Christopher Chapman, MD
Gastroenterology · Chicago, ILNPI 1235378043
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $394,544 of the $644,849 with a category attached, or 61.2%. 19 manufacturers reported payments, led by Boston Scientific at 40.7% of the total. 2025 is the largest year on record at $217,497, 6.2 times the $35,165 reported in 2019. Among gastroenterology clinicians in IL with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 686 payments — averaging $940.01 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Boston Scientific$263K
- AbbVie$138K
- Apollo Endosurgery US Inc$110K
- Phathom Pharmaceuticals, Inc.$57K
- Intuitive Surgical$33K
- Olympus America Inc.$11K
- plus $32K from 13 others
Across 3 payments — averaging $2883.33 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.
- Erbe Elektromedizin GmbH$9K
What the payments were for
- Consulting fees$168,68226%
- Speaking & faculty fees$394,54461%
- Travel & lodging$55,6549%
- Food & beverage$21,5993%
- Education$4,2501%
- Entertainment$1200%
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 |
|---|---|---|
| Boston Scientific | 280 | $262,766 |
| AbbVie | 95 | $138,358 |
| Apollo Endosurgery US Inc | 108 | $110,416 |
| Phathom Pharmaceuticals, Inc. | 69 | $57,390 |
| Intuitive Surgical | 24 | $32,853 |
| Olympus America Inc. | 20 | $11,041 |
| Olympus Medical Systems Corporation | 11 | $8,775 |
| Olympus Corporation | 9 | $5,612 |
| Olympus Corporation Of The Americas | 15 | $5,386 |
| US Endoscopy | 1 | $4,000 |
| Medtronic | 6 | $3,250 |
| Cook Medical LLC | 23 | $1,969 |
| Steris Corporation | 8 | $1,356 |
| Ambu Inc. | 4 | $603 |
| Conmed Corporation | 7 | $481 |
| ERBE USA Inc | 2 | $234 |
| Novo Nordisk | 2 | $210 |
| Aspire Bariatrics, Inc. | 1 | $113 |
| Lilly USA, LLC | 1 | $36 |
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.
- Creon$112,865
- ORBERA Intragastric Balloon System$70,385
- GENERAL - THERAPIES$64,719
- OverStitch Endoscopic Suturing System$62,205
- VOQUEZNA$56,767
- OverStitch Endoscopic Suturing System Sx$39,144
- Overstitch$34,132
- Da Vinci Surgical System$32,506
- X-Tack Endoscopic HeliX Tacking System$30,864
- EXALT Model D$24,152
- OverStitch NXT Endoscopic Suturing System$14,419
- Resolution 360 Clip$10,415
- Olympus Biliary Devices$7,139
- Single Use Repositionable Clip$4,144
- Metal Stents$3,225
- RESOLUTION CLIP$2,625
- WALLFLEX$2,250
- X-tack$2,000
- Apollo ESG NXT System$1,595
- SPYGLASS$1,277
How this compares
$644,849 in reported general payments places this provider in the 95th percentile of 787 gastroenterology 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 |
|---|---|---|
| Sod Sulf-Potass Sulf-Mag SulfSodium, Potassium,mag Sulfates | 17 | $1,067 |
| Gavilyte-GPeg3350/Sod Sulf,bicarb,cl/Kcl | 32 | $486 |
| Omeprazole | 22 | $196 |
| Peg-3350 And ElectrolytesPeg3350/Sod Sulf,bicarb,cl/Kcl | 11 | $173 |
Paid to pharmacies, not to this prescriber.
Other gastroenterology in Chicago
- David RubinChicago$1.5M
- Stephen HanauerChicago$1.4M
- Steven FlammChicago$1.3M
- Darren BrennerChicago$1.1M
- Russell CohenChicago$690K
- Parambir DulaiChicago$668K
- Saurabh KapurChicago$532K
- Ikuo HiranoChicago$457K
- Adam SteinChicago$438K
- John PandolfinoChicago$328K
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.