Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Casey Zack, PHD.

Psychologist in Chowchilla, CA · enumerated 2017.

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

National Provider Identifier

1023539475

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Registry record

Entity type Individual (Type 1)

Name Dr. Casey Zack

Credential PHD.

Sex Male

Practice address 21633 Avenue 24, Chowchilla, CA, 93610

Phone (559) 665-6100

Enumeration date Jul 6, 2017

Last updated in NPPES Dec 21, 2022

Taxonomy & licenses

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers Secondary

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License PSY29850 (CA) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers Secondary

103TF0200X Forensic Psychologist Behavioral Health & Social Service Providers Secondary

103TF0200X Forensic Psychologist Behavioral Health & Social Service Providers · License PSY29850 (CA) Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY29850 (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

Is NPI 1023539475 active?

Yes, as of the latest NPPES snapshot, NPI 1023539475 is active (record last updated 2022-12-21).

How do I verify Casey Zack's NPI record?

Cross-check NPI 1023539475 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-21.