NPPES file of Aug 9, 2026

Cathy Linh Nguyen, O.D.

Optometrist · Fontana, CA

Cathy Linh Nguyen, O.D. is an optometrist with a practice address in Fontana, California, and NPI 1912260878, issued on Jun 15, 2012. Check the license (California 14390, 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
1912260878
Name
Cathy Linh Nguyen
Credential
O.D.
Primary taxonomy
Optometrist 152W00000X
License number
14390 CA
Self-reported in NPPES; status is on the state search
Practice location
8190 Mango Ave, Fontana, CA 92335
Phone
(909) 350-2020
Enumerated
Jun 15, 2012
Record last updated
Jan 18, 2022
Fax
(909) 350-2341
Medicare enrollment
Enrolled (PECOS I20120808000157); accepts Medicare assignment
Medical or professional school
Southern California College Of Optometry, 2012
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 8190 Mango Ave

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

  1. Wendy Duncan, ODOptometrist1538152145
  2. Matthew Enos, O.D.Optometrist1134560477

Verify Cathy Linh 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 14390    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. Cathy Nguyen OD A Professional Optometric CorporationFontana, CA

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

Cathy Linh Nguyen among 8,308 optometrist records in California

Cathy Linh Nguyen, O.D. 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 2012, is newer than 64% of them.

  • NPI issued2012 · 64% of these records are older, 34% newer
  • In a Medicare fileYes · 67% of these records are
  • In the CMS Doctors and Clinicians fileYes · 43% of these records are
  • Graduated2012 · median 2008 among the 3,573 with a school on file
  • Record last updated2022 · 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).

52 optometrist records list a practice address in Fontana

They are 52 of the 3,012 NPPES records with a practice address in Fontana, and 8,308 optometrist records in California.

All 8,308 in California → Every provider in Fontana → Optometrist nationwide →

The 8 optometrist records with the nearest ZIP codes

  1. Christopher Albaugh, ODFontana, CA 923351720155567
  2. Arlene Arcega, ODFontana, CA 923351093882839
  3. Gary Byers, ODFontana, CA 923351629145479
  4. Kelly Delange, ODFontana, CA 923351285701029
  5. Wendy Duncan, ODFontana, CA 923351538152145
  6. Michael Ferreri, ODFontana, CA 923351245307099
  7. Frank Grigsby, ODFontana, CA 923351902973746
  8. Gary Jacobson, ODFontana, CA 923351073680815

Common questions

What is Cathy Linh Nguyen, O.D.'s NPI number?

Cathy Linh Nguyen, O.D.'s National Provider Identifier (NPI) is 1912260878, issued on Jun 15, 2012. An NPI identifies a provider in billing; it is not a license.

Where is Cathy Linh Nguyen, O.D. located?

The NPPES record lists a practice address at 8190 Mango Ave, Fontana, CA, 92335. Phone: (909) 350-2020. Providers update this record themselves, so call before visiting.

How can I verify Cathy Linh Nguyen, O.D.'s license?

NPPES lists California license number 14390, 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.