Thanh-Lan Quan, MD
NPI 1831133511 · Ophthalmology Physician · Westminster, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Thanh-Lan Quan, MD is a Ophthalmology Physician provider in Westminster, CA (NPI 1831133511).
Provider details
- NPI number
- 1831133511
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- Yes
- License
- G69821 (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
4,078 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 Problem Focused Exam of Visual System92012 | 1,160 | $99 |
| Established Patient Complete Exam of Visual System92014 | 812 | $139 |
| Imaging of Optic Nerve92133 | 488 | $40 |
| Exam of Visual Field With Extended Testing92083 | 427 | $71 |
| Exam of the Internal Drainage System of Eye92020 | 213 | $30 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 191 | $138 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 46 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Bimatoprostbrand: Lumigan | 1,128 | 200 |
| Cyclosporinebrand: Restasis | 987 | 234 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 924 | 230 |
| Cyclosporine | 763 | 200 |
| Lifitegrastbrand: Xiidra | 653 | 155 |
| Latanoprost | 566 | 157 |
| Latanoprostene Bunodbrand: Vyzulta | 519 | 96 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,869 across 69 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
- 2006-06-15
- Last updated
- 2008-04-08
Frequently asked questions
- What is Thanh-Lan Quan's NPI number?
- Thanh-Lan Quan's National Provider Identifier (NPI) is 1831133511, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Thanh-Lan Quan's specialty?
- Thanh-Lan Quan is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Thanh-Lan Quan located?
- Thanh-Lan Quan's practice location on file with NPPES is 10362 Bolsa Ave, Westminster, CA 92683.
- What is Thanh-Lan Quan's phone number?
- The practice phone number listed in the NPPES registry for Thanh-Lan Quan is (714) 531-4804.
- Does Thanh-Lan Quan accept Medicare?
- Thanh-Lan Quan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Thanh-Lan Quan's NPI active?
- Yes — Thanh-Lan Quan's NPI (1831133511) is active in the NPPES registry as of the last update on 2008-04-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.