Karen Y. Chen, PA
NPI 1891374963ActiveIndividual· Physician Assistant· Fremont, CA
Physician Assistant (PA) in Fremont, California, licensed in CA, with an NPI issued in April 2021. 115 Medicare patients in 2024, $22,359 paid; nearly all of their 210 Part D prescriptions were generic (94%). Organon LLC was the largest of 15 companies reporting payments in 2025, $3,101 in all, mostly food and beverage.
Overview
| NPI | 1891374963 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA |
| Sole proprietor | No |
| NPI issued | Apr 6, 2021 |
| Last updated in NPPES | Jan 19, 2023 |
| Certified by provider | Jan 19, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 60110 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Physician Assistant (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 115 |
|---|---|
| Services billed | 386 across 31 procedure codes |
| Paid by Medicare | $22,359 |
Part D prescriptions in 2024
| Prescriptions (claims) | 210 · 242 30-day fills |
|---|---|
| Patients | 106 |
| Total drug cost | $31,233 |
| Generic share | 94% of claims |
Industry payments (Open Payments)
- 2025$3,101 · 81 payments from 15 companies
- 2024$5,092 · 117 payments from 16 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Organon LLC | $421.68 | 5 |
| Incyte Corporation | $413.04 | 10 |
| Leo Pharma Inc. | $412.90 | 14 |
| Galderma Laboratories, L.P. | $372.98 | 8 |
| Abbvie Inc. | $296.12 | 8 |
What the 2025 payments were for
- Food and Beverage$3,091 · 80 payments
- Education$9.65 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other physician assistants in Fremont
- 1053771584
- 1194759704
- 1205566841
- 1326778093
- 1366694630
- 1376763698
- 1972132108
- 1235806621
- 1255317350
- 1265143531
- 1396788675
- 1427577642
All 73 physician assistants in Fremont · All physician assistants in California