.

Where is John T. Mather Memorial Hospital located?

The practice location on file with NPPES is in Port Jefferson, NY.

Providers at this address

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Anthony Llorens Emergency Medicine Physician · Port Jefferson, NY NPI 1356593255

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-09-11.