Gregory Hammer
Anesthesiology · Stanford, CANPI 1396885455
Payments from drug & device makers
What this record shows
The money is spread across several categories — speaking fees (50.3%), consulting fees and travel and lodging — rather than concentrated in one kind of arrangement. 5 manufacturers reported payments, led by Trevena, Inc. at 34.8% of the total. Reporting peaked in 2021 at $7,900 and has fallen 85.8% since, to $1,125 in 2023. Among anesthesiology clinicians in CA with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 17 payments — averaging $848.68 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Trevena, Inc.$5K
- Edwards Lifesciences$5K
- Merck$3K
- Baxter Healthcare$850
- Acacia Pharma Inc$126
Across 271 payments — averaging $6799.63 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- Merck$848K
- Acacia Pharma Inc$355K
- Pfizer$269K
- Hikma Pharmaceuticals USA$154K
- Pacira Pharmaceuticals Incorporated$138K
- Masimo Corporation$75K
- plus $4K from 1 others
What the payments were for
- Consulting fees$5,60039%
- Speaking & faculty fees$7,25050%
- Travel & lodging$1,1408%
- Food & beverage$4373%
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 |
|---|---|---|
| Trevena, Inc. | 2 | $5,024 |
| Edwards Lifesciences | 4 | $5,000 |
| Merck | 8 | $3,427 |
| Baxter Healthcare | 2 | $850 |
| Acacia Pharma Inc | 1 | $126 |
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.
- HemoSphere$4,500
- BRIDION$1,288
- Fluid Systems - Infusion Systems$500
- Edwards SAPIEN 3 Transcatheter Heart Valve$500
- IPS - Liquid Premix$350
- BYFAVO$126
- BARHEMSYS$126
How this compares
$14,428 in reported general payments places this provider in the 95th percentile of 5,717 anesthesiology providers in California.
Other anesthesiology in Stanford
- Lawrence ChuStanford$205K
- Hendrikus LemmensStanford$200K
- Brendan CarvalhoStanford$170K
- Martin AngstStanford$99K
- William FeasterStanford$68K
- Ryan DerbyStanford$61K
- Barrett LarsonStanford$51K
- Jack JengSouth San Francisco$1.3M
- Roger PhillipsChico$434K
- David DeyhimyLaguna Hills$344K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.