NPPES file of Aug 9, 2026

William Doan Nguyen, OD

Optometrist · San Francisco, CA

William Doan Nguyen, OD is an optometrist with a practice address in San Francisco, California, and NPI 1689564486, issued on Jul 4, 2025. Check the license (California 36323, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

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

NPPES recordNPPES file of Aug 9, 2026
1689564486
Name
William Doan Nguyen
Credential
OD
Primary taxonomy
Optometrist 152W00000X
License numbers
36323 CA
011250 NY
Self-reported in NPPES; status is on the state search
Practice location
490 Illinois St, San Francisco, CA 94158
Phone
(415) 530-6123
Enumerated
Jul 4, 2025
Record last updated
Jul 17, 2026
Medicare enrollment
Enrolled (PECOS I20251013000318); may accept Medicare assignment
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest optometrist records → All 8,308 in California → Look up another NPI →

Also registered at 490 Illinois St

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

  1. Sugeile Benavidez QuezadaLicensed Vocational Nurse1285594531
  2. Samantha Chan, ODOptometrist1861179806
  3. Michael Chang, ODOptometrist1811792435
  4. Samya GhuloumStudent in an Organized Health Care Education/Training Program1851240840
  5. Britney Kitamata-Wong, ODOptometrist1467804922
  6. Kristina Lin, MDOptometrist1518535855

Verify William Doan 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 36323    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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Bills Medicare through one group practice

  1. State OF New York Comptrollers OfficeNew York, NY

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

William Doan Nguyen among 8,308 optometrist records in California

William Doan Nguyen, OD is one of 8,308 optometrist records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2025, is newer than 96% of them.

  • NPI issued2025 · 96% of these records are older, 1% newer
  • In a Medicare fileYes · 67% of these records are
  • In the CMS Doctors and Clinicians fileYes · 43% of these records are
  • Graduated2025 · median 2008 among the 3,573 with a school on file
  • Record last updated2026 · 67% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Optometrist providers in California

There are 8,308 optometrist records in California.

All 8,308 in California → Every provider in San Francisco → Optometrist nationwide →

The 8 optometrist records with the nearest ZIP codes

  1. Christine Brischer, O.D.San Francisco, CA 941581053376541
  2. Samantha Chan, ODSan Francisco, CA 941581861179806
  3. Michael Chang, ODSan Francisco, CA 941581811792435
  4. Lakshmisahithi Jaeel, ODSan Francisco, CA 941581366173718
  5. Ashby Jones, O.D.San Francisco, CA 941581194789651
  6. Britney Kitamata-Wong, ODSan Francisco, CA 941581467804922
  7. Kristina Lin, MDSan Francisco, CA 941581518535855
  8. Muhammad Muhanna, ODSan Francisco, CA 941581891641007

Common questions

What is William Doan Nguyen, OD's NPI number?

William Doan Nguyen, OD's National Provider Identifier (NPI) is 1689564486, issued on Jul 4, 2025. An NPI identifies a provider in billing; it is not a license.

Where is William Doan Nguyen, OD located?

The NPPES record lists a practice address at 490 Illinois St, San Francisco, CA, 94158. Phone: (415) 530-6123. Providers update this record themselves, so call before visiting.

How can I verify William Doan Nguyen, OD's license?

NPPES lists California license number 36323, 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. Medicare files from data.cms.gov. 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.