Robert Ra Nien Tseng, MD
NPI 1053371559ActiveIndividual· Internal Medicine, Nephrology· Daly City, CA
Internal Medicine, Nephrology (MD) in Daly City, California, trained at Hahnemann University College of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $576,593 for 2,911 claims, against $276,700 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 17 companies reporting payments in 2025, $1,542 in all, mostly food and beverage.
Overview
| NPI | 1053371559 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Mar 27, 2006 |
| Last updated in NPPES | Dec 26, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A66496 | 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 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 514 |
|---|---|
| Services billed | 2,616 across 49 procedure codes |
| Paid by Medicare | $276,700 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,911 · 6,284 30-day fills |
|---|---|
| Patients | 331 |
| Total drug cost | $576,593 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | Hahnemann University College of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- North East Medical ServicesSouth San Francisco, CA · 143 clinicians
- West Coast KidneyDaly City, CA · 56 clinicians
Hospital affiliations
- Ahmc Seton Medical CenterDaly City, CA
- California Pacific Medical Center - Mission BernalSan Francisco, CA
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA
- Peninsula Medical CenterBurlingame, CA
- UCSF Health St. Mary's HospitalSan Francisco, CA
Other facilities
- Davita Colma DialysisDialysis facility · Colma, CA
- Davita San Bruno DialysisDialysis facility · San Bruno, CA
- Davita San Mateo Mills DialysisDialysis facility · San Mateo, CA
Industry payments (Open Payments)
- 2025$1,542 · 57 payments from 17 companies
- 2024$1,119 · 46 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $262.97 | 10 |
| Novartis Pharmaceuticals Corporation | $254.82 | 9 |
| Novo Nordisk Inc | $225.16 | 6 |
| Mallinckrodt Hospital Products Inc. | $162.86 | 7 |
| Amgen Inc. | $122.61 | 5 |
What the 2025 payments were for
- Food and Beverage$1,542 · 57 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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