Kenneth Hammerman
Gastroenterology · San Francisco, CANPI 1174600365
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 100.0% of the total across 107 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 17 manufacturers reported payments, led by Johnson & Johnson at 33.6% of the total. Reporting peaked in 2019 at $1,161 and has fallen 88.6% since, to $133 in 2023. That places this record below the midpoint for gastroenterology clinicians in CA, where the typical reported total is $1,790.
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
- Kenneth BinmoellerSan Francisco$507K
- Uma MahadevanSan Francisco$325K
- Francis YaoSan Francisco$159K
- Bennett RothLos Angeles$2.8M
- Douglas NguyenMission Viejo$2M
- Sammy SaabLos Angeles$1.9M
- Kenneth ChangNewport Beach$1.3M
- Joo HwangStanford$1M
- Drew SchembreWalnut Creek$659K
- Quan Nhula Jolla$641K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.