Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Claire Louise O'Brien, LICSW

Clinical Social Worker in North Andover, MA · enumerated 2018.

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

National Provider Identifier

1629559075

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Registry record

Entity type Individual (Type 1)

Name Claire Louise O'Brien

Credential LICSW

Sex Female

Practice address 276 Ma Ave, North Andover, MA, 01845

Phone (978) 687-2575

Enumeration date Aug 23, 2018

Last updated in NPPES Aug 23, 2018

Taxonomy & licenses

163W00000X Registered Nurse Nursing Service Providers · License RN215372 (MA) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 106428 (MA) 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

Where does Claire O'Brien practice?

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

What is the NPI number for Claire O'Brien?

The National Provider Identifier (NPI) for Claire O'Brien is 1629559075, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-08-23.