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

Mr. James Andrew Leathem, LCSW

Clinical Social Worker in Boston, MA · enumerated 2006.

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

National Provider Identifier

1649387150

Verified

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Registry record

Entity type Individual (Type 1)

Name Mr. James Andrew Leathem

Credential LCSW

Sex Male

Practice address Boston, MA, 02130

Phone (203) 638-8590

Enumeration date Aug 23, 2006

Last updated in NPPES Mar 7, 2023

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

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 069832-1 (NY) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 012554 (CT) 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 James Leathem?

The National Provider Identifier (NPI) for James Leathem is 1649387150, a Type 1 (individual) record in the CMS NPPES registry.

Where does James Leathem practice?

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

Other providers at this practice address

Browse all →

Thomas Fantes Family Medicine Physician · Boston, MA NPI 1972500429 Elisabeth Buchanan Social Worker · Boston, MA NPI 1285636159 Edward Lew Gastroenterology Physician · Jamaica Plain, MA NPI 1376526459 Michael Dawes Psychiatry Physician · Boston, MA NPI 1841274594 Barbara Cooper Clinical Psychologist · Boston, MA NPI 1720063084 Joseph Rafferty Family Medicine Physician · Boston, MA NPI 1669459723 Nhan Do Internal Medicine Physician · Boston, MA NPI 1750353967 Christopher Conroy Physical Therapist · Boston, MA NPI 1942273495

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-03-07.