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

Dr. Brian Marcus Osullivan, PHD

Psychologist in Northborough, MA · enumerated 2006.

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

National Provider Identifier

1467419168

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Registry record

Entity type Individual (Type 1)

Name Dr. Brian Marcus Osullivan

Credential PHD

Sex Male

Practice address Northborough, MA, 01532

Phone (508) 831-3030

Enumeration date Apr 27, 2006

Last updated in NPPES May 29, 2018

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

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 3157 (MA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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 Osullivan?

The National Provider Identifier (NPI) for Brian Osullivan is 1467419168, a Type 1 (individual) record in the CMS NPPES registry.

Where does Brian Osullivan practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-05-29.