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

Matthew Tarran, PH.D.

Addiction (Substance Use Disorder) Psychologist in Cupertino, CA · enumerated 2006 · practices at Kaiser Foundation Health Plan Inc.

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

National Provider Identifier

1245395680

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Registry record

Entity type Individual (Type 1)

Name Matthew Tarran

Credential PH.D.

Sex Male

Practice address Cupertino, CA, 95014

Phone (408) 366-4215

Fax (408) 366-4201

Enumeration date Dec 26, 2006

Last updated in NPPES Feb 11, 2022

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

Taxonomy & licenses

103TA0400X Addiction (Substance Use Disorder) Psychologist Behavioral Health & Social Service Providers · License PSY12459 (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.

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Frequently asked questions

What specialty is Matthew Tarran?

Matthew Tarran is registered in NPPES with the primary taxonomy of Addiction (Substance Use Disorder) Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-02-11.