Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Gary S Rosenbaum MD PC

Q: What is the NPI number for Gary S Rosenbaum MD PC?

The NPI for Gary S Rosenbaum MD PC is 1346559192, a Type 2 (organization) record in the CMS NPPES registry.

Infectious Disease Physician in Riverhead, NY · enumerated 2010 · authorized official Sharyn Donnelly, Office Administrator.

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

National Provider Identifier

1346559192

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Registry record

Entity type Organization (Type 2)

Legal business name Gary S Rosenbaum MD PC

Practice address 887 Old Country Rd, Suite A, Riverhead, NY, 11901

Phone (631) 727-6122

Fax (631) 727-2672

Enumeration date Sep 28, 2010

Last updated in NPPES Sep 28, 2010

Taxonomy & classification

207RI0200X Infectious Disease Physician Allopathic & Osteopathic Physicians · License 1735421 (NY) Primary

Authorized official

Name Sharyn Donnelly

Title Office Administrator

Phone (631) 727-6122

Other identifiers

Identifier	Type	State	Issuer
011924229	Medicaid	NY	-

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 the NPI number for Gary S Rosenbaum MD PC?

The NPI for Gary S Rosenbaum MD PC is 1346559192, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Gary S Rosenbaum MD PC?

NPPES lists Sharyn Donnelly (Office Administrator) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-09-28.