DR. WILLIAM C JR. CHAPMAN (MD) – Colon & Rectal Surgery Physician, NPI 1003297177
Colon & Rectal Surgery Physician
Main info
Doctor Profile
Contacts
Profile Insights
NPPES metrics only — not quality of care.
50 COLORECTAL SURGERY (PROCTOLOGY) in MO
Provider Addresses for DR. WILLIAM C JR. CHAPMAN (MD)
660 S. EUCLID AVE., BOX 8109
WASHINGTON UNIVERSITY SCHOOL MEDICINE, DEPT. OF SURGERY
ST. LOUIS, MO 63110
Phone: (314) 362-5000
Type: Mailing
1 BARNES JEWISH HOSPITAL PLAZA
BARNES JEWISH HOSPITAL PLAZA
ST. LOUIS, MO 63110
Phone: (314) 362-5000
Type: Location
PO BOX 7412011
CHICAGO, IL 606742011
Phone: (314) 454-7177
Fax: (888) 425-7946
Type: Mailing
1044 N MASON RD
DIV SURG COLON/RECTAL, STE 310
SAINT LOUIS, MO 631416431
Phone: (314) 454-7177
Fax: (888) 425-7946
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 4 Open Payments records for all available years, with a total value of $1,175.
Total Amount is formed as General ($1,175) + Research ($0) + Ownership ($0) = $1,175.
Last reported payment date: 2024-07-19 • Largest payer in this snapshot: Intuitive Surgical, Inc. ($1,123).
Total Amount
$1,175
General + Research + Ownership
Payments
4
Total payment records
General Amount
$1,175
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-07-19
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Intuitive Surgical, Inc. | $1,123 |
| Medtronic, Inc. | $52 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2023-06-06
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20230606000999 | I | Colorectal Surgery (Proctology) | MO | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 23 | 23 | $0 |
Insurance plans in this area (ZIP 63110)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | MO | |
| - | MO | |
| - | FL | |
| - | MO | |
| Diagnostic Radiology | IL | |
| - | IL | |
| - | MO | |
| - | MO | |
| - | MO | |
| - | MO |
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