William C. Chapman Jr., MD
NPI 1003297177ActiveIndividual· Colon & Rectal Surgery· Saint Louis, MO
Colon & Rectal Surgery (MD) in Saint Louis, Missouri, trained at Georgetown University School of Medicine (class of 2015). 124 Medicare patients in 2024, $65,051 paid; nearly all of their 251 Part D prescriptions were generic (92%). Davol Inc. reported $178.42 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1003297177 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 15, 2015 |
| Last updated in NPPES | Apr 15, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Colon & Rectal Surgery Primary | 208C00000X | 2017007784 | MO |
| Surgery | 208600000X | 2017007784 | MO |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Colorectal Surgery (Proctology) (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 124 |
|---|---|
| Services billed | 244 across 69 procedure codes |
| Paid by Medicare | $65,051 |
Part D prescriptions in 2024
| Prescriptions (claims) | 251 · 253 30-day fills |
|---|---|
| Patients | 103 |
| Total drug cost | $5,164 |
| Generic share | 92% of claims |
Education and affiliations
| Medical school | Georgetown University School of Medicine |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | Colorectal Surgery (Proctology) |
| Telehealth | Offers telehealth |
Medical group
- Washington UniversitySaint Louis, MO · 3,029 clinicians
Hospital affiliations
- Barnes Jewish HospitalSaint Louis, MO
- Barnes-Jewish West County HospitalCreve Coeur, MO
- Missouri Baptist Medical CenterSaint Louis, MO
Industry payments (Open Payments)
- 2025$178.42 · 1 payment from 1 company
- 2024$1,094 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Davol Inc. | $178.42 | 1 |
What the 2025 payments were for
- Food and Beverage$178.42 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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