John Hammock, MD
Clinical Cardiac Electrophysiology · Quincy, ILNPI 1912082975
Payments from drug & device makers
What this record shows
16 manufacturers reported payments, led by Medtronic at 34.4% of the total. Reporting peaked in 2019 at $4,924 and has fallen 75.1% since, to $1,225 in 2025. That places this record below the midpoint for clinical cardiac electrophysiology clinicians in IL, where the typical reported total is $24,482.
Across 285 payments — averaging $41.08 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$4K
- Medical Device Business Services, Inc.$4K
- Biosense Webster, Inc.$2K
- Abbott$659
- Boston Scientific$316
- Novartis$90
- plus $388 from 10 others
Across 17 payments — averaging $5908.24 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.
- Janssen Research & Development, LLC$100K
What the payments were for
- Travel & lodging$6,77958%
- Food & beverage$4,92842%
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(2 entities) | 63 | $4,021 |
| Medical Device Business Services, Inc. | 24 | $3,913 |
| Biosense Webster, Inc. | 128 | $2,319 |
| Abbott | 28 | $659 |
| Boston Scientific | 13 | $316 |
| Novartis | 5 | $90 |
| ZOLL Services LLC (a/k/a ZOLL Lifecor Corp) | 10 | $86 |
| Philips North America LLC | 2 | $65 |
| Amgen | 4 | $61 |
| Abiomed | 1 | $51 |
| E.r. Squibb & Sons, L.L.C. | 2 | $38 |
| Heartflow, Inc. | 1 | $25 |
| Inspire Medical Systems, Inc. | 1 | $18 |
| Pfizer | 1 | $15 |
| Shockwave Medical, Inc | 1 | $15 |
| Sanofi-aventis U.S. LLC | 1 | $14 |
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.
- Carto 3 System$2,297
- Carto 3$2,034
- SelectSecure$173
- Claria MRI$162
- COBALT DR MRI SURESCAN$155
- WATCHMAN Access System$145
- OCTARAY MAPPING CATHETER$124
- EVERA MRI XT DR SURESCAN$123
- AMPLATZER Occluders$107
How this compares
$11,707 in reported general payments places this provider in the 30th percentile of 158 clinical cardiac electrophysiology providers in Illinois.
See all clinical cardiac electrophysiology providers in Illinois →
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 | 386 | $293,313 |
| XareltoRivaroxaban | 116 | $85,808 |
| Dofetilide | 85 | $9,973 |
| JardianceEmpagliflozin | 13 | $6,839 |
| Flecainide Acetate | 164 | $3,543 |
| Metoprolol Succinate | 323 | $3,075 |
| SotalolSotalol Hcl | 171 | $2,338 |
| Mexiletine Hcl | 32 | $1,622 |
| Diltiazem 24hr Er (Cd)Diltiazem Hcl | 126 | $1,295 |
| Amiodarone Hcl | 109 | $1,181 |
| Potassium Chloride | 68 | $996 |
| Nebivolol Hcl | 24 | $917 |
| Atorvastatin Calcium | 68 | $639 |
| Pantoprazole Sodium | 76 | $511 |
| Hydralazine Hcl | 38 | $506 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| PfizerEliquis | $15 | $293,313386 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 30th percentile of 158 clinical cardiac electrophysiology providers in Illinois.
Other clinical cardiac electrophysiology in Quincy
- Mansour RazminiaPalos Heights$927K
- Mark MetzlEvanston$799K
- Roderick TungChicago$795K
- Bradley KnightChicago$661K
- Gaurav UpadhyayChicago$593K
- Henry HuangGeneva$501K
- Kousik KrishnanNaperville$311K
- Hany DemoChicago$297K
- Cash CaseyElmhurst$287K
- Moeen SaleemNaperville$249K
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.