NPI Portal NPI Lookup & Verification

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

Mrs. Mary Katherine Williams, L.C.S.W.

Clinical Social Worker in Fayetteville, AR · enumerated 2006 · practices at Christie Keller Dnp Pllc.

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

National Provider Identifier

1376501593

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Registry record

Entity type Individual (Type 1)
Name Mrs. Mary Katherine Williams
Credential L.C.S.W.
Sex Female
Practice address Fayetteville, AR, 72703
Phone (479) 466-9121
Fax (479) 974-2002
Enumeration date May 4, 2006
Last updated in NPPES Oct 24, 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 1752C (AR) Primary
LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

Other identifiers

Identifier Type State Issuer
089.0134618TELE Other VT SOCIAL WORK LICENSE
1752C Other AR SOCIAL WORK LICENSE
61413647 Other WA SOCIAL WORK LICENSE
5X496 Other AR BLUE CROSS PROVIDER #

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 Mary Williams?
Mary Williams 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 2023-10-24.