Timothy Ryken, MD
Neurological Surgery · Des Moines, IANPI 1235122359
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $35,195 of the $43,777 with a category attached, or 80.4%. Medtronic accounts for 85.1% of it on its own, with 8 other manufacturers making up the rest. Among neurological surgery clinicians in IA 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 72 payments — averaging $608.01 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$37K
- Depuy Synthes Products, Inc.$4K
- Mighty Oak Medical$1K
- Arbor Pharmaceuticals, Inc.$998
- GT Medical Technologies, Inc$108
- Johnson & Johnson$89
- plus $114 from 3 others
Across 11 payments — averaging $2313.18 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.
- Arbor Pharmaceuticals, Inc.$14K
- Medtronic$7K
- Azurity Pharmaceuticals, Inc.$5K
What the payments were for
- Consulting fees$35,19580%
- Speaking & faculty fees$2,2505%
- Travel & lodging$3,6328%
- Food & beverage$1,7024%
- Education$9982%
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 |
|---|---|---|
| Medtronic | 59 | $37,273 |
| Depuy Synthes Products, Inc. | 1 | $4,095 |
| Mighty Oak Medical | 1 | $1,100 |
| Arbor Pharmaceuticals, Inc. | 2 | $998 |
| GT Medical Technologies, Inc | 2 | $108 |
| Johnson & Johnson | 2 | $89 |
| Spineology Inc. | 2 | $59 |
| Synthes USA Products LLC | 2 | $34 |
| Nevro Corp. | 1 | $22 |
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.
- MIDAS REX$32,412
- EXPEDIUM$4,095
- VIPER$4,095
- MOUNTAINEER$4,095
- BRAINLAB$4,095
- ENDOSKELETON TC NANOLOCK SURFACE TECHNOLOGY$2,250
- Gliadel$998
- MAZOR X SYSTEM$490
- UNID_PASS$164
- ADAPTIX INTERBODY SYSTEM WITH TITAN NANOLOCK SURFACE TECHNOLOGY$125
How this compares
$43,777 in reported general payments places this provider in the 95th percentile of 54 neurological 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.
Other neurological surgery in Des Moines
- Nicholas WetjenDes Moines$23K
- Troy MunsonDes Moines$15K
- Zoya VoronovichDes Moines$11K
- Royce WoodroffeDes Moines$8K
- Einar BogasonDes Moines$4K
- Scott SeamanDes Moines$3K
- Esmiralda Yeremeyeva HendersonDes Moines$2K
- Joseph SherrillDes Moines$2K
- David BoariniDes Moines$638
- John PiperDes Moines$508
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.