NPPES file of Aug 9, 2026

Richard L. Nguyen, M.D.

Ophthalmology Physician · Garden Grove, CA

Richard L. Nguyen, M.D. is an ophthalmology physician with a practice address in Garden Grove, California, and NPI 1134178486, issued on May 6, 2006. Check the license (California G77473, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1134178486
Name
Richard L. Nguyen
Credential
M.D.
Primary taxonomy
Ophthalmology Physician 207W00000X
License number
G77473 CA
Self-reported in NPPES; status is on the state search
Practice location
9746 Westminster Ave, Garden Grove, CA 92844
Phone
(714) 638-4433
Enumerated
May 6, 2006
Record last updated
Feb 13, 2012 (not updated in 14 years: call before relying on the address or phone)
Fax
(715) 638-4499
Medicaid ID
00G774730 CA
Medicare enrollment
Enrolled (PECOS I20120413000387); accepts Medicare assignment
Medical or professional school
Loma Linda University School Of Medicine, 1992
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 ophthalmology physician records → All 2,899 in California → Look up another NPI →

Also registered at 9746 Westminster Ave

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

  1. Victor Dinh, M.D.Family Medicine Physician1558391052
  2. Ann Duong, D.C.Chiropractor1821175852
  3. Tam Le, MDInternal Medicine Physician1336381607
  4. Mai Thi Nguyen, DDSDentist1467878041
  5. Thuan Phan, D.C.Chiropractor1972681906

Verify Richard L. Nguyen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G77473    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
Open 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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6.7 times the Medicare Part D claims of the average ophthalmology physician in 2024

10,128 Medicare Part D claims for 1,073 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims.

  1. Richard Nguyen10,128
  2. Specialty average1,518

Most prescribed

  1. Timolol Maleate1,749 claims
  2. Latanoprost1,607 claims
  3. Brimonidine Tartrate1,242 claims
  4. Azelastine Hcl952 claims
  5. Restasis745 claims
  6. Cyclosporine532 claims

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Industry payments in 2024: $26.29

2 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Vision LLC. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Richard Nguyen$26.29
  2. Specialty average$4,535.02

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Richard L. Nguyen among 2,899 ophthalmology physician records in California

Richard L. Nguyen, M.D. is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.

  • NPI issued2006 · 9% of these records are older, 45% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 66% of these records are
  • Graduated1992 · median 2001 among the 1,907 with a school on file
  • Record last updated2012 · 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 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Ophthalmology Physician providers in California

There are 2,899 ophthalmology physician records in California.

All 2,899 in California → Every provider in Garden Grove → Ophthalmology Physician nationwide →

The 8 ophthalmology physician records with the nearest ZIP codes

  1. Paul Lee, MDGarden Grove, CA 928441003838012
  2. James Boyce, M.D.Garden Grove, CA 928431457351652
  3. Kourosh Dastgheib, MDGarden Grove, CA 928431578523593
  4. Norman Liu, M.D.Garden Grove, CA 928431861492860
  5. George Mayo, M.D.Garden Grove, CA 928431265591994
  6. Ryan Taban, M.D.Garden Grove, CA 928431235253196
  7. Elizabeth Du, M.D.Garden Grove, CA 928401730393398
  8. Eric Hwang, MDFullerton, CA 928351538620802

Common questions

What is Richard L. Nguyen, M.D.'s NPI number?

Richard L. Nguyen, M.D.'s National Provider Identifier (NPI) is 1134178486, issued on May 6, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Richard L. Nguyen, M.D. located?

The NPPES record lists a practice address at 9746 Westminster Ave, Garden Grove, CA, 92844. Phone: (714) 638-4433. Providers update this record themselves, so call before visiting.

How can I verify Richard L. Nguyen, M.D.'s license?

NPPES lists California license number G77473, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Richard L. Nguyen, M.D. prescribe under Medicare Part D?

In 2024, Richard L. Nguyen, M.D. had 10,128 Medicare Part D claims for 1,073 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions 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.