RxDoctor Payments DataLook up a doctor →

Christopher Chapman, MD

Gastroenterology · Chicago, ILNPI 1235378043

Payments from drug & device makers

$644,849in general payments, 2019–2025

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
$8,650in research payments, 2019–2025

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

19
20
21
22
23
24
25

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.

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

$644,849 in reported general payments places this provider in the 95th percentile of 787 gastroenterology providers in Illinois.

See all gastroenterology providers in Illinois

Medicare billing

Part B allowed, 2024
$82,317
Medicare patients
172
Services billed
486

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

DrugClaimsCost to plans & patients
Sod Sulf-Potass Sulf-Mag SulfSodium, Potassium,mag Sulfates17$1,067
Gavilyte-GPeg3350/Sod Sulf,bicarb,cl/Kcl32$486
Omeprazole22$196
Peg-3350 And ElectrolytesPeg3350/Sod Sulf,bicarb,cl/Kcl11$173

Paid to pharmacies, not to this prescriber.

Other gastroenterology in Chicago

See the full list for Illinois

Where these figures come from

Is this you, or does something look wrong? →