Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

James Chessing, PHD

Clinical Psychologist in San Mateo, CA · enumerated 2006.

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

National Provider Identifier

1326142407

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Registry record

Entity type Individual (Type 1)

Name James Chessing

Credential PHD

Sex Male

Practice address 334 N San Mateo Dr, San Mateo, CA, 94401

Phone (650) 342-4557

Enumeration date Sep 11, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License PSY14087 (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
9827927	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

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 James Chessing?

James Chessing is registered in NPPES with the primary taxonomy of Clinical Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Other providers at this practice address

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Christine Kenworthy Clinical Psychologist · San Mateo, CA NPI 1427479823

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.