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

Dr. Gregory Edmund Hamlin

Clinical Psychologist in Santa Clarita, CA · enumerated 2013.

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

National Provider Identifier

1609113042

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. Gregory Edmund Hamlin

Sex Male

Practice address Santa Clarita, CA, 91355

Phone (661) 297-2326

Fax (661) 310-0075

Enumeration date Jan 4, 2013

Last updated in NPPES Jan 4, 2013

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

Taxonomy & licenses

103TB0200X Cognitive & Behavioral Psychologist Behavioral Health & Social Service Providers · License PSY16871 (CA) Secondary

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License PSY16871 (CA) Primary

103TC2200X Clinical Child & Adolescent Psychologist Behavioral Health & Social Service Providers · License PSY16871 (CA) Secondary

103TF0000X Family Psychologist Behavioral Health & Social Service Providers · License PSY16871 (CA) Secondary

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 Gregory Hamlin?

The National Provider Identifier (NPI) for Gregory Hamlin is 1609113042, a Type 1 (individual) record in the CMS NPPES registry.

Where does Gregory Hamlin practice?

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

Other providers at this practice address

Browse all →

Jo Ann Fields Marriage & Family Therapist · Santa Clarita, CA NPI 1609801372 Tracy Gordon Clinical Social Worker · Valencia, CA NPI 1720102155 Julianne Carlson Marriage & Family Therapist · Santa Clarita, CA NPI 1306038500 Manjit Walia Clinical Psychologist · Valencia, CA NPI 1659565398 Nicole Penick Psychologist · Valencia, CA NPI 1568003077

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-01-04.