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Gearoid M McMahon

Gearoid M McMahon, MD

Nephrology

Highlights

Age Groups Seen

  • Adults
  • Geriatrics

Languages

  • Spanish
  • French
  • English

Gender

Male

Locations

  1. Brigham and Women's Faulkner Renal Clinic
  2. Brigham and Women's Renal Medicine Clinic

Expertise

Education

  • Fellowship: Brigham and Women's Hospital, Nephrology, 2014
  • Fellowship: Children's Hospital, Nephrology, 2010
  • Fellowship: St. Vincent's University Hospital, Nephrology, 2008
  • Fellowship: Beaumont Hospital, Nephrology, 2007
  • Fellowship: Waterford Regional Hospital, Geriatrics, 2005
  • Fellowship: Adelaide, Meath & National Children's Hospital incorporating the National Children's Hospital, Nephrology, 2004
  • Fellowship: Beaumont Hospital, Nephrology, 2003
  • Residency: Beaumont Hospital, Medicine, 2002
  • Residency: Mid-Western Regional Hospital, Surgery, 2000
  • Medical Education: University College Cork, 1999
  • Residency: Cork University Hospital, Internal Medicine, 1999

Insurance

Search plans
  • Aetna
  • Beech Street
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield Medicare
  • Cigna
  • Commonwealth Care Alliance
  • Coventry
  • Fallon Health
  • Harvard Pilgrim Health Care
  • Humana
  • Mass General Brigham Health Plan
  • MassHealth
  • Medicaid CT
  • Medicaid ME
  • Medicaid NH
  • Medicaid RI
  • Medicaid VT
  • Medicare
  • Medicare ACO
  • Multiplan
  • Railroad Medicare
  • Senior Whole Health
  • TriCare
  • Tufts Health Plan
  • Tufts Medicare Preferred
  • United Health Care
  • Wellpoint
  • WellSense

Ratings & Reviews

4.9 out of 5

105 ratings, 48 reviews

The Patient Satisfaction Rating is an average of all responses to the care provider related questions shown below from our survey. Patients that are treated in outpatient or hospital environments may receive different surveys, and the volume of responses will vary by question.

Search reviews
  • Reviewed on 4/5/2026

    Dr. McMahon explains things very clearly. He gives me all good inputs, what I need for my diet and things needed to avoid. I am grateful to have him as my care provider for my CKD treatment.

  • Reviewed on 4/5/2026

    I'm very happy with Dr. McMahon and feel fortunate to have gotten in his care.

  • Reviewed on 4/4/2026

    Excellent care as always! Dr McMahon is a wonderful and caring doctor.

  • Reviewed on 3/29/2026

    My experience was very good.

  • Reviewed on 3/29/2026

    Dr. McMahon was very personable and explained things in a manner that was understandable. He took the time to listen well and address any concerns.

  • Reviewed on 3/27/2026

    I found the visit with this provider and team very satisfying. They reviewed my medical history, recommended tests to confirm previous results, had an open discussion about other tests specifically to identify genetic traits. All in a very relaxed and professional setting.

  • Reviewed on 3/22/2026

    Dr. McMahon has always been thorough, informative and concerned about my kidney health. I had a three day stay at the Brigham, via the ED, a month before my scheduled checkup. When he arrived he had prepared for my visit by reviewing my hospital notes from my stay. We went over all of them and he explained and remarked on all of them. I am 100% secure in the care he gives me for my Kidney Disease. I would recommend him to anyone.

  • Reviewed on 3/21/2026

    The appointment went well

  • Reviewed on 3/18/2026

    Hi, I'd just like to say that I learned so much about where my kidneys were and what the plan would be and how to correct what's going on right now to keep some longevity and the next steps and the trajectory. I felt very comfortable that he reviewed and knew my kidney case very well as I'm a heart transplant patient and I was thoroughly happy.

  • Reviewed on 2/28/2026

    Dr McMahon is a caring person

  • Reviewed on 2/10/2026

    Without a doubt Dr. McMahon is the most attentive and professional physician with whom I have dealt. He listens and explains well, has a great personality and makes my appointments pleasurable.

  • Reviewed on 2/2/2026

    Knowledgeable, caring, responsive.

  • Reviewed on 2/4/2026

    Great attention to detail and good follow up plan.

  • Reviewed on 1/29/2026

    Dr. McMahon, a brilliant physician, is a thoughtful listener and highly skilled at helping the patient understand what can be complex medical issues. He immediately facilitates a tone of reassurance and support.

  • Reviewed on 1/28/2026

    He is very caring and professional.

  • Reviewed on 1/12/2026

    Overall, my experience was excellent. It's with for my mom to deal with her issues related to her kidneys. [redacted] We got to our appointment early and they were able to take us in early. Dr. McMahon and his team were very knowledgeable, competent, professional, friendly, all of those great things.

