Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Ryan O Chadderton, PSYD.

Marriage & Family Therapist in Garden Grove, CA · enumerated 2007.

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

National Provider Identifier

1609998335

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Registry record

Entity type Individual (Type 1)

Name Mr. Ryan O Chadderton

Credential PSYD.

Sex Male

Practice address 10331 Stanford Ave, Garden Grove, CA, 92840

Phone (714) 663-6391

Enumeration date Apr 4, 2007

Last updated in NPPES Nov 20, 2025

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers Secondary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 128398 (CA) Primary

225400000X Rehabilitation Practitioner Respiratory, Developmental, Rehabilitative and Restorative Service Providers Secondary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD 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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Ryan Chadderton?

Ryan Chadderton is registered in NPPES with the primary taxonomy of Marriage & Family Therapist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-20.