Dr. Thomas J. McMahon
- Gender: Male
- Experience: 32 years
- Graduated from: Oregon Health Sciences University School Of Medicine
- Graduation year: 1989
- Sole propriator: No
- NPI: 1558399709
Dr. Thomas J. McMahon MD
Surgeon
He is located at 305 West Pennsylvania Avenue in Anaconda, MT 59711. Can help patients with the following: Anal Fissure, Cancer, Collapsed Lung, Cyst, Lymphedema, Ulcerative Colitis. His National Provider Identifier (NPI) number is 1558399709. Appointment can be made via the phone number (406) 563-8571. He is affiliated with 1 practices and 3 hospitals.
Conditions treated
Dr. Thomas J. McMahon, being an surgeon, treats the following conditions. Please be advised that this list may not be complete. For the full list of conditions treated, consult directly with Dr. Thomas J. McMahon.
- Achalasia
- Anal Fissure
- Aortic Dissection
- Aortic Stenosis
- Appendicitis
- Boils
- Cancer
- Collapsed Lung
- Colon Cancer
- Crohn's Disease
- Cyst
- Diverticulosis
- Enlarged Spleen
- Esophageal Cancer
- Gallstones
- Gangrene
- Heart Disease
- Hemorrhoids
- Hernia
- Inflammatory Bowel Disease (IBD)
- Lymphedema
- Pancreatitis
- Peptic Ulcer
- Pilonidal Cyst
- Sebaceous Cyst
- Thoracic Outlet Syndrome (TOS)
- Ulcerative Colitis
- Ventricular Septal Defect (VSD)
Procedures Performed by Dr. Thomas J. McMahon
ACA Marketplace (Obamacare/HealthCare.gov) plan networks
Insurers selling ACA Marketplace (HealthCare.gov) plans list Dr. Thomas J. McMahon as in-network for the following 2026 plans.
Health plans
Mountain Health CO-OP
Network data as of Sep 15, 2026, as reported by the insurer.
Show all 22 plans from Mountain Health CO-OP
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| PEAK PPO BRONZE | PPO · Expanded Bronze | Preferred | Accepting new patients |
| Peak PPO Bronze HDHP | PPO · Expanded Bronze | Preferred | Accepting new patients |
| PEAK PPO BRONZE HDHP | PPO · Expanded Bronze | Preferred | Accepting new patients |
| Peak PPO Bronze Standard | PPO · Expanded Bronze | Preferred | Accepting new patients |
| Peak PPO Catastrophic | PPO · Catastrophic | Preferred | Accepting new patients |
| Peak PPO Gold | PPO · Gold | Preferred | Accepting new patients |
| PEAK PPO GOLD | PPO · Gold | Preferred | Accepting new patients |
| PEAK PPO GOLD HDHP | PPO · Gold | Preferred | Accepting new patients |
| Peak PPO Gold Standard | PPO · Gold | Preferred | Accepting new patients |
| Peak PPO Silver | PPO · Silver | Preferred | Accepting new patients |
| PEAK PPO SILVER | PPO · Silver | Preferred | Accepting new patients |
| PEAK PPO SILVER HDHP | PPO · Silver | Preferred | Accepting new patients |
| Peak PPO Silver Standard | PPO · Silver | Preferred | Accepting new patients |
| Plus Bronze (2 plan variants) | PPO · Expanded Bronze | Tier Two | Accepting new patients |
| Plus Bronze HDHP | PPO · Expanded Bronze | Tier Two | Accepting new patients |
| Plus Bronze Standard | PPO · Expanded Bronze | Tier Two | Accepting new patients |
| Plus Gold (2 plan variants) | PPO · Gold | Tier Two | Accepting new patients |
| Plus Gold HDHP | PPO · Gold | Tier Two | Accepting new patients |
| Plus Gold Standard | PPO · Gold | Tier Two | Accepting new patients |
| Plus Silver | PPO · Silver | Tier Two | Accepting new patients |
| Plus Silver HDHP | PPO · Silver | Tier Two | Accepting new patients |
| Plus Silver Standard | PPO · Silver | Tier Two | Accepting new patients |
This covers ACA Marketplace plans only, as reported by each insurer. It does not include employer, Medicare Advantage, or state-run exchange plans, and a plan missing from this list does not mean Dr. Thomas J. McMahon is out of network. Insurer directories can be out of date, so always confirm with the insurer and the office before your visit.
Medicare Enrollment
Dr. Thomas J. McMahon is enrolled to bill Medicare as a Practitioner - General Surgery (also registered under: Practitioner - Thoracic Surgery) .
Bills through: Community Hospital Of Anaconda
Based on Medicare's public enrollment records as of Jul 17, 2026. This reflects Medicare fee-for-service enrollment only and says nothing about other insurance, quality, outcomes, or board certification.
Payments received
Drug payment
| Nuvasive | $2695 |
| Aesculap | $1055 |
Other
| Travel and Lodging | $3495 |
| Food and Beverage | $255 |
Studies
OREGON HEALTH SCIENCES UNIVERSITY SCHOOL OF MEDICINE
Graduated in 1989Additional Specialities
- Cardiothoracic Surgeon
Affiliated hospitals
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Questions & Answers
What conditions does Dr. Thomas J. McMahon treat?
Dr. Thomas J. McMahon provides treatment for Anal Fissure, Cancer, Collapsed Lung, Cyst, Lymphedema, Ulcerative Colitis. For the full list see this list.
Has Dr. Thomas J. McMahon affiliation with hospitals?
Dr. Thomas J. McMahon is affiliated with COMMUNITY HOSPITAL OF ANACONDA. For the full list of hospitals see this list.
Where can you meet with Dr. Thomas J. McMahon?
Dr. Thomas J. McMahon's office is located at 305 West Pennsylvania Avenue in Anaconda, MT 59711.
Does Dr. Thomas J. McMahon have affiliation with practices?
Dr. Thomas J. McMahon is affiliated with Providence Health & Services Mt..
Does Dr. Thomas J. McMahon accept patients with Mountain Health CO-OP?
Yes, Dr. Thomas J. McMahon is listed in-network for Mountain Health CO-OP through the ACA Marketplace (Obamacare/HealthCare.gov). See the Marketplace plans section for details.