Christopher Chapman, MD
Gastroenterology · Chicago, ILNPI 1235378043
Payments from drug & device makers
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
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 |
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.
Other gastroenterology in Chicago
- David RubinChicago$3.6M
- Stephen HanauerChicago$2.9M
- Parambir DulaiChicago$2.2M
- Ikuo HiranoChicago$1.8M
- Steven FlammChicago$1.6M
- Darren BrennerChicago$1.1M
- Russell CohenChicago$985K
- Mary RinellaChicago$938K
- Emanuelle BellaguardaChicago$868K
- Saurabh KapurChicago$867K
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.