Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Ismail Yassai, PH.D.

Psychologist in Tustin, CA · enumerated 2006.

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

National Provider Identifier

1548351489

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Registry record

Entity type Individual (Type 1)

Name Dr. Ismail Yassai

Credential PH.D.

Sex Male

Practice address 17291 Irvine Blvd, Suite 104, Tustin, CA, 92780

Phone (714) 730-0505

Fax (714) 730-0113

Enumeration date Sep 27, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY 06949 (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

Where does Ismail Yassai practice?

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

What is the NPI number for Ismail Yassai?

The National Provider Identifier (NPI) for Ismail Yassai is 1548351489, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Paul Mundt Marriage & Family Therapist · Tustin, CA NPI 1710956800 Roderick Ponath Psychiatry Physician · Tustin, CA NPI 1568669992 Luisa Acosta Speech-Language Pathologist · Tustin, CA NPI 1225266794 Maritza Plascencia Marriage & Family Therapist · Tustin, CA NPI 1790079598 Bright Star Speech-Language Pathologist · Tustin, CA NPI 1366730657 Steven Earley Marriage & Family Therapist · Tustin, CA NPI 1497001804 Tustin Elite Chiropractic Chiropractor · Tustin, CA NPI 1720421316 Magnolia Ng Chiropractor · Tustin, CA NPI 1841633393

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.