Kenneth Hammerman
Gastroenterology · San Francisco, CANPI 1174600365
Payments from drug & device makers
Across 107 payments — averaging $20.60 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Johnson & Johnson$741
- AbbVie$490
- Pfizer$240
- Gilead$161
- Takeda Pharmaceuticals U.S.A., Inc.$129
- E.r. Squibb & Sons, L.L.C.$92
- plus $352 from 11 others
What the payments were for
- Food & beverage$2,205100%
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 |
|---|---|---|
| Johnson & Johnson | 33 | $741 |
| AbbVie | 24 | $490 |
| Pfizer | 12 | $240 |
| Gilead | 7 | $161 |
| Takeda Pharmaceuticals U.S.A., Inc. | 7 | $129 |
| E.r. Squibb & Sons, L.L.C. | 3 | $92 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 5 | $82 |
| Ferring Pharmaceuticals Inc. | 5 | $82 |
| QOL Medical, LLC | 2 | $43 |
| Intercept Pharmaceuticals, Inc. | 2 | $38 |
| Arbor Pharmaceuticals, Inc. | 1 | $18 |
| Lilly USA, LLC | 1 | $16 |
| Amarin Pharma, Inc. | 1 | $15 |
| Braintree Laboratories, Inc. | 1 | $15 |
| Bristol Myers Squibb | 1 | $15 |
| Napo Pharmaceuticals Inc | 1 | $14 |
| Concordia Pharmaceuticals Inc. | 1 | $14 |
How this compares
$2,205 in reported general payments places this provider in the 50th percentile of 1,885 gastroenterology providers in California.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Losartan Potassium | 15 | $214 |
| Atorvastatin Calcium | 18 | $165 |
| Amlodipine Besylate | 14 | $96 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in San Francisco
- Vivek RudrapatnaSan Francisco$2M
- Bruce WangSan Francisco$1.1M
- Mandana KhaliliSan Francisco$906K
- Kendall BeckSan Francisco$743K
- Uma MahadevanSan Francisco$690K
- Peter WinkleCypress$116.7M
- Manuchehr DaraniSanta Ana$17.7M
- Jatinder PruthiLancaster$4.4M
- Long DangWestminster$4.3M
- Muhammad SheikhFresno$4.3M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.