Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mr. Brian John O'Neill, APRN, MSN, CCRN-CSC

Adult Health Nurse Practitioner in New Haven, CT · enumerated 2006.

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

National Provider Identifier

1821011396

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Registry record

Entity type Individual (Type 1)

Name Mr. Brian John O'Neill

Credential APRN, MSN, CCRN-CSC

Sex Male

Practice address New Haven, CT, 06510

Phone (203) 412-6904

Fax (203) 688-1663

Enumeration date Jul 25, 2006

Last updated in NPPES Jul 9, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

363LA2200X Adult Health Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 002360 (CT) Primary

APRN · Advanced Practice Registered Nurse: An umbrella credential covering NPs, CRNAs, CNMs, and clinical nurse specialists. About the APRN credential

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 Brian O'Neill?

The National Provider Identifier (NPI) for Brian O'Neill is 1821011396, a Type 1 (individual) record in the CMS NPPES registry.

Where does Brian O'Neill practice?

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

Other providers at this practice address

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Melih Arici Diagnostic Radiology Physician · New Haven, CT NPI 1265437024 Laura Berenstain Pediatric Anesthesiology Physician · New Haven, CT NPI 1467451302 Howard Hochster Medical Oncology Physician · New Haven, CT NPI 1538160668 Wendy Barr Family Medicine Physician · New Haven, CT NPI 1427050939 Joseph Cardinale Therapeutic Radiology Physician · New Haven, CT NPI 1932191376 Vanna Dest Nurse Practitioner · New Haven, CT NPI 1407849425 David Cone Emergency Medicine Physician · New Haven, CT NPI 1770571440 Kevin Burns Physician Assistant · New Haven, CT NPI 1487642153

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-09.