Gregory Grimberg, MD
Surgery · Mason City, IANPI 1104245307
Payments from drug & device makers
Across 46 payments — averaging $81.51 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Intuitive Surgical$3K
- Medtronic$199
- Phathom Pharmaceuticals, Inc.$172
- Davol Inc.$163
- Johnson & Johnson$133
- Bayer$125
- plus $392 from 12 others
What the payments were for
- Food & beverage$1,75047%
- Education$2,00053%
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 |
|---|---|---|
| Intuitive Surgical | 12 | $2,566 |
| Medtronic | 8 | $199 |
| Phathom Pharmaceuticals, Inc. | 6 | $172 |
| Davol Inc. | 1 | $163 |
| Johnson & Johnson | 3 | $133 |
| Bayer | 1 | $125 |
| Zimmer Biomet | 2 | $86 |
| Lexington Medical, Inc. | 1 | $55 |
| Convatec Inc. | 2 | $48 |
| Boston Scientific | 1 | $30 |
| Takeda Pharmaceuticals U.S.A., Inc. | 2 | $29 |
| Mauna Kea Technologies, Inc. | 1 | $27 |
| Stryker | 1 | $23 |
| Bioventus LLC | 1 | $22 |
| Novo Nordisk | 1 | $21 |
| Microline Surgical Inc | 1 | $21 |
| TELA Bio, Inc. | 1 | $16 |
| Integra Lifesciences Corporation | 1 | $15 |
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.
- Da Vinci Surgical System$2,142
- Bard 3DMax Mesh$163
- Kerendia$125
How this compares
$3,750 in reported general payments places this provider in the 75th percentile of 331 surgery providers in Iowa.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Sucralfate | 23 | $836 |
| Pantoprazole Sodium | 55 | $527 |
Paid to pharmacies, not to this prescriber.
Other surgery in Mason City
- Erik BrinkMason City$22K
- Patrick McGonagillIowa City$366K
- Teresa LamastersWest Des Moines$188K
- Vincent ReidCedar Rapids$159K
- Christopher HealeyWaterloo$140K
- Jerrod KeithIowa City$100K
- William AudehCedar Rapids$50K
- Dennis WhitmerDes Moines$40K
- Jason KeoninSpencer$39K
- Isaac HintonBettendorf$32K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.