Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Michael W. Mendelson, M.D., P.C.

Internal Medicine Physician in Port Jefferson Station, NY · enumerated 2010 · authorized official Michael Mendelson, President.

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

National Provider Identifier

1023318292

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Registry record

Entity type Organization (Type 2)

Legal business name Michael W. Mendelson, M.D., P.C.

Practice address 5360 Nesconset Hwy Ste B, Port Jefferson Station, NY, 11776

Phone (631) 331-3200

Fax (631) 331-3694

Enumeration date Oct 22, 2010

Last updated in NPPES May 24, 2021

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 110115 (NY) Primary

207RP1001X Pulmonary Disease Physician Allopathic & Osteopathic Physicians · License 110115 (NY) Secondary

Authorized official

Name Michael Mendelson

Title President

Phone (631) 331-3200

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Michael W. Mendelson, M.D., P.C.?

Michael W. Mendelson, M.D., P.C. is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-05-24.