THOMAS P. MCMAHON (MD) – Gastroenterology Physician, NPI 1619048030
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
1,158 INTERNAL MEDICINE in RI
Provider Addresses for THOMAS P. MCMAHON (MD)
110 CLOCK TOWER SQ
PORTSMOUTH, RI 028711396
Phone: (401) 293-5600
Fax: (401) 293-5604
Type: Mailing
100 ROSEBROOK WAY
WAREHAM, MA 025711138
Phone: (508) 973-4974
Fax: (508) 273-4954
Type: Location
200 MILL RD
FAIRHAVEN, MA 027195252
Phone: (508) 973-2000
Fax: (508) 973-2001
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 8 Open Payments records for all available years, with a total value of $155.
Total Amount is formed as General ($155) + Research ($0) + Ownership ($0) = $155.
Last reported payment date: 2023-12-12 • Largest payer in this snapshot: ABBVIE INC. ($107).
Total Amount
$155
General + Research + Ownership
Payments
8
Total payment records
General Amount
$155
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-12-12
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| ABBVIE INC. | $107 |
| NESTLE HEALTHCARE NUTRITION INC. | $49 |
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: 2026-01-16
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 4 Medicare enrollment records; no due dates published yet.
Enrollment records
4
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 |
|---|---|---|---|---|
| I20080428000674 | I | Gastroenterology | RI | TBD |
| I20240131004958 | I | Gastroenterology | MN | TBD |
| I20240625001029 | I | Gastroenterology | PA | TBD |
| I20260116000202 | I | Gastroenterology | MA | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 28 | 23 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 26 | 26 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 23 | 22 | $0 |
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 13 | 13 | $0 |
| 45380 | Biopsy of large bowel using a flexible endoscope | 12 | 12 | $0 |
Insurance plans in this area (ZIP 02871)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Nurse Practitioner | MN | |
| Clinical Social Worker | MN | |
| Family Practice | MN | |
| Nurse Practitioner | MN | |
| - | MN | |
| Certified Registered Nurse Anesthetist (Crna) | MN | |
| Internal Medicine, Pulmonary Disease, Pulmonary Disease, Internal Medicine, Critical Care (Intensivists), Critical Care (Intensivists) | IA | |
| O B S T E T R I C S/ G Y N E C O L O G Y | MN | |
| Emergency Medicine, Family Practice | MN | |
| Diagnostic Radiology | MN |
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