John Grehan, MD
Thoracic Surgery (Cardiothoracic Vascular Surgery) · Sioux Falls, SDNPI 1275549784
Payments from drug & device makers
What this record shows
This record is dominated by royalties or licence payments: $116,163 of the $187,123 with a category attached, or 62.1%. Zimmer Biomet accounts for 65.3% of it on its own, with 21 other manufacturers making up the rest.
Across 178 payments — averaging $1051.25 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Zimmer Biomet$122K
- Atricure, Inc.$35K
- JACE Medical LLC$21K
- Abbott$7K
- Edwards Lifesciences$997
- Abiomed$338
- plus $723 from 16 others
Across 12 payments — averaging $726.60 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.
- Atricure, Inc.$9K
What the payments were for
- Royalty or licence$116,16362%
- Consulting fees$57,35731%
- Speaking & faculty fees$9000%
- Travel & lodging$7,4494%
- Food & beverage$5,2543%
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 | 30 | $122,233 |
| Atricure, Inc. | 82 | $34,635 |
| JACE Medical LLC | 3 | $21,388 |
| Abbott | 22 | $6,810 |
| Edwards Lifesciences | 5 | $997 |
| Abiomed | 9 | $338 |
| Getinge USA Sales, LLC | 8 | $194 |
| Artivion, Inc. | 2 | $130 |
| Wound Management Technologies, Inc | 2 | $52 |
| W. L. Gore & Associates, Inc. | 1 | $44 |
| Pfizer | 2 | $36 |
| BD | 1 | $34 |
| Smith+Nephew | 1 | $34 |
| Amgen | 2 | $33 |
| Davol Inc. | 1 | $26 |
| LSI Solutions Inc | 1 | $26 |
| Convatec Inc. | 1 | $24 |
| Intuitive Surgical | 1 | $22 |
| Daiichi Sankyo Inc. | 1 | $20 |
| Medtronic | 1 | $18 |
| Johnson & Johnson | 1 | $15 |
| AstraZeneca | 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.
- STERNALOCK$43,057
- STERNALOCK 360 SYSTEM$40,658
- Cable Ready$32,449
- ATRICURE SYNERGY ABLATION SYSTEM$15,433
- ATRICURE ATRICLIP LAA EXCLUSION$10,244
- Low Profile$9,727
- ATRICLIP LAA EXCLUSION SYSTEM$4,090
- SYNERGY ABLATION SYSTEM$3,797
- Surgical Instruments$3,709
- ATRICURE CRYOICE CRYOSPHERE CRYOABLATION SYSTEM$3,368
- Epic Stented Tissue Valve$2,760
- Trifecta GT Tissue Heart Valve$2,165
- ISOLATOR SURGICAL ABLATION SYSTEM$1,368
- DISSECTOR$1,368
- ATRICURE CRYOSURGICAL SYSTEM$1,200
- MitraClip System$1,200
- INSPIRIS RESILIA aortic valve$900
- STERNALOCK BLU SYSTEM$280
- ATRICURE CRYOICE CRYOABLATION SYSTEM (CRYO2)$167
- PORTICO$114
How this compares
Too few thoracic surgery (cardiothoracic vascular surgery) providers in South Dakotato place this figure against a meaningful peer group, so we don't.
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 thoracic surgery (cardiothoracic vascular surgery) in Sioux Falls
- Keung UngSioux Falls$7K
- David MaziarzSioux Falls$3K
- Paul MeyerSioux Falls$3K
- Tommy ReynoldsSioux Falls$2K
- Verlyn NykampSioux Falls$760
- Brian DuxburySioux Falls$228
- Steven FeldhausSioux Falls$169
- Luyando KalemboSioux Falls$30
- Tommaso CambiaghiRapid City$34K
- Charan MungaraRapid City$10K
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.