Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Stefanie T. O'Brien, LCSW

Clinical Social Worker in Roslindale, MA · enumerated 2018 · practices at The Leggett Group LLC.

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

National Provider Identifier

1215419270

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Registry record

Entity type Individual (Type 1)

Name Stefanie T. O'Brien

Credential LCSW

Sex Female

Practice address 4238 Washington St Ste 316, Roslindale, MA, 02131

Phone (857) 273-2124

Enumeration date Sep 5, 2018

Last updated in NPPES Sep 5, 2018

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW 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 Stefanie O'Brien?

The National Provider Identifier (NPI) for Stefanie O'Brien is 1215419270, a Type 1 (individual) record in the CMS NPPES registry.

Where does Stefanie O'Brien practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-09-05.