Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Tracy Nguyen, OD
Optometrist in Livermore, CA · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1659857910
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Registry record
Entity type Individual (Type 1)
Name Tracy Nguyen
Credential OD
Sex Female
Practice address 2700 Las Positas Rd, Livermore, CA, 94551
Phone (925) 315-5659
Enumeration date Jul 19, 2018
Last updated in NPPES Oct 15, 2020
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD 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 Tracy Nguyen's NPI record?
Cross-check NPI 1659857910 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1659857910 active?
Yes, as of the latest NPPES snapshot, NPI 1659857910 is active (record last updated 2020-10-15).
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-10-15.