Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Stephen Michael Werk, PHD
Psychologist in San Jose, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1306898796
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Registry record
Entity type Individual (Type 1)
Name Dr. Stephen Michael Werk
Credential PHD
Sex Male
Practice address 3500 Zanker Road, San Jose, CA, 95134
Phone (408) 451-6198
Enumeration date May 16, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY11078 (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.
Frequently asked questions
How do I verify Stephen Werk's NPI record?
Cross-check NPI 1306898796 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1306898796 active?
Yes, as of the latest NPPES snapshot, NPI 1306898796 is active (record last updated 2007-07-08).
Other providers at this practice address
Browse all → Emiliano Ramos Internal Medicine Physician · San Jose, CA NPI 1699727867 Dai Vu General Practice Physician · San Jose, CA NPI 1043262843 Terry Tang Psychologist · San Jose, CA NPI 1861444663 Melissa Llabres Psychologist · San Jose, CA NPI 1629020409 Sepideh Katz Psychologist · San Jose, CA NPI 1013960103 Glory Denkers Psychologist · San Jose, CA NPI 1346282704
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.