Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Rebecca O'Neill, PHYSICIAN ASSISTANT

Medical Physician Assistant in Stamford, CT · enumerated 2005.

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

National Provider Identifier

1548254774

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Registry record

Entity type Individual (Type 1)

Name Mrs. Rebecca O'Neill

Credential PHYSICIAN ASSISTANT

Sex Female

Practice address 1177 Summer St, 5th Floor, Stamford, CT, 06905

Phone (203) 653-4321

Enumeration date Sep 2, 2005

Last updated in NPPES Apr 3, 2026

Taxonomy & licenses

363AS0400X Surgical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 000766 (CT) Secondary

363AS0400X Surgical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 003558 (NY) Secondary

207RC0200X Critical Care Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License MA063379 (PA) Secondary

363AM0700X Medical Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License MA063379 (PA) Primary

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 Rebecca O'Neill?

The National Provider Identifier (NPI) for Rebecca O'Neill is 1548254774, a Type 1 (individual) record in the CMS NPPES registry.

Where does Rebecca O'Neill practice?

The practice location on file with NPPES is in Stamford, CT. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Susan Eysmann Cardiovascular Disease Physician · Stamford, CT NPI 1841225612 Robert Labarre Cardiovascular Disease Physician · Stamford, CT NPI 1689692055 Mark Heiman Cardiovascular Disease Physician · Stamford, CT NPI 1447278064 Samuel Brodsky Cardiovascular Disease Physician · Stamford, CT NPI 1073532610 Michael Pittaro Clinical Cardiac Electrophysiology Physician · Stamford, CT NPI 1891806857 Robert Moskowitz Cardiovascular Disease Physician · Stamford, CT NPI 1639280324 Diane Dellangelo Family Nurse Practitioner · Stamford, CT NPI 1225132707 Sarellen Lawson Nurse Practitioner · Stamford, CT NPI 1386748945

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-04-03.