Randolph A. Chen, MD
NPI 1962502872ActiveIndividual· Internal Medicine, Nephrology· Belmont, CA
Internal Medicine, Nephrology (MD) in Belmont, California, trained at Wake Forest University School of Medicine (class of 1999). Their prescriptions cost Medicare Part D more than their services did: $290,386 for 2,241 claims, against $181,812 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 9 companies reporting payments in 2025, $1,135 in all, mostly food and beverage.
Overview
| NPI | 1962502872 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Sep 22, 2006 |
| Last updated in NPPES | May 16, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A37526 | 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 | 380 |
|---|---|
| Services billed | 1,205 across 12 procedure codes |
| Paid by Medicare | $181,812 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,241 · 5,885 30-day fills |
|---|---|
| Patients | 378 |
| Total drug cost | $290,386 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Wake Forest University School of Medicine |
|---|---|
| Graduation year | 1999 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Nephrology |
Medical groups
- County of San MateoSan Mateo, CA · 310 clinicians
- San Mateo Dialysis AssociatesBurlingame, CA · 7 clinicians
Hospital affiliations
- Ahmc Seton Medical CenterDaly City, CA
- Peninsula Medical CenterBurlingame, CA
- San Mateo Medical CenterSan Mateo, CA
Other facilities
- Shc Daly CityDialysis facility · Daly City, CA
- Shc San CarlosDialysis facility · San Carlos, CA
- Shc San MateoDialysis facility · San Mateo, CA
- Shc Wb Daly CityDialysis facility · Daly City, CA
- Shc Wb San MateoDialysis facility · San Mateo, CA
Industry payments (Open Payments)
- 2025$1,135 · 31 payments from 9 companies
- 2024$5,593 · 47 payments from 10 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $557.28 | 17 |
| Novo Nordisk Inc | $138.66 | 2 |
| Nxstage Medical, Inc. | $130.77 | 1 |
| Bayer Healthcare Pharmaceuticals Inc. | $114.71 | 5 |
| Amgen Inc. | $58.06 | 2 |
What the 2025 payments were for
- Food and Beverage$1,135 · 31 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records