Thomas P. McMahon, MD
Gastroenterology Physician · Wareham, MA
Thomas P. McMahon, MD is a gastroenterology physician with a practice address in Wareham, Massachusetts, and NPI 1619048030, issued on Nov 10, 2006. Check the license (Massachusetts 50774, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Thomas P. McMahon
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 50774 MA
6825 RI
Self-reported in NPPES; status is on the state search - Practice location
- 100 Rosebrook Way, Wareham, MA 02571
- Phone
- (508) 973-4974
- Enumerated
- Nov 10, 2006
- Record last updated
- Feb 2, 2026
- Fax
- (508) 273-4954
- Medicare enrollment
- Enrolled (PECOS I20260116000202); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 686 in Massachusetts → Look up another NPI →
Also registered at 100 Rosebrook Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Bethany Abde, AGNP - BCAdult Health Nurse Practitioner1215331566
- Andrew Arone, MS, RDRegistered Dietitian1689407769
- Colleen Berg, N.P.Nurse Practitioner1477628527
- Bruce Brown, MDCardiovascular Disease Physician1205896362
- Alexa BrynildsenNurse Practitioner1720770886
- Victoria Cabral, DNP, AGPCNP-BCNurse Practitioner1588115356
Verify Thomas P. McMahon in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 50774Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average gastroenterology physician in 2024
59 Medicare Part D claims for 36 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
3 hospitals and group practices
- Geisinger ClinicPittston, PA
- Lakewood Health SystemStaples, MN · Critical Access Hospitals
- Southcoast Physicians Group IncWareham, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov).
Thomas P. McMahon among 686 gastroenterology physician records in Massachusetts
Thomas P. McMahon, MD is one of 686 gastroenterology physician records with a practice address in Massachusetts. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 49% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1980 · median 2004 among the 491 with a school on file
- Record last updated2026 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Massachusetts
There are 686 gastroenterology physician records in Massachusetts.
All 686 in Massachusetts → Every provider in Wareham → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Kevin Murphy, MDWareham, MA 025711922066489
- Michael Feuer, MDHyannis, MA 026011518910777
- Harold Levine, M.D.Hyannis, MA 026011750321295
- Alexandre Nader, M.D.Hyannis, MA 026011518914100
- Paul Siegel, M.D.Hyannis, MA 026011578571246
- Jay Yamin, M.D.Hyannis, MA 026011285617100
- Joseph Cobb, MDFalmouth, MA 025401740230846
- Xiang-Yang Guo, MDFalmouth, MA 025401245282508
Common questions
What is Thomas P. McMahon, MD's NPI number?
Thomas P. McMahon, MD's National Provider Identifier (NPI) is 1619048030, issued on Nov 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas P. McMahon, MD located?
The NPPES record lists a practice address at 100 Rosebrook Way, Wareham, MA, 02571. Phone: (508) 973-4974. Providers update this record themselves, so call before visiting.
How can I verify Thomas P. McMahon, MD's license?
NPPES lists Massachusetts license number 50774, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas P. McMahon, MD prescribe under Medicare Part D?
In 2024, Thomas P. McMahon, MD had 59 Medicare Part D claims for 36 beneficiaries; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.