Who Paid My Doc
William Chapman
Colon & Rectal Surgery Saint Louis, MO Medical Doctor
NPI 1003297177 CMS profile 1351459
1044 N Mason Rd, Div Surg Colon/Rectal, Ste 310, Saint Louis, MO 63141
General payments
$2,838
Research payments
$0
Ownership & investment interest
$0
Research they led as principal investigator
$208,530
Through program year 2025, William Chapman of Saint Louis, MO is reported in the CMS Open Payments database as having received $2,838 across 15 general payments and $0 in research payments paid to them. Separately, studies naming them as principal investigator received $208,530 in research payments, paid to institutions rather than to them.
No combined total General, research and ownership are kept apart. Each is reported under its own rules, and ownership is not money that moved at all but the value of a stake held. A meal, a clinical trial grant and a shareholding do not add up to anything meaningful, so this site does not add them. The principal-investigator line is research money paid to institutions for studies they led — not to them — and is not added to anything either.
General payments for this record sit in the 49th percentile of Colon & Rectal Surgery profiles with reported payments. Percentile describes the distribution, not the conduct.
By program year
6 rows| Year | Kind | Relative to this record's peak year | Amount | Records |
|---|---|---|---|---|
| 2025 | General | $178 | 1 | |
| 2024 | General | $1,094 | 2 | |
| 2023 | General | $81 | 2 | |
| 2022 | General | $1,002 | 5 | |
| 2020 | General | $348 | 3 | |
| 2019 | General | $134 | 2 |
Beside peers
- William Chapman
- Colon & Rectal Surgery median
- Middle half of Colon & Rectal Surgery
- National median
In program year 2025, general payments to William Chapman were reported at $178. Among 1,481 Colon & Rectal Surgery profiles paid that year, the median was $317 and the middle half received between $109 and $1,248.
Show as a table
| Year | William Chapman | Colon & Rectal Surgery median | Middle half | National median |
|---|---|---|---|---|
| 2019 | $134 | $443 | $125–$2,179 | $163 |
| 2020 | $348 | $167 | $53–$931 | $114 |
| 2021 | $0 | $207 | $72–$1,272 | $132 |
| 2022 | $1,002 | $341 | $111–$1,587 | $149 |
| 2023 | $81 | $322 | $115–$1,420 | $160 |
| 2024 | $1,094 | $328 | $112–$1,354 | $164 |
| 2025 | $178 | $317 | $109–$1,248 | $169 |
Breakdown
A payment can name more than one product, so these amounts overlap and do not add up to the general-payment figure.
Prescribing to Medicare patients
Part D · data year 2024 · 5 drugsPart D claims
201
Drug cost
$2,459
Branded share of claims
34.3%
| Drug | Type | Relative to their largest | Claims | Drug cost |
|---|---|---|---|---|
| Sod Sulf-Potass Sulf-Mag Sulf Sodium, Potassium,mag Sulfates | Brand | 30 | $1,954 | |
| Neomycin Sulfate | Generic | 58 | $307 | |
| Metronidazole | Generic | 59 | $81 | |
| Oxycodone Hcl | Generic | 15 | $62 | |
| Ondansetron Odt Ondansetron | Brand | 39 | $55 |
Drug cost is what was paid for the drugs at the pharmacy — by Medicare, the patient and others — and is not money to the prescriber. Medicare Part D only: drugs dispensed to Medicare beneficiaries. A drug with fewer than 11 claims for this prescriber is not published, so a missing drug does not mean zero. The medians are for the 1,507 Part D prescribers listed as Colorectal Surgery (Proctology); they describe a distribution and say nothing about conduct.
Billing to Medicare
Part B · data year 2024 · 69 billing codesPaid by Medicare
$65,051
Medicare patients
124
Services billed
244
| Condition among their Medicare patients | Relative to the most common | Share of patients |
|---|---|---|
| High blood pressure | 75% | |
| Arthritis | 44% | |
| Cancer | 42% | |
| Depression | 35% | |
| Diabetes | 31% | |
| Ischemic heart disease | 31% | |
| Chronic kidney disease | 30% | |
| Atrial fibrillation | 24% |
Medicare Part B only: services billed to Medicare. Rows covering fewer than 11 beneficiaries are not published. Only drugs given in the clinic are itemised here; the rest of what this provider billed is in the total above.
Records
15 reportedEvery payment, record by record
Date, company, amount, what it was for and the product named — filter by year, kind and company, or download as CSV.
Other Colon & Rectal Surgery in Missouri
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Paul Wise
Colon & Rectal Surgery · Saint Louis, MO
Donald Summers
Colon & Rectal Surgery · Saint Louis, MO
Steven Hunt
Colon & Rectal Surgery · Saint Louis, MO
Tatiana Ramirez Dominguez
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Related records
Colon & Rectal Surgery in Missouri
Practitioners in the same specialty and state, ranked by reported value.
All Colon & Rectal Surgery
Everyone recorded under this specialty, nationwide.
Doctors in Missouri
Every practitioner in the state with a reported payment.
How to read this page
What each amount means, and what it does not mean.
What this means
U.S. law requires drug and medical device manufacturers to report payments and transfers of value they make to physicians and teaching hospitals. The Centers for Medicare & Medicaid Services publishes that record each year. This page shows what was reported about this person, and nothing else.
An ownership interest is different from the other two. It is not a payment: it is a stake — shares, options, a partnership holding — that a physician or an immediate family member held in a manufacturer during that year. The figure shown is what the stake was reported to be worth.
Research payments frequently pass through a clinician to the institution running a trial, and rarely represent personal income. They should be read differently from general payments.