Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Hanna Yun-Han Chang, PHD
Psychologist in Sunnyvale, CA · enumerated 2019.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1689232647
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Registry record
Entity type Individual (Type 1)
Name Dr. Hanna Yun-Han Chang
Credential PHD
Sex Female
Practice address 710 Lakeway Dr Ste 200, Sunnyvale, CA, 94085
Phone (408) 372-6205
Enumeration date Jun 4, 2019
Last updated in NPPES Feb 17, 2023
Taxonomy & licenses
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.
Frequently asked questions
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Hanna Chang?
Hanna Chang is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Beyond Psychotherapy, Inc. Mental Health Clinic/Center (Including Community Mental Health Center) · Sunnyvale, CA NPI 1841825296 Smb Medical Group Ca, P.C. Family Medicine Physician · Sunnyvale, CA NPI 1770336596 Rise Sleep Medical Group West PC Cognitive & Behavioral Psychologist · Sunnyvale, CA NPI 1033949276 Bashir Raboye Driver · Sunnyvale, CA NPI 1972436939
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-02-17.