Michael Warren, DO
Gastroenterology · Tulsa, OKNPI 1568963551
Payments from drug & device makers
What this record shows
Almost everything reported here is food and beverage — 95.3% of the total across 230 separate payments, which is the pattern of a clinician who attends manufacturer presentations rather than one with a consulting arrangement. 30 manufacturers reported payments, led by AbbVie at 47.9% of the total.
Across 230 payments — averaging $30.61 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- AbbVie$3K
- Boston Scientific$596
- Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$483
- Pfizer$390
- Johnson & Johnson$330
- Gilead$218
- plus $2K from 24 others
What the payments were for
- Travel & lodging$3335%
- Food & beverage$6,70795%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
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 |
|---|---|---|
| AbbVie | 111 | $3,369 |
| Boston Scientific | 5 | $596 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 21 | $483 |
| Pfizer | 19 | $390 |
| Johnson & Johnson | 17 | $330 |
| Gilead | 4 | $218 |
| QOL Medical, LLC | 3 | $180 |
| Takeda Pharmaceuticals U.S.A., Inc. | 8 | $159 |
| Apollo Endosurgery US Inc | 1 | $156 |
| Ferring Pharmaceuticals Inc. | 2 | $154 |
| Sanofi | 7 | $142 |
| Madrigal Pharmaceuticals | 4 | $134 |
| Medtronic | 1 | $126 |
| Janssen Scientific Affairs, LLC | 1 | $108 |
| Regeneron Healthcare Solutions, Inc. | 4 | $81 |
| Intercept Pharmaceuticals, Inc. | 5 | $78 |
| Mallinckrodt Hospital Products Inc. | 2 | $59 |
| Ipsen Biopharmaceuticals, Inc | 2 | $38 |
| Phathom Pharmaceuticals, Inc. | 2 | $31 |
| Biocon Biologics Inc | 1 | $29 |
| Boehringer Ingelheim | 1 | $28 |
| Aimmune Therapeutics, Inc. | 1 | $26 |
| La Jolla Pharmaceutical Company | 1 | $23 |
| Lilly USA, LLC | 1 | $22 |
| Merck | 1 | $19 |
| Ardelyx, Inc. | 1 | $15 |
| Ironwood Pharmaceuticals, Inc | 1 | $13 |
| Daiichi Sankyo Inc. | 1 | $13 |
| Almatica Pharma LLC | 1 | $11 |
| Micro-tech Endoscopy USA, Inc. | 1 | $10 |
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.
How this compares
$7,040 in reported general payments places this provider in the 60th percentile of 133 gastroenterology providers in Oklahoma.
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 |
|---|---|---|
| Gavilyte-GPeg3350/Sod Sulf,bicarb,cl/Kcl | 102 | $1,499 |
| Peg-3350 And ElectrolytesPeg3350/Sod Sulf,bicarb,cl/Kcl | 46 | $659 |
| Omeprazole | 13 | $555 |
| Pantoprazole Sodium | 15 | $243 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in Tulsa
- Jeffrey HuntTulsa$155K
- Harvey TatumTulsa$27K
- Roy ThompsonTulsa$16K
- Aaron FiekerTulsa$15K
- Vasudevan RaghuramanTulsa$14K
- William BriggsTulsa$14K
- Sheldon BergerTulsa$14K
- David MorrisTulsa$13K
- Patrick VolakTulsa$13K
- Matt BlankenshipTulsa$12K
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.