Nicholas Gourtzelis, MD
Nephrology · St Louis, MONPI 1790734994
Payments from drug & device makers
Across 461 payments — averaging $19.27 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Otsuka America Pharmaceutical, Inc.$1K
- Amgen$852
- Akebia Therapeutics Inc$800
- Vifor Pharma, Inc.$798
- AstraZeneca$743
- OPKO Pharmaceuticals, LLC$576
- plus $4K from 27 others
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 |
|---|---|---|
| Otsuka America Pharmaceutical, Inc. | 75 | $1,326 |
| Amgen(2 entities) | 48 | $852 |
| Akebia Therapeutics Inc | 37 | $800 |
| Vifor Pharma, Inc. | 48 | $798 |
| AstraZeneca | 40 | $743 |
| OPKO Pharmaceuticals, LLC | 39 | $576 |
| Travere Therapeutics, Inc. | 21 | $533 |
| Bayer | 24 | $443 |
| Mallinckrodt Hospital Products Inc. | 13 | $355 |
| GSK | 19 | $310 |
| Fresenius USA Marketing, Inc. | 14 | $268 |
| Boehringer Ingelheim | 10 | $222 |
| Calliditas Therapeutics US Inc. | 7 | $190 |
| Novartis | 8 | $182 |
| Mallinckrodt Enterprises LLC | 7 | $135 |
| Aurinia Pharma U.S., Inc. | 5 | $124 |
| Pharmacosmos Therapeutics Inc. | 6 | $119 |
| Novo Nordisk | 5 | $103 |
| Vantive US Healthcare LLC | 2 | $101 |
| Otsuka Pharmaceutical Development & Commercialization, Inc. | 4 | $98 |
| Daiichi Sankyo Inc. | 5 | $97 |
| Ardelyx, Inc. | 3 | $85 |
| Takeda Pharmaceuticals U.S.A., Inc. | 4 | $77 |
| E.r. Squibb & Sons, L.L.C. | 5 | $76 |
| ANI Pharmaceuticals, Inc. | 3 | $75 |
| Cormedix Inc. | 1 | $33 |
| Shire North American Group Inc | 2 | $31 |
| Baxter Healthcare | 1 | $27 |
| Recor Medical Inc | 1 | $25 |
| Ascendis Pharma Endocrinology Inc | 1 | $24 |
| Lemaitre Vascular, Inc. | 1 | $21 |
| Scpharmaceuticals Inc. | 1 | $20 |
| Shield Therapeutics Inc | 1 | $14 |
How this compares
$8,884 in reported general payments places this provider in the 80th percentile of 253 nephrology providers in Missouri.
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 nephrology in St Louis
- Kevin MartinSt Louis$189K
- Bahar BastaniSt Louis$87K
- Sana ShaikhSt Louis$49K
- Aliza Anwar MemonSt Louis$37K
- Ahmed AwadKansas City$12.4M
- Benjamin HumphreysSaint Louis$1.2M
- Donovan PolackFlorissant$782K
- Derek LarsonCreve Coeur$605K
- Gary SingerSaint Peters$580K
- Daniel CoyneSaint Louis$563K
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.