Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. George Koumaras, PHD

Psychologist in San Marcos, CA · enumerated 2006.

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

National Provider Identifier

1154377901

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Registry record

Entity type Individual (Type 1)

Name Dr. George Koumaras

Credential PHD

Sex Male

Practice address 277 Rancheros Dr Ste 301, San Marcos, CA, 92069

Phone (760) 471-4073

Fax (619) 528-4625

Enumeration date May 25, 2006

Last updated in NPPES May 6, 2021

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers 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

Is NPI 1154377901 active?

Yes, as of the latest NPPES snapshot, NPI 1154377901 is active (record last updated 2021-05-06).

How do I verify George Koumaras's NPI record?

Cross-check NPI 1154377901 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 2021-05-06.