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

Alexandra Matthews, PH.D.

Cognitive & Behavioral Psychologist in Mill Valley, CA · enumerated 2016.

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

National Provider Identifier

1679926786

Verified

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Registry record

Entity type Individual (Type 1)

Name Alexandra Matthews

Credential PH.D.

Sex Female

Practice address Mill Valley, CA, 94941

Phone (415) 388-0800

Enumeration date Jul 14, 2016

Last updated in NPPES Jul 14, 2016

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

Taxonomy & licenses

103G00000X Clinical Neuropsychologist Behavioral Health & Social Service Providers · License PSY16219 (CA) Secondary

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers · License PSY16219 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Alexandra Matthews?

The National Provider Identifier (NPI) for Alexandra Matthews is 1679926786, a Type 1 (individual) record in the CMS NPPES registry.

Where does Alexandra Matthews practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-07-14.