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

Mrs. Katherine Therese Lambert, ACSW LICSW CCATOD

Clinical Social Worker in Chelmsford, MA · enumerated 2006.

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

National Provider Identifier

1487742821

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Registry record

Entity type Individual (Type 1)

Name Mrs. Katherine Therese Lambert

Credential ACSW LICSW CCATOD

Sex Female

Practice address Chelmsford, MA, 01824

Phone (978) 726-9874

Enumeration date Oct 11, 2006

Last updated in NPPES Oct 28, 2018

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 1026092 (MA) Primary

Other identifiers

Identifier	Type	State	Issuer
PO8607	Other	MA	BLUECROSS I.D. NO.
8846785252	Other	MA	NATIONAL ASSOCIATION OF S
739	Other	MA	ADDICTION LICENSE
10260092	Other	MA	MA LICENSE
45508	Other	MA	NAADAC

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Katherine Lambert?

Katherine Lambert is registered in NPPES with the primary taxonomy of Clinical Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-10-28.