Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gwendolyn Clair Carlson, PHD

Psychologist in North Hills, CA · enumerated 2020.

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

National Provider Identifier

1689206229

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Registry record

Entity type Individual (Type 1)

Name Dr. Gwendolyn Clair Carlson

Credential PHD

Sex Female

Practice address 16111 Plummer St, North Hills, CA, 91343

Phone (818) 891-7711

Enumeration date Feb 11, 2020

Last updated in NPPES Feb 11, 2020

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY31487 (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

Is NPI 1689206229 active?

Yes, as of the latest NPPES snapshot, NPI 1689206229 is active (record last updated 2020-02-11).

How do I verify Gwendolyn Carlson's NPI record?

Cross-check NPI 1689206229 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-02-11.