Weber Chen, M.D.
NPI 1679504393ActiveIndividual· Internal Medicine, Hematology & Oncology· Pasadena, CA
Internal Medicine, Hematology & Oncology (M.D.) with Los Angeles Hematology-Oncology Medical Group, practicing in Pasadena, California. Their prescriptions cost Medicare Part D more than their services did: $12,784,564 for 2,580 claims, against $3,309,761 paid for services in 2024. Janssen Biotech, Inc. was the largest of 43 companies reporting payments in 2025, $6,268 in all, mostly food and beverage. Lists Alhambra Hospital Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1679504393 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 5, 2006 |
| Last updated in NPPES | Jul 21, 2021 |
| Certified by provider | Jul 21, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A85444 | CA |
| Specialist | 174400000X | A85444 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 753 |
|---|---|
| Services billed | 157,297 across 108 procedure codes |
| Paid by Medicare | $3,309,761 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,580 · 3,468 30-day fills |
|---|---|
| Patients | 376 |
| Total drug cost | $12,784,564 |
| Generic share | 47% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical group
- Los Angeles Hematology-Oncology Medical GroupVan Nuys, CA · 50 clinicians
Hospital affiliations
- Alhambra Hospital Medical CenterAlhambra, CA
- Garfield Medical CenterMonterey Park, CA
- Huntington HospitalPasadena, CA
- San Gabriel Valley Medical CenterSan Gabriel, CA
- Usc Arcadia HospitalArcadia, CA
Other facilities
- Wise Home Health IncHome health agency · San Gabriel, CA
Industry payments (Open Payments)
- 2025$6,268 · 256 payments from 43 companies
- 2024$5,240 · 222 payments from 46 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $1,142 | 31 |
| Astrazeneca Pharmaceuticals LP | $827.30 | 43 |
| Pfizer Inc. | $451.95 | 22 |
| Array Biopharma Inc | $417.92 | 18 |
| Gilead Sciences, Inc. | $286.70 | 14 |
What the 2025 payments were for
- Food and Beverage$6,228 · 253 payments
- Education$40.31 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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