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

Ellen Weiss Williams, PH.D.

Clinical Psychologist in Tempe, AZ · enumerated 2006.

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

National Provider Identifier

1205888427

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Registry record

Entity type Individual (Type 1)

Name Ellen Weiss Williams

Credential PH.D.

Sex Female

Practice address Tempe, AZ, 85284

Phone (480) 345-7031

Fax (480) 831-6799

Enumeration date May 16, 2006

Last updated in NPPES Oct 26, 2007

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 462 (AZ) Primary

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

Is NPI 1205888427 active?

Yes, as of the latest NPPES snapshot, NPI 1205888427 is active (record last updated 2007-10-26).

How do I verify Ellen Williams's NPI record?

Cross-check NPI 1205888427 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-10-26.