Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Westchester Internal Medicine PC

Q: What is the NPI number for Westchester Internal Medicine PC?

The NPI for Westchester Internal Medicine PC is 1245279660, a Type 2 (organization) record in the CMS NPPES registry.

Internal Medicine Physician in Sleepy Hollow, NY · enumerated 2006 · authorized official Owen O'Neill, President.

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

National Provider Identifier

1245279660

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Registry record

Entity type Organization (Type 2)

Legal business name Westchester Internal Medicine PC

Practice address 777 N Broadway, Suite 310, Sleepy Hollow, NY, 10591

Phone (914) 333-0034

Fax (914) 333-0046

Enumeration date Jun 5, 2006

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 176762 (NY) Primary

Authorized official

Name Owen O'Neill

Title President

Phone (914) 333-0034

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 Westchester Internal Medicine PC?

The NPI for Westchester Internal Medicine PC is 1245279660, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Westchester Internal Medicine PC?

NPPES lists Owen O'Neill (President) 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 2020-08-22.