Wen-Kai Weng, MD, PHD
NPI 1659428241ActiveIndividual· Internal Medicine, Hematology & Oncology· Stanford, CA
Internal Medicine, Hematology & Oncology (MD, PHD) with Stanford Health Care, practicing in Stanford, California. 73 Medicare patients in 2024, $41,901 paid; nearly all of their 142 Part D prescriptions were generic (96%). Pfizer Inc. reported $18.66 in payments in 2025, mostly food and beverage. Lists Stanford Health Care as a hospital affiliation.
Overview
| NPI | 1659428241 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD, PHD |
| Sole proprietor | No |
| NPI issued | Jan 4, 2007 |
| Last updated in NPPES | Apr 12, 2024 |
| Certified by provider | Apr 12, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A67728 | 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 - Medical Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 73 |
|---|---|
| Services billed | 372 across 8 procedure codes |
| Paid by Medicare | $41,901 |
Part D prescriptions in 2024
| Prescriptions (claims) | 142 · 194 30-day fills |
|---|---|
| Patients | 23 |
| Total drug cost | $36,626 |
| Generic share | 96% of claims |
Education and affiliations
| Graduation year | 1988 |
|---|---|
| Medicare specialty | Medical Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Stanford Health CareStanford, CA · 3,122 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$18.66 · 1 payment from 1 company
- 2024$41.09 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $18.66 | 1 |
What the 2025 payments were for
- Food and Beverage$18.66 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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