Nicholas Walker, MD
Interventional Cardiology · Coralville, IANPI 1437241221
Payments from drug & device makers
What this record shows
This record is dominated by travel and lodging: $1,549 of the $2,270 with a category attached, or 68.2%. Medtronic accounts for 79.5% of it on its own, with 4 other manufacturers making up the rest. 2025 is the largest year on record at $1,887, more than ten times the $119 reported in 2019. That places this record below the midpoint for interventional cardiology clinicians in IA, where the typical reported total is $3,872.
Across 29 payments — averaging $78.28 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$2K
- Abiomed$201
- Boston Scientific$199
- Shockwave Medical, Inc$42
- AbbVie$24
What the payments were for
- Travel & lodging$1,54968%
- Food & beverage$72132%
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 | 14 | $1,804 |
| Abiomed | 7 | $201 |
| Boston Scientific | 5 | $199 |
| Shockwave Medical, Inc | 2 | $42 |
| AbbVie | 1 | $24 |
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.
- SYMPLICITY G3$1,242
- ONYX FRONTIER$309
- Watchman$120
How this compares
$2,270 in reported general payments places this provider in the 30th percentile of 64 interventional cardiology 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 |
|---|---|---|
| EliquisApixaban | 161 | $151,206 |
| XareltoRivaroxaban | 72 | $94,394 |
| EntrestoSacubitril/Valsartan | 70 | $62,596 |
| Repatha SureclickEvolocumab | 56 | $36,559 |
| JardianceEmpagliflozin | 32 | $35,921 |
| FarxigaDapagliflozin Propanediol | 18 | $11,284 |
| Metoprolol Succinate | 499 | $6,220 |
| Ranolazine ErRanolazine | 26 | $3,377 |
| Atorvastatin Calcium | 360 | $3,056 |
| Isosorbide Mononitrate ErIsosorbide Mononitrate | 186 | $2,179 |
| Rosuvastatin Calcium | 239 | $2,050 |
| Amlodipine Besylate | 260 | $1,596 |
| Losartan Potassium | 252 | $1,544 |
| Flecainide Acetate | 16 | $1,470 |
| Lisinopril | 274 | $1,405 |
Paid to pharmacies, not to this prescriber.
Other interventional cardiology in Coralville
- Nicolas ShammasDavenport$808K
- Eric DippelDavenport$100K
- Atul ChawlaDes Moines$78K
- Magdi GhaliWest Des Moines$64K
- David McAllisterDes Moines$55K
- Daniel ShivapourDes Moines$54K
- Srikanth KasulaDavenport$43K
- Abdulrahman AbdulbakiDes Moines$43K
- Jason AllenIowa City$30K
- Hossein OuranosIowa City$28K
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.