Richard Nguyen, M.D.
NPI 1134178486 · Ophthalmology Physician · Garden Grove, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Richard Nguyen, M.D. is a Ophthalmology Physician provider in Garden Grove, CA (NPI 1134178486).
Provider details
- NPI number
- 1134178486
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G77473 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
989 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 673 | $124 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 228 | $173 |
| Ultrasound Scan to Determine Eye Length and Lens Power76519 | 54 | $38 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 18 | $99 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 16 | $584 |
Typical Medicare-allowed amounts for these services range $38–$584 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 43 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Timolol Maleate | 1,749 | 289 |
| Latanoprost | 1,607 | 260 |
| Brimonidine Tartrate | 1,242 | 252 |
| Azelastine Hcl | 952 | 227 |
| Cyclosporinebrand: Restasis | 745 | 131 |
| Cyclosporine | 532 | 120 |
| Ketorolac Tromethamine | 492 | 143 |
| Fluorometholone | 368 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$26 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-06
- Last updated
- 2012-02-13
Frequently asked questions
- What is Richard Nguyen's NPI number?
- Richard Nguyen's National Provider Identifier (NPI) is 1134178486, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Richard Nguyen's specialty?
- Richard Nguyen is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Richard Nguyen located?
- Richard Nguyen's practice location on file with NPPES is 9746 Westminster Ave, Garden Grove, CA 92844-2984.
- What is Richard Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Richard Nguyen is (714) 638-4433.
- Does Richard Nguyen accept Medicare?
- Richard Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Richard Nguyen's NPI active?
- Yes — Richard Nguyen's NPI (1134178486) is active in the NPPES registry as of the last update on 2012-02-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.