William Chen, MD
Internal Medicine · San Pablo, CANPI 1851498372
Payments from drug & device makers
Across 386 payments — averaging $19.96 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AstraZeneca$2K
- Amarin Pharma, Inc.$1K
- Pfizer$1K
- Novo Nordisk$769
- Sumitomo Pharma America, Inc.$500
- AbbVie$391
- plus $2K from 23 others
What the payments were for
- Food & beverage$7,52698%
- Education$1772%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| AstraZeneca | 60 | $1,832 |
| Amarin Pharma, Inc. | 57 | $1,231 |
| Pfizer | 36 | $1,129 |
| Novo Nordisk | 71 | $769 |
| Sumitomo Pharma America, Inc. | 56 | $500 |
| AbbVie(2 entities) | 20 | $391 |
| Sunovion Pharmaceuticals Inc. | 22 | $326 |
| Amgen | 15 | $290 |
| Astellas Pharma US Inc | 6 | $178 |
| Madrigal Pharmaceuticals | 3 | $177 |
| GSK | 6 | $162 |
| Lilly USA, LLC | 7 | $155 |
| Boehringer Ingelheim | 3 | $73 |
| Ironwood Pharmaceuticals, Inc | 4 | $70 |
| Kowa Pharmaceuticals America, Inc. | 2 | $51 |
| Johnson & Johnson | 2 | $45 |
| Sanofi-aventis U.S. LLC | 2 | $39 |
| Philips North America LLC | 1 | $33 |
| Biohaven Pharmaceutical Holding Company Ltd. | 1 | $30 |
| Takeda Pharmaceuticals U.S.A., Inc. | 1 | $28 |
| Merck | 2 | $28 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 2 | $27 |
| Radius Health, Inc. | 1 | $25 |
| Biohaven Pharmaceuticals, Inc. | 1 | $25 |
| Sanofi | 1 | $22 |
| Roche Diagnostics Corporation | 1 | $22 |
| Portola Pharmaceuticals, LLC | 1 | $18 |
| Ardelyx, Inc. | 1 | $16 |
| Electromed, Inc. | 1 | $12 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
How this compares
$7,703 in reported general payments places this provider in the 90th percentile of 13,581 internal medicine providers in California.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| JardianceEmpagliflozin | 141 | $216,037 |
| EliquisApixaban | 169 | $183,943 |
| RybelsusSemaglutide | 89 | $127,471 |
| JanuviaSitagliptin Phosphate | 102 | $111,795 |
| Trelegy ElliptaFluticasone/Umeclidin/Vilanter | 126 | $89,206 |
| TrulicityDulaglutide | 81 | $82,853 |
| LinzessLinaclotide | 108 | $75,505 |
| XareltoRivaroxaban | 61 | $60,290 |
| MyrbetriqMirabegron | 87 | $59,130 |
| GemtesaVibegron | 51 | $57,865 |
| FarxigaDapagliflozin Propanediol | 51 | $56,957 |
| TezspireTezepelumab-Ekko | 14 | $53,577 |
| OzempicSemaglutide | 59 | $50,954 |
| Breztri AerosphereBudesonide/Glycopyr/Formoterol | 70 | $44,884 |
| TradjentaLinagliptin | 33 | $31,759 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Boehringer IngelheimJardiance, Tradjenta, Combivent Respimat | $73 | $259,666200 claims |
| PfizerEliquis | $1,129 | $183,943169 claims |
| Novo NordiskRybelsus, Ozempic | $769 | $178,425148 claims |
| AstraZenecaFarxiga, Tezspire, Breztri Aerosphere, Bevespi Aerosphere, Symbicort | $1,832 | $173,277187 claims |
| MerckJanuvia, Belsomra | $28 | $127,549139 claims |
| GSKTrelegy Ellipta, Anoro Ellipta, Breo Ellipta | $162 | $124,686197 claims |
| Lilly USA, LLCTrulicity, Mounjaro | $155 | $96,12394 claims |
| AbbVieLinzess | $391 | $75,505108 claims |
| Johnson & JohnsonXarelto | $45 | $60,29061 claims |
| Astellas Pharma US IncMyrbetriq | $178 | $59,13087 claims |
| Sumitomo Pharma America, Inc.Gemtesa | $500 | $57,86551 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 90th percentile of 13,581 internal medicine providers in California.
Other internal medicine in San Pablo
- Andrew ChengSouth San Francisco$55.1M
- Joel NeutelTustin$34.9M
- Donald BrandonSan Diego$34M
- William TownerLos Angeles$27.4M
- Rahul AggarwalSan Francisco$24M
- Masoud AzizadNorthridge$21.1M
- Helen StaceyWalnut Creek$20.4M
- Rohit Loombala Jolla$15.1M
- Zeid KayaliColton$14.2M
- Alexandra DrakakiSanta Monica$14.2M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.