Physician Profile
Joan M. McMahon, MD
Unclaimed ProfileAbout Dr. Mcmahon
Joan M. McMahon, MD is a healthcare provider in Lewistown, MT specializing in internal medicine. Joan trained at Saint Louis University School of Medicine, graduating in 1996.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (406) 535-1502
- Email not available
Practice Locations
408 WENDELL AVE
Lewistown, MT 59457
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 18 related providers in 3 groups
Other internists in Lewistown 2
Same specialty, same city.
Trained at Saint Louis University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1996 at Saint Louis University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What does Dr. McMahon specialize in?
Dr. McMahon is an internist in Lewistown, MT. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where is Dr. McMahon located?
Dr. McMahon is listed at 408 Wendell Ave, Lewistown, MT 59457. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. McMahon's phone number?
The number on file is (406) 535-1502. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is the NPI for Dr. McMahon?
Dr. McMahon's National Provider Identifier is 1467403345. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. McMahon go to medical school?
Dr. McMahon attended Saint Louis University School of Medicine, graduating in 1996. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. McMahon have?
Dr. McMahon has 30 years experience. Calculated from a graduation year of 1996, reported in the CMS National Downloadable File.
CMS public data
Is Dr. McMahon's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. McMahon. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.