NPIMap

Individual provider Active NPI

Thomas P. McMahon, MD

  • Gastroenterology Physician
  • Wareham, MA
National Provider Identifier
1619048030
Registry record updated Feb 2, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Gastroenterology PhysicianTaxonomy code 207RG0100X
License
50774 Issued in MA
Practice address
100 Rosebrook Way
Wareham, MA 02571-1138
Phone
(508) 973-4974
Fax
(508) 273-4954
NPI assigned
Nov 10, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Feb 2, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Gastroenterology Physician 207RG0100X 6825 RI
Gastroenterology Physician 207RG0100X 50774 MA Primary

Addresses

Primary practice location

100 Rosebrook Way
Wareham, MA 02571-1138

Mailing address

200 Mill Rd
Fairhaven, MA 02719-5252
Phone (508) 973-2000

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in RI, MN, PA, MA4 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 4

Enrollment IDStateProvider typePAC IDDetails
I20080428000674 RI Practitioner - GastroenterologyPractitioner - Internal Medicine 5092893214 Reassigns benefits to 1 organization
I20240131004958 MN Practitioner - Gastroenterology 5092893214 Reassigns benefits to 1 organization
I20240625001029 PA Practitioner - Gastroenterology 5092893214 Reassigns benefits to 1 organization
I20260116000202 MA Practitioner - Gastroenterology 5092893214 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Gastroenterology
Education
Other, 1980
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Southcoast Physicians Group IncGroup PAC ID 0749171957, 875 clinicians
Geisinger ClinicGroup PAC ID 5395657001, 3,432 clinicians
Lakewood Health SystemGroup PAC ID 1052229671, shared by 15 NPIs, 107 clinicians

Practice addresses (Care Compare)

100 Rosebrook Way
Wareham, MA 02571-1138
Phone (508) 273-4900

1201 Oak St
Pittston, PA 18640-3798
Phone (570) 808-9800

49725 County
Staples, MN 56479-5280
Phone (218) 894-1515

Hospital & facility affiliations

Procedures performed for Medicare patients

ProcedureNumber of procedures
Colonoscopy24
Upper gastrointestinal (GI) endoscopy for acid reflux20

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
50774MAMDGastroenterology Physician
6825RIMDGastroenterology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Geisinger Clinic Current Accepting new patients
Geisinger Clinic CurrentSince May 20, 2024 Accepting new patients
Lakewood Health System CurrentSince Jan 8, 2024 Accepting new patients
Lakewood Health System CurrentSince Jan 8, 2024 Accepting new patients
Geisinger Clinic CurrentSince May 20, 2024 Accepting new patients
University Gastroenterology, LLC Gastroenterology CurrentSince Oct 10, 2010 Accepting new patients
Southcoast Physicians Group, Inc. CurrentSince Dec 15, 2025 Accepting new patients
Southcoast Physicians Group, Inc. CurrentSince Dec 15, 2025 Accepting new patients
Southcoast Physicians Group, Inc. Past Accepting new patients
Thomas P. McMahon, MD, Inc. Gastroenterology PastSince Dec 20, 1999 Accepting new patients

Locations

534 Prospect St
Fall River, MA 02720
Phone (508) 679-7766

100 Rosebrook Way
Wareham, MA 02571
Phone (508) 273-4900

49725 County 83
Staples, MN 56479
Phone (218) 894-1033

100 N Academy Ave
Danville, PA 17822

1201 Oak St
Pittston, PA 18640
Phone (570) 808-9800

675 Baltimore Dr
Wilkes Barre, PA 18702
Phone (570) 808-5757

110 Clock Tower Sq
Ste 100
Portsmouth, RI 02871
Phone (401) 293-5600

110 Clock Tower Sq
Fl Second
Portsmouth, RI 02871
Phone (401) 293-5600

110 Clock Tower Sq
Portsmouth, RI 02871
Phone (401) 293-5600

33 Staniford St
Providence, RI 02905
Phone (401) 274-1810

33 Staniford St
#2
Providence, RI 02905

Interoperability endpoints

  • Direct secure messaging: tmcmahon243284@direct.phs.org
  • Direct secure messaging: tmcmahon681488@direct.ochin.org

Organizations & group practices 10

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

Hospital & facility affiliations 22

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

View all 22

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1163116800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1769990400000",
    "number": "1619048030",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "200 MILL RD",
            "city": "FAIRHAVEN",
            "state": "MA",
            "postal_code": "027195252",
            "telephone_number": "508-973-2000",
            "fax_number": "508-973-2001"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 ROSEBROOK WAY",
            "city": "WAREHAM",
            "state": "MA",
            "postal_code": "025711138",
            "telephone_number": "508-973-4974",
            "fax_number": "508-273-4954"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MCMAHON",
        "first_name": "THOMAS",
        "middle_name": "P.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-11-10",
        "last_updated": "2026-02-02",
        "certification_date": "2026-02-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "RI",
            "license": "6825",
            "primary": false
        },
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "MA",
            "license": "50774",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Wareham, MA

Sources for this page

Verify at the official NPI Registry.