Doctor profile · Federal record
Dr. William Chapman, MD
Colon & Rectal Surgery Physician (CMS: Colorectal Surgery (Proctology)) · Surgery Physician · Saint Louis, MO
- NPI 1003297177
- Accepts Medicare
- MIPS 79.3 / 100 · 2023
- 11 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1044 N Mason RD, Div Surg Colon/Rectal, Ste 310
Saint Louis, MO 631416431
(314) 454-7177
fax (888) 425-7946 - Mailing address
-
Po Box 7412011
Chicago, IL 606742011
Credentials & registration
- NPI registered
- June 2015 — 11 yrs on file
- Profile last updated
- April 15, 2025
- Year of graduation
- 2015 — 11 yrs since
- Specialty taxonomy
- 208C00000X — NUCC code
- State license (1)
- Missouri #2017007784
- Medicaid
- MO #200044671
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1003297177. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
23
Distinct HCPCS
1
Medicare allowed
$3,720
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99204 |
New patient office or other outpatient visit, 45-59 minutes | 23 | 23 | $162 |
In context: peer comparison
Among 9 peers in this city , average services per provider: 28. This provider delivers 0.8× the peer median.Open Payments
Industry payments received
All-time total
$1,094
Transactions
2
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| INTUITIVE SURGICAL, INC. | 2 | $1,094.20 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
62
Patients
57
Total drug cost
$1,086
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Metronidazole | Generic | 21 | 19 | $33 |
| Neomycin Sulfate | Generic | 16 | 15 | $107 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,mag Sulfates) | Brand | 13 | 11 | $909 |
| Ondansetron Odt (Ondansetron) | Brand | 12 | 12 | $37 |
Hospital affiliations
Frequently asked questions
What is Dr. William Chapman's medical specialty?
Dr. William Chapman practices Colon & Rectal Surgery Physician in Saint Louis, MO.
Where does Dr. William Chapman practice?
Dr. William Chapman practices at 1044 N Mason RD, Saint Louis, MO 631416431. Office phone: 3144547177.
What is Dr. William Chapman's NPI?
Dr. William Chapman's National Provider Identifier (NPI) is 1003297177, issued by NPPES.
Does Dr. William Chapman accept Medicare assignment?
Yes. Dr. William Chapman accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Chapman commonly perform?
Top Medicare-reported procedures in 2023: New patient office or other outpatient visit (HCPCS 99204). Source: CMS Medicare Physician & Other Practitioners file.