NPPES file of Aug 9, 2026

Koi Jan Tzeo Nguyen, RDH

Dental Hygienist · Palo Alto, CA

Koi Jan Tzeo Nguyen, RDH is a dental hygienist with a practice address in Palo Alto, California, and NPI 1326846437, issued on Mar 4, 2025. Check the license (California RDH28121, as entered in NPPES) with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1326846437
Name
Koi Jan Tzeo Nguyen
Credential
RDH
Primary taxonomy
Dental Hygienist 124Q00000X
License number
RDH28121 CA
Self-reported in NPPES; status is on the state search
Practice location
511 Byron St, Palo Alto, CA 94301
Phone
(650) 370-1234
Enumerated
Mar 4, 2025
Record last updated
Mar 4, 2025
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 511 Byron St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Jonathan HollanderDental Hygienist1366793960
  2. Robert Iverson, D.M.D.Dentist1043370299
  3. Peter Kono, DDSGeneral Practice Dentistry1215052550
  4. Thomas Kono, DDSGeneral Practice Dentistry1407569593
  5. Martha Vanzina, DDSDentist1902932429

Verify Koi Jan Tzeo Nguyen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license RDH28121    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Dental Hygienist providers in California

There are 1,874 dental hygienist records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,874 in California → Every provider in Palo Alto →

Other dental hygienist records in California

  1. Rosanne AaronsRedding, CA1801513510
  2. Marina AbarcaSherman Oaks, CA1770303505
  3. Editha AbayanDublin, CA1992081962
  4. Michelle Abboud, RDHCypress, CA1578993523
  5. Kamelia Abossaba, RDHAPDanville, CA1073495701
  6. Annette Abrao, RDHAPBenicia, CA1609284132
  7. Kathleen Mae Abueva, RDHAPLos Angeles, CA1396285300
  8. Tammi Aceres, RDHSan Bernardino, CA1609096445
  9. Celia Acevedo, RDHLone Pine, CA1164186789
  10. Nadia AcunaValencia, CA1427598176

Common questions

What is Koi Jan Tzeo Nguyen, RDH's NPI number?

Koi Jan Tzeo Nguyen, RDH's National Provider Identifier (NPI) is 1326846437, issued on Mar 4, 2025. An NPI identifies a provider in billing; it is not a license.

Where is Koi Jan Tzeo Nguyen, RDH located?

The NPPES record lists a practice address at 511 Byron St, Palo Alto, CA, 94301. Phone: (650) 370-1234. Providers update this record themselves, so call before visiting.

How can I verify Koi Jan Tzeo Nguyen, RDH's license?

NPPES lists California license number RDH28121, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.