  • Reviewed on 1/4/2026

    thanks

  • Reviewed on 1/4/2026

    Always attentive, very kind.

  • Reviewed on 1/4/2026

    Dr. McMahon is both professional and kind. I feel grateful that he us on my team if physicians.

  • Reviewed on 12/29/2025

    Not enough room to give the in-depth accolades I would like concerning ALL aspects of my visit, from scheduling to the encounter itself, and with every individual involved. Most importantly, I was treated as an individual, a rarity today in medical practice. Also, at no time did I feel rushed, and I felt heard, even when I veered off the narrow topic of my particular medical condition.

  • Reviewed on 12/12/2025

    McMahon is the best I have ever seen Hands down most sophisticated !

  • Reviewed on 12/7/2025

    Dr. McMahon has been my physician for a long time. He has always concerned about my condition and worked to help me feel the best.

  • Reviewed on 12/9/2025

    Very comfortable talking with him. Does not put himself above other people, given his importance as a very good Nephrologist/MD. Follow up on office visit/lab results was very timely.

  • Reviewed on 12/7/2025

    DR McMahon is a true healer! He seems to care very much about my situation. Like many patients today my primary Internist (at Atrius Health in Concord) is on my Primary in name. I have never met him. My main concern is that my Nephrologist at MGBW and my Cardiologist at MGBW communicate. I think medicine in this day and age needs for Specialist to sort of but the general Internal Medicine parts of their training to good use. It seems like doing this is necessary in these crazy times when finding an Internist is nearly impossible.

  • Reviewed on 11/30/2025

    Dr. McMahon was very professional and knowledgeable about my medical history, medications and tests.

  • Reviewed on 11/30/2025

    Very satisfied with the experience.

  • Reviewed on 11/30/2025

    He always explain things in a timely and understanding manner. Does not rush through your visit with him, patiently listens to any concerns you might have; always recommends ways to improve your health in the future.

  • Reviewed on 11/22/2025

    Dr. McMahon is experienced, thoughtful, and supportive. I feel completely confident in his care. I recommend him highly.

  • Reviewed on 11/21/2025

    He is super friendly and knowledgeable. He makes me feel important.

  • Reviewed on 11/13/2025

    Dr was great. He questioned me and explained many things. He put my wife and I at ease about my condition. Seemed to be quite through. I would say that I would be very happy to recommend him to anyone needing kidney care.

  • Reviewed on 10/30/2025

    I appreciate the care I have been given by Dr. McMahon.

  • Reviewed on 10/27/2025

    Extremely knowledgeable and attentive to my needs. A very caring professional.

  • Reviewed on 10/12/2025

    Dr McMahon is just the best. I feel fortunate to be a patient in his practice.

  • Reviewed on 10/6/2025

    Professional kind

  • Reviewed on 10/4/2025

    The doctor is great

  • Reviewed on 9/26/2025

    Dr. McMahon was fantastic. Listened to my history and used the data available to him to explain my status in a clear understandable way. Suggested a plan for going forward that made total sense. Very professional and cordial. I feel like I'm in good hands!

  • Reviewed on 9/22/2025

    Dr.McMahon is the best of the best anyone can wish for! Everyday I count my blessings for having him in my life. He saved my life !

  • Reviewed on 9/13/2025

    The best doctor

  • Reviewed on 9/13/2025

    He is excellent! Lucky to have him!

  • Reviewed on 9/7/2025

    Doctor McMahon exceeded my expectations in all aspects of our thirty minute virtual visit. He carefully reviewed all my labs, surgeries, CT scans, and MRI exam before explaining how he will continue to take excellent care of me. He was an active listener and he answered all my questions. I consider myself very fortunate to have access to his expertise, articulation and empathy. Professional health providers like Doctor McMahon make Mass General Brigham a world class health care system.

  • Reviewed on 7/29/2025

    I left the Jamaica Plain Facility extremely satisfied with every aspect of my visit. When you walk into the hospital you can feel an aura of competence. These folks really have it together and I consider myself very fortunate to be a patient. This is a special place, from the receptionist to the physicians and everyone in between, I cannot laude enough praise their way. Kind, considerate and top care should be their motto. [redacted]

  • Reviewed on 7/13/2025

    He was very thorough and concerned regarding my problem.

  • Reviewed on 7/7/2025

    I felt a lot of empathy and care for my health outcome and wellness well-being

  • Reviewed on 7/6/2025

    Most courteous. Reviewed my status with recommendations for next six months. Answered all questions.

  • Reviewed on 6/22/2025

    He explained what the problem was . Dr McMahon answered all my questions and concerns.

  • Reviewed on 6/8/2025

    Extremely knowledgeable. Very personable.

  • Reviewed on 6/8/2025

    Over the past several years, I've seen three other nephrologists. None of them talked to me about the things that Dr. McMahon did.

  • Reviewed on 6/5/2025

    He is kind, respectful and listens.