Darin Larson, MD
Orthopaedic Surgery · Marshalltown, IANPI 1568842391
Payments from drug & device makers
Across 24 payments — averaging $119.01 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Zimmer Biomet$2K
- Medical Device Business Services, Inc.$679
- Stryker$124
- RSW Medical Company, Inc.$116
- Si-bone, Inc.$54
- Johnson & Johnson$24
- plus $21 from 1 others
What the payments were for
- Food & beverage$1,15540%
- Education$1,70260%
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 |
|---|---|---|
| Zimmer Biomet | 12 | $1,838 |
| Medical Device Business Services, Inc. | 4 | $679 |
| Stryker | 3 | $124 |
| RSW Medical Company, Inc. | 1 | $116 |
| Si-bone, Inc. | 2 | $54 |
| Johnson & Johnson | 1 | $24 |
| Smith+Nephew | 1 | $21 |
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.
- Persona$977
- Comprehensive Shoulder System$222
- Biomet Total Femur$215
- Knees Product Portfolio$150
- ROSA$120
How this compares
$2,856 in reported general payments places this provider in the 55th percentile of 219 orthopaedic 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 |
|---|---|---|
| Ondansetron OdtOndansetron | 36 | $433 |
| Oxycodone Hcl | 42 | $269 |
| Meloxicam | 15 | $34 |
| Cephalexin | 15 | $15 |
| Amoxicillin | 14 | $8 |
Paid to pharmacies, not to this prescriber.
Other orthopaedic surgery in Marshalltown
- John CallaghanIowa City$23.3M
- Cesar de Cesar NettoIowa City$905K
- Brian AdamsIowa City$868K
- Lynn NelsonBelmond$285K
- Robert WestermannIowa City$216K
- Jacob ElkinsIowa City$188K
- Brendan PattersonIowa City$166K
- Joseph BuckwalterIowa City$132K
- John FeminoIowa City$106K
- Clifford BoeseCouncil Bluffs$63K
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.