DR. CHARLES WILLIAM MCMAHON (M.D.) – Gastroenterology Physician, NPI 1861768053
Gastroenterology Physician
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Doctor Profile
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Profile Insights
NPPES metrics only — not quality of care.
978 GASTROENTEROLOGY in IL
Provider Addresses for DR. CHARLES WILLIAM MCMAHON (M.D.)
2160 S 1ST AVE
MAYWOOD, IL 601533328
Phone: (708) 216-9000
Type: Mailing
4321 WASHINGTON ST STE 5600
KANSAS CITY, MO 641115936
Phone: (816) 561-2000
Type: Mailing
4401 Wornall Rd
Kansas City, MO 641113220
Phone: (816) 932-0257
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 65 Open Payments records for all available years, with a total value of $1,229.
Total Amount is formed as General ($1,229) + Research ($0) + Ownership ($0) = $1,229.
Last reported payment date: 2024-12-11 • Largest payer in this snapshot: ABBVIE INC. ($503).
Total Amount
$1,229
General + Research + Ownership
Payments
65
Total payment records
General Amount
$1,229
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-12-11
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $503 |
| Ardelyx, Inc. | $186 |
| Celgene Corporation | $88 |
| Celltrion USA Inc. | $66 |
| Daiichi Sankyo 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: 2021-05-04
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 |
|---|---|---|---|---|
| I20210504001504 | I | Gastroenterology | 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 |
|---|---|---|---|---|
| 45380 | Biopsy of large bowel using a flexible endoscope | 169 | 168 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 162 | 160 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 111 | 110 | $0 |
| 99231 | Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 35 | 27 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 26 | 24 | $0 |
Insurance plans in this area (ZIP 60153)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| G A S T R O E N T E R O L O G Y | MO | |
| G A S T R O E N T E R O L O G Y | MO | |
| G A S T R O E N T E R O L O G Y | KS | |
| - | MO | |
| G A S T R O E N T E R O L O G Y | MO | |
| - | MO | |
| Physician Assistant | KS |
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