Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Erin E Williams, PSY.D.

Psychologist in Lake Geneva, WI · enumerated 2011.

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

National Provider Identifier

1013206887

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Registry record

Entity type Individual (Type 1)

Name Dr. Erin E Williams

Credential PSY.D.

Sex Female

Practice address 146 E Geneva Sq, Lake Geneva, WI, 53147

Phone (877) 666-7223

Fax (262) 249-7132

Enumeration date Apr 1, 2011

Last updated in NPPES Jul 21, 2022

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 3095 (WI) Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD 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.

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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 Erin Williams?

Erin Williams is registered in NPPES with the primary taxonomy of Psychologist. 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 2022-07-21.