Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Marina Niznik, PHD
Psychologist in Walnut Creek, CA · enumerated 2023.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1558138701
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Registry record
Entity type Individual (Type 1)
Name Dr. Marina Niznik
Credential PHD
Sex Female
Practice address 1212 Broadway Plz Ste 2100, Walnut Creek, CA, 94596
Phone (925) 818-8079
Enumeration date Dec 7, 2023
Last updated in NPPES Dec 7, 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 Marina Niznik?
Marina Niznik 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
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-12-07.