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License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (4)

The overall average patient rating of Dr. Graham McMahon, Endocrinologist is Excellent. Dr. McMahon has been reviewed by 10 patients who have provided 4 comments. The rating is 5 out of 5 stars.

Patient Ratings
Ease of Appointment 3.8
Promptness 4.8
Courteous Staff 4.7
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0
Follows Up After Visit 5.0

Specialties & Research

Dr. Graham McMahon, MD, MMSC is board certified in Internal Medicine.

  • He has special expertise in 6 areas:
  • Adrenal Gland Diseases
  • Diabetes
  • Diabetes
  • Hyperthyroidism
  • Hypothyroidism
  • Thyroid Diseases

Education & Awards

Dr. McMahon graduated from Royal College Of Surgeons In Ireland, Dublin. He has 3 awards.

Patients' Choice Award (2008 - 2011, 2013 - 2014)
Compassionate Doctor Recognition (2009 - 2011, 2013 - 2014)
On-Time Doctor Award (2009, 2014)


Dr. McMahon has 4 hospital affiliations:

  • Brigham and Women's Hospital 
  • Faulkner Hospital 


  • Portuguese
  • Spanish
  • Russian

> > > > Dr. Graham McMahon, MD, MMSC

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Additional Information
Dr. Graham Thomas McMahon MD and MMSC is a male Internist, has 14 years of experience and practices in Internal Medicine.
Where does Dr. Graham T. McMahon practice?
Dr. Graham McMahon has 1 office location.
Dr. Graham McMahon practices Internal Medicine near Boston, MA.
See Boston Internists.