Gary Chan
Internal Medicine · San Francisco, CANPI 1699702324
Payments from drug & device makers
Across 85 payments — averaging $21.29 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Daiichi Sankyo Inc.$315
- Amgen$265
- Viiv Healthcare Company$227
- Gilead$216
- Sanofi-aventis U.S. LLC$205
- Novartis$88
- plus $493 from 14 others
What the payments were for
- Food & beverage$1,810100%
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 |
|---|---|---|
| Daiichi Sankyo Inc. | 17 | $315 |
| Amgen | 3 | $265 |
| Viiv Healthcare Company | 18 | $227 |
| Gilead | 9 | $216 |
| Sanofi-aventis U.S. LLC | 5 | $205 |
| Novartis | 5 | $88 |
| AbbVie | 3 | $71 |
| Lilly USA, LLC | 3 | $57 |
| Merck | 3 | $53 |
| AstraZeneca | 3 | $52 |
| Boehringer Ingelheim | 3 | $41 |
| Novo Nordisk | 2 | $35 |
| GSK | 1 | $31 |
| Pfizer | 2 | $30 |
| Johnson & Johnson | 2 | $30 |
| Mannkind Corporation | 2 | $30 |
| Astellas Pharma US Inc | 1 | $24 |
| Vyera Pharmaceuticals, LLC | 1 | $16 |
| Arbor Pharmaceuticals, Inc. | 1 | $12 |
| Biodelivery Sciences International, Inc. | 1 | $11 |
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.
- Tavneos$247
How this compares
$1,810 in reported general payments places this provider in the 80th percentile of 13,581 internal medicine providers in California.
Other internal medicine in San Francisco
- Rahul AggarwalSan Francisco$24M
- Thomas MartinSan Francisco$13.7M
- Peter HuntSan Francisco$9.8M
- Diane HavlirSan Francisco$8.4M
- Sandy WongSan Francisco$6.6M
- Nina ShahSan Francisco$5.4M
- Katy TsaiSan Francisco$3.8M
- Riley BoveSan Francisco$3.6M
- Jacob LalezariSan Francisco$3.3M
- Flavio VincentiSan Francisco$2.9M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.