background
background
Dr. John McMahon, DO

Dr. John McMahon, DO

Internal Medicine*
15+ years of experience

Dr. John McMahon, DO is an internist in Portsmouth, NH and has over 15 years of experience in the medical field. He graduated from University of New England College of Osteopathic Medicine in 2008. He is affiliated with York Hospital. He is not accepting new patients.

5 Star Rating
Based on 116 reviews 5 Star Rating (116 reviews)

Atlantic Orthopaedics and Sports Medicine

1900 Lafayette Rd Portsmouth, NH 03801
Patient Favorite Award

Dr. McMahon is a patient favorite Internist

The Patient Favorite badge is awarded to top-performing providers who surpass average ratings and comments, reflecting their commitment to exceptional patient care. Read our methodology

Experience Check

Search for experience in a specific area

Dr. McMahon's Reviews

Likelihood to recommend Dr. McMahon

5.0
116 ratings, 98 with a written review
5 star
98%
98%
4 star
1%
1%
3 star
0%
0%
2 star
1%
1%
1 star
0%
0%

Your trust is our top concern.

We strive to keep reviews honest, trustworthy, and fair.

Doctors can not pay for good reviews, nor can they pay to have negative reviews removed.

We monitor all reviews to ensure they comply with our guidelines and don’t include personal information, profanity, libel, defamation, harassment, obscenity or fraud.

Any reviews that are deemed fraudulent or violate our guidelines will be removed immediately.

All reviews are confirmed and audited before publication, and community members have the ability to flag inappropriate content for further review by our team.

Cortisone Hip Injection Maestro!
I never had a cortisone shot into my hip bursa. I was very nervous. Needles and I don't get a long! Dr McMahon came highly recommended and did not disappoint. He was very personable and explained what he was doing. He used an ultrasound to get the best place to put the medicine, gave me a numbing injection which was not bad at all, and then the cortisone shot. I didn't feel the shot so much as the medication going in- which was a little pressure, but not pain. Before I knew it, he was done! Now, I'm waiting for it to kick in so I can do some strengthening exercises.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Karen Anderson – Mar 20, 2025
×Post a ResponseAre you Dr. McMahon?
Great experience
Telehealth
Not only a great professional in all aspects but great bedside manner. Extremely helpful for current and future suggestions on moving forward.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
JoAnne Hayes – Mar 18, 2025
×Post a ResponseAre you Dr. McMahon?
He explains things well and with a friendly manner
He seemed like he was not just going through a process. I think he really cares about his patient.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Roland – Jan 31, 2025
×Post a ResponseAre you Dr. McMahon?
highly likely
great bedside manner, very kind and helpful
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Katie Matthews – Jan 24, 2025
×Post a ResponseAre you Dr. McMahon?
Very Likely
Dr. McMahon was very friendly and engaging with me as he prepared me for my procedure. He explained what to expect and delivered.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Jan 17, 2025
×Post a ResponseAre you Dr. McMahon?
Very satisfied patient
Dr. McMahon was very personable, explained the procedure in terms that were easily understood As well as the expected outcome, and time frame. I would not have ANY hesitation to see him again should it be necessary. Consider myself most fortunate to be a patient of this practice.
What went well
  • I felt respected
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
What could be improved
No results
Helpful
Jan 15, 2025
×Post a ResponseAre you Dr. McMahon?
THE Best!!!
Compassion… professionalism… humorThe ideal combination, and he meets it! The staff are awesome, too!
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
June – Jan 07, 2025
×Post a ResponseAre you Dr. McMahon?
Great office visit
Dr. McMahon provides great advice. He takes the time to discuss health issues and options to help. He is very easy to talk with and ensures that you understand what is explained.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
John Sampson – Dec 20, 2024
×Post a ResponseAre you Dr. McMahon?
Highly recommended
Dr McMahon is a skilled professional with consistent results. He has a great personality which is a plus!!
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Yvette Bailey – Dec 20, 2024
×Post a ResponseAre you Dr. McMahon?
He is so awesome! Smart and nice!! I highly recomend
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Maria Horvath – Dec 19, 2024
×Post a ResponseAre you Dr. McMahon?
Very good customer service.
Very good customer service!
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Dec 12, 2024
×Post a ResponseAre you Dr. McMahon?
'Consistently Top-Notch'
I've been seeing Dr. McMahon for a couple of different issues for 6-7 years. He continues to be among the very best doctors with whom I have ever interacted. He is always pleasant, approachable, professional, informative, and skilled at what he does..
What went well
  • I felt respected
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
No results
Helpful
Roger Barzelay – Dec 07, 2024
×Post a ResponseAre