Karen Y. Nishimura, MD
NPI 1730284878ActiveIndividual· Dermatology· Roseville, CA
Dermatology (MD) in Roseville, California, licensed in CA, with an NPI issued in September 2006. 477 Medicare patients in 2024, $138,197 paid; nearly all of their 1,033 Part D prescriptions were generic (93%). Regeneron Healthcare Solutions, Inc. reported $31.35 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1730284878 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Sep 13, 2006 |
| Last updated in NPPES | Jun 8, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | A60747 | 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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 477 |
|---|---|
| Services billed | 3,088 across 45 procedure codes |
| Paid by Medicare | $138,197 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,033 · 1,297 30-day fills |
|---|---|
| Patients | 396 |
| Total drug cost | $141,544 |
| Generic share | 93% of claims |
Industry payments (Open Payments)
- 2025$31.35 · 1 payment from 1 company
- 2024$42.67 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Regeneron Healthcare Solutions, Inc. | $31.35 | 1 |
What the 2025 payments were for
- Food and Beverage$31.35 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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