Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Donald Niall Fallin, PSY.D.
Psychologist in Hayward, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1396724290
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Registry record
Entity type Individual (Type 1)
Name Dr. Donald Niall Fallin
Credential PSY.D.
Sex Male
Practice address 225 W Winton Ave, Suite 202, Hayward, CA, 94544
Phone (510) 783-6899
Enumeration date Jan 10, 2006
Last updated in NPPES Sep 11, 2025
Taxonomy & licenses
103T00000X Psychologist Behavioral Health & Social Service Providers · License PSY16419 (CA) Primary
PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice.
About the PSYD 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
What specialty is Donald Fallin?
Donald Fallin 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.
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.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-11.