Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Paul Joseph Sullivan, PHD

Psychologist in Lexington, MA · enumerated 2018.

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

National Provider Identifier

1891278669

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Registry record

Entity type Individual (Type 1)

Name Dr. Paul Joseph Sullivan

Credential PHD

Sex Male

Practice address 81 Hartwell Ave Ste 310, Lexington, MA, 02421

Phone (781) 918-6860

Enumeration date Sep 7, 2018

Last updated in NPPES Aug 12, 2025

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 10000604 (MA) Primary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 022843 (NY) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License 002253 (RI) Secondary

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

Where does Paul Sullivan practice?

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

What is the NPI number for Paul Sullivan?

The National Provider Identifier (NPI) for Paul Sullivan is 1891278669, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-08-12.