Quick answers
- Does Gwen L. Bui accept Medicare assignment?
- Yes. Medicare's clinician data says Gwen L. Bui 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 Gwen L. Bui see?
- In 2024, CMS data shows 23 Original Medicare patients and 47 services for Gwen L. Bui. This counts Original Medicare only and measures volume, not quality.
- What is Gwen L. Bui's NPI number?
- 1902269525. 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 Gwen L. Bui, 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 | 23 |
|---|---|
| Services billed to Medicare | 47 |
| Different services or procedures | 9 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Photography of the retina (92250)14 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)12 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 cholesterol70%
- High blood pressure48%
Practice locations
Addresses where Gwen L. Bui is enrolled with Medicare (CMS data updated October 2, 2026).
- 4000 NE Sandy BlvdPortland, OR 97212 (503) 477‑4074
- 9201 SE 91st Ave, Suite 130Clackamas, OR 97086 (503) 775‑2424
Group practices
Medicare enrollment lists Gwen L. Bui as a member of this group (CMS data updated October 2, 2026).
- River City Eyecare LLC3 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Portland
Clinicians with the same Medicare primary specialty in Portland, OR — not a recommendation.
Other clinicians in River City Eyecare LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Pacific University - College Of Optometry |
| Graduation year | 2017 (9 years since optometry school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902269525 |
| 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