Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Katherine L. Williams, MS, SLP

Speech-Language Pathologist in Woodbridge, CT · enumerated 2010 · practices at Baron Therapy Services, LLC.

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

National Provider Identifier

1417268954

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Registry record

Entity type Individual (Type 1)

Name Ms. Katherine L. Williams

Credential MS, SLP

Sex Female

Practice address 15 Research Dr, Unit #1, Woodbridge, CT, 06525

Phone (203) 387-1401

Fax (203) 387-1415

Enumeration date Jun 30, 2010

Last updated in NPPES Jan 25, 2019

Taxonomy & licenses

235Z00000X Speech-Language Pathologist Speech, Language and Hearing Service Providers · License 4274 (CT) Primary

SLP · Speech-Language Pathologist: A licensed clinician treating speech, language, and swallowing disorders. About the SLP 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 Katherine Williams?

The National Provider Identifier (NPI) for Katherine Williams is 1417268954, a Type 1 (individual) record in the CMS NPPES registry.

Where does Katherine Williams practice?

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

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-01-25.