Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gulistan Ilze Sonmez

Behavior Analyst in San Bruno, CA · enumerated 2018.

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

National Provider Identifier

1235609843

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Registry record

Entity type Individual (Type 1)

Name Gulistan Ilze Sonmez

Sex Female

Practice address 901 Sneath Ln Ste 105, San Bruno, CA, 94066

Phone (650) 515-9882

Enumeration date Nov 27, 2018

Last updated in NPPES Feb 27, 2020

Taxonomy & licenses

103K00000X Behavior Analyst Behavioral Health & Social Service Providers Secondary

103K00000X Behavior Analyst Behavioral Health & Social Service Providers · License 1-20-40668 (CA) Primary

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 Gulistan Ilze Sonmez practice?

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

What is the NPI number for Gulistan Ilze Sonmez?

The National Provider Identifier (NPI) for Gulistan Ilze Sonmez is 1235609843, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-02-27.