Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum
Sharon Gerstenzang
Clinical Psychologist in Fountain Valley, CA · enumerated 2011 · authorized official Sharon Gerstenzang, Psychologist, Founder.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1245528447
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Registry record
Taxonomy & classification
Authorized official
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.
Frequently asked questions
Who is the authorized official for Sharon Gerstenzang?
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-10-14.