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

Dr. Warren R Walker, PH.D.

Psychologist in Westlake Village, CA · enumerated 2007 · practices at Ocean View Marriage and Family.

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

National Provider Identifier

1528286234

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Registry record

Entity type Individual (Type 1)

Name Dr. Warren R Walker

Credential PH.D.

Sex Male

Practice address Westlake Village, CA, 91361

Phone (805) 497-3155

Fax (805) 371-4875

Enumeration date Apr 20, 2007

Last updated in NPPES Oct 9, 2013

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

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY4892 (CA) 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

What is the NPI number for Warren Walker?

The National Provider Identifier (NPI) for Warren Walker is 1528286234, a Type 1 (individual) record in the CMS NPPES registry.

Where does Warren Walker practice?

The practice location on file with NPPES is in Westlake Village, CA. 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 2013-10-09.