Diane C. Tsai, M.D.
NPI 1730266966ActiveIndividual· Radiology, Radiation Oncology· Portland, OR
Radiology, Radiation Oncology (M.D.) with Kaiser Foundation Health Plan of the Northwest and 3 other groups, practicing in Portland, Oregon. 61 Medicare patients in 2024, $172,173 paid; nearly all of their 170 Part D prescriptions were generic (95%). Siemens Medical Solutions USA, Inc. reported $25.91 in payments in 2024, mostly food and beverage. Lists Community Hospital of the Monterey Peninsula and 1 other hospital as hospital affiliations.
Overview
| NPI | 1730266966 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 1, 2006 |
| Last updated in NPPES | Dec 9, 2025 |
| Certified by provider | Dec 9, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Radiation Oncology Primary | 2085R0001X | MD174455 | OR |
| Radiology, Radiation Oncology | 2085R0001X | G86931 | CA |
| Radiology, Radiation Oncology | 2085R0001X | MD00037303 | WA |
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 - Radiation Oncology (CA); Practitioner - Radiation Oncology (OR); Practitioner - Radiation Oncology (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 61 |
|---|---|
| Services billed | 974 across 24 procedure codes |
| Paid by Medicare | $172,173 |
Part D prescriptions in 2024
| Prescriptions (claims) | 170 · 216 30-day fills |
|---|---|
| Patients | 67 |
| Total drug cost | $4,491 |
| Generic share | 95% of claims |
Education and affiliations
| Graduation year | 1991 |
|---|---|
| Medicare specialty | Radiation Oncology |
Medical groups
- Kaiser Foundation Health Plan of the NorthwestSalem, OR · 1,807 clinicians
- PeacehealthBellingham, WA · 298 clinicians
- Providence Health and Services - WashingtonWalla Walla, WA · 270 clinicians
- Community Hospital of the Monterey PeninsulaMonterey, CA · 146 clinicians
Hospital affiliations
- Community Hospital of the Monterey PeninsulaMonterey, CA
- Providence St Mary Medical CenterWalla Walla, WA
Industry payments (Open Payments)
- 2024$25.91 · 1 payment from 1 company
Top paying companies in 2024
| Company | Amount | Payments |
|---|---|---|
| Siemens Medical Solutions USA, Inc. | $25.91 | 1 |
What the 2024 payments were for
- Food and Beverage$25.91 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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