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

Jonathan Brown, PHD, MFT

Psychologist in Mill Valley, CA · enumerated 2019.

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

National Provider Identifier

1508426958

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Registry record

Entity type Individual (Type 1)

Name Jonathan Brown

Credential PHD, MFT

Sex Male

Practice address Mill Valley, CA, 94941

Phone (415) 383-2990

Enumeration date Jun 18, 2019

Last updated in NPPES Jun 18, 2019

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 PSY14513 Secondary

103TF0000X Family Psychologist Behavioral Health & Social Service Providers · License PSY14513 Secondary

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY14513 (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

How do I verify Jonathan Brown's NPI record?

Cross-check NPI 1508426958 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1508426958 active?

Yes — as of the latest NPPES snapshot, NPI 1508426958 is active (record last updated 2019-06-18).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-06-18.