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

Mrs. Carol Yvonne Williams, PH.D.,L.C.S.W.

Clinical Social Worker in Seguin, TX · enumerated 2006.

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

National Provider Identifier

1801998315

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Registry record

Entity type Individual (Type 1)

Name Mrs. Carol Yvonne Williams

Credential PH.D.,L.C.S.W.

Sex Female

Practice address Seguin, TX, 78156

Phone (830) 433-5076

Fax (830) 433-5076

Enumeration date Sep 4, 2006

Last updated in NPPES Jun 5, 2025

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 56416 (TX) Primary

171M00000X Case Manager/Care Coordinator Other Service Providers · License 56416 (TX) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LCS13799 (CA) Secondary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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

Where does Carol Williams practice?

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

What is the NPI number for Carol Williams?

The National Provider Identifier (NPI) for Carol Williams is 1801998315, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-06-05.