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

Dr. Robert Carlyle Irwin, PH.D.

Clinical Psychologist in Carlsbad, CA · enumerated 2007.

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

National Provider Identifier

1124238696

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Registry record

Entity type Individual (Type 1)
Name Dr. Robert Carlyle Irwin
Credential PH.D.
Sex Male
Practice address Carlsbad, CA, 92010
Phone (619) 884-3488
Fax (760) 806-4340
Enumeration date May 23, 2007
Last updated in NPPES Dec 29, 2022

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 PSY 18284 (CA) Primary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier Type State Issuer
8940635 Medicaid CA -

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

What is the NPI number for Robert Irwin?
The National Provider Identifier (NPI) for Robert Irwin is 1124238696, a Type 1 (individual) record in the CMS NPPES registry.
Where does Robert Irwin practice?
The practice location on file with NPPES is in Carlsbad, 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 2022-12-29.