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

Jeffrey Michael Williams

Clinical Social Worker in Allston, MA · enumerated 2012.

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

National Provider Identifier

1386997807

Verified

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Registry record

Entity type Individual (Type 1)

Name Jeffrey Michael Williams

Sex Male

Practice address Allston, MA, 02134

Phone (617) 782-6460

Enumeration date Oct 22, 2012

Last updated in NPPES Oct 22, 2012

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 105665 (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.

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Frequently asked questions

Where does Jeffrey Williams practice?

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

What is the NPI number for Jeffrey Williams?

The National Provider Identifier (NPI) for Jeffrey Williams is 1386997807, 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 2012-10-22.