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

Dr. Randall Lee Ahn, PHD, MLIS

Q: What is the NPI number for Randall Ahn?

The National Provider Identifier (NPI) for Randall Ahn is 1093939399, a Type 1 (individual) record in the CMS NPPES registry.

Clinical Child & Adolescent Psychologist in Fontana, CA · enumerated 2007 · practices at Anthony Benigno, Psyd., Psychological Services, PC.

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

National Provider Identifier

1093939399

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Registry record

Entity type Individual (Type 1)

Name Dr. Randall Lee Ahn

Credential PHD, MLIS

Sex Male

Practice address Fontana, CA, 92336

Phone (909) 244-9593

Fax (833) 903-0337

Enumeration date Apr 11, 2007

Last updated in NPPES May 7, 2024

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

Taxonomy & licenses

103TC2200X Clinical Child & Adolescent Psychologist Behavioral Health & Social Service Providers · License PSY13956 (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
PSY13956	Other	CA	PSYCHOLOGY LICENSE

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

Where does Randall Ahn practice?

The practice location on file with NPPES is in Fontana, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Randall Ahn?

The National Provider Identifier (NPI) for Randall Ahn is 1093939399, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Anthony Benigno Clinical Psychologist · Fontana, CA NPI 1356560668 Jessica De Santiago Psychologist · Fontana, CA NPI 1750717880 Kalila Jimenez Marriage & Family Therapist · Fontana, CA NPI 1639688831 Theodore Swigart Clinical Psychologist · Fontana, CA NPI 1881188845 Anthony Benigno, Psyd., Psychological Services, PC Mental Health Clinic/Center (Including Community Mental Health Center) · Fontana, CA NPI 1295202943 Alexandra Mendez Clinical Psychologist · Fontana, CA NPI 1003584418 Janna Casillas Psychologist · Fontana, CA NPI 1235904111 Ashley Horiuchi Counselor · Fontana, CA NPI 1386513034

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-05-07.