Joseph Sze-Tsu Chan, M.D.
NPI 1497796189ActiveIndividual· Internal Medicine, Hematology & Oncology· Fontana, CA
Internal Medicine, Hematology & Oncology (M.D.) in Fontana, California, trained at Vanderbilt University School of Medicine (class of 2001). Their prescriptions cost Medicare Part D more than their services did: $6,103,646 for 2,178 claims, against $119,357 paid for services in 2024. Astrazeneca Pharmaceuticals LP reported $67.61 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1497796189 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 10, 2006 |
| Last updated in NPPES | Nov 29, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A99860 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 32 |
|---|---|
| Services billed | 6,204 across 52 procedure codes |
| Paid by Medicare | $119,357 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,178 · 3,611 30-day fills |
|---|---|
| Patients | 403 |
| Total drug cost | $6,103,646 |
| Generic share | 80% of claims |
Education and affiliations
| Medical school | Vanderbilt University School of Medicine |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical group
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
Hospital affiliations
- Kaiser Foundation Hospital Fontana/OntarioFontana, CA
- San Antonio Regional HospitalUpland, CA
Industry payments (Open Payments)
- 2025$67.61 · 1 payment from 1 company
- 2024$88.97 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $67.61 | 1 |
What the 2025 payments were for
- Food and Beverage$67.61 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Hematology & Oncology providers in Fontana
- 1467511030
- 1134296973
- 1396944674
- 1184791196
- 1053469007
- 1598832305
- 1073680823
All Internal Medicine, Hematology & Oncology providers in California →