Quick answers
- Does Thanh Lan T. Quan accept Medicare assignment?
- Yes. Medicare's clinician data says Thanh Lan T. Quan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Thanh Lan T. Quan see?
- In 2024, CMS data shows 1,342 Original Medicare patients and 4,156 services for Thanh Lan T. Quan. This counts Original Medicare only and measures volume, not quality.
- What is Thanh Lan T. Quan's NPI number?
- 1831133511. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Thanh Lan T. Quan, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 1,342 |
|---|---|
| Services billed to Medicare | 4,156 |
| Different services or procedures | 36 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient problem focused exam of visual system (92012)1,160 services
- Established patient complete exam of visual system (92014)812 services
- Imaging of optic nerve (92133)488 services
- Exam of visual field with extended testing (92083)427 services
- Exam of the internal drainage system of eye (92020)213 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Diabetes54%
- Arthritis50%
- Chronic kidney disease37%
- Osteoporosis37%
Practice locations
Addresses where Thanh Lan T. Quan is enrolled with Medicare (CMS data updated October 2, 2026).
- 10362 Bolsa Ave, Suite 201Westminster, CA 92683 (714) 531‑4804
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Westminster
Clinicians with the same Medicare primary specialty in Westminster, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, Geffen School Of Medicine |
| Graduation year | 1989 (37 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831133511 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians