Quick answers
- Does Joanna L. Nguyen accept Medicare assignment?
- Yes. Medicare's clinician data says Joanna L. Nguyen 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 Joanna L. Nguyen see?
- In 2024, CMS data shows 102 Original Medicare patients and 2,752 services for Joanna L. Nguyen. This counts Original Medicare only and measures volume, not quality.
- What is Joanna L. Nguyen's NPI number?
- 1962808915. 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 Joanna L. Nguyen, 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 | 102 |
|---|---|
| Services billed to Medicare | 2,752 |
| Different services or procedures | 22 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)66 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)60 services
- Biopsy of related skin growth, first growth (11102)21 services
- Destruction of precancer skin growth, 1 growth (17000)19 services
- Destruction of skin growth, 1-14 growths (17110)19 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 cholesterol65%
- High blood pressure59%
- Arthritis40%
- Atrial fibrillation21%
- Osteoporosis19%
- Ischemic heart disease18%
Practice locations
Addresses where Joanna L. Nguyen is enrolled with Medicare (CMS data updated October 2, 2026).
- 2835 82nd Ave SE, Suite 210Mercer Island, WA 98040 (206) 236‑3030
Group practices
Medicare enrollment lists Joanna L. Nguyen as a member of this group (CMS data updated October 2, 2026).
- Mercer Island Dermatology PLLC3 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Washington
Clinicians with the same Medicare primary specialty in Washington — not a recommendation.
Other clinicians in Mercer Island Dermatology PLLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2014 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962808915 |
| 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