Merrill Gershwin
Rheumatology · Davis, CANPI 1881677268
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $159,249 of the $168,596 with a category attached, or 94.5%. 8 manufacturers reported payments, led by Bayer at 46.3% of the total. Reporting peaked in 2020 at $57,938 and has fallen 74.1% since, to $15,021 in 2025. Among rheumatology clinicians in CA with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 50 payments — averaging $3371.92 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Bayer$78K
- GSK$63K
- Ironwood Pharmaceuticals, Inc$13K
- EMD Serono Research & Development Institute, Inc.$6K
- Genentech USA, Inc.$3K
- Ipsen Innovation$3K
- plus $2K from 2 others
Across 15 payments — averaging $21,342 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.
- GSK$279K
- Takeda Pharmaceuticals U.S.A., Inc.$25K
- Kedrion S.p.a.$16K
What the payments were for
- Consulting fees$159,24994%
- Speaking & faculty fees$2,6252%
- Travel & lodging$5,7193%
- Food & beverage$1,0041%
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 |
|---|---|---|
| Bayer | 11 | $78,125 |
| GSK | 27 | $62,950 |
| Ironwood Pharmaceuticals, Inc | 4 | $13,475 |
| EMD Serono Research & Development Institute, Inc. | 2 | $5,850 |
| Genentech USA, Inc. | 3 | $3,248 |
| Ipsen Innovation | 1 | $3,150 |
| Ipsen Biopharmaceuticals, Inc | 1 | $1,361 |
| Eli Lilly | 1 | $438 |
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.
- Essure$78,125
How this compares
$168,596 in reported general payments places this provider in the 90th percentile of 808 rheumatology providers in California.
Other rheumatology in Davis
- Sudhakar TumuluriSan Francisco$2.8M
- Ara DikranianSan Diego$2.2M
- Orrin TroumSanta Monica$1.8M
- Robin DoreTustin$1.5M
- Samy MetyasCovina$1.3M
- Rhonda LambertSan Mateo$1.1M
- William ShielMission Viejo$924K
- Mark BoriginiDowney$920K
- Adam KreitenbergTarzana$863K
- Roger KornuTustin$802K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.