Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Brian William Oconnor, MD

Addiction Medicine (Preventive Medicine) Physician in Woburn, MA · enumerated 2005.

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

National Provider Identifier

1912991522

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Registry record

Entity type Individual (Type 1)

Name Brian William Oconnor

Credential MD

Sex Male

Practice address 20 Tower Office Park, Woburn, MA, 01801

Phone (781) 305-3300

Fax (781) 305-3227

Enumeration date Sep 9, 2005

Last updated in NPPES Jul 29, 2025

Taxonomy & licenses

2083A0300X Addiction Medicine (Preventive Medicine) Physician Allopathic & Osteopathic Physicians · License 20743 (NH) Secondary

2083A0300X Addiction Medicine (Preventive Medicine) Physician Allopathic & Osteopathic Physicians · License 72453 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
3079767	Medicaid	MA	-

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 Oconnor?

The National Provider Identifier (NPI) for Brian Oconnor is 1912991522, a Type 1 (individual) record in the CMS NPPES registry.

Where does Brian Oconnor practice?

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

Other providers at this practice address

Browse all →

Tarajean Lewis Women's Health Nurse Practitioner · Woburn, MA NPI 1730240607 Janice Biggs Mental Health Counselor · Woburn, MA NPI 1770625865 Nancy Parker Counselor · Woburn, MA NPI 1801031000 Middlesex Recovery Professional Corporation Addiction Medicine (Family Medicine) Physician · Woburn, MA NPI 1487971461 Diane Mcisaac Addiction (Substance Use Disorder) Counselor · Woburn, MA NPI 1598086944 Ali Bilal Addiction (Substance Use Disorder) Counselor · Woburn, MA NPI 1548581788 Scott Pelletier Addiction (Substance Use Disorder) Counselor · Woburn, MA NPI 1487975652 Lee Rinaldi Addiction (Substance Use Disorder) Counselor · Woburn, MA NPI 1639490972

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-07-29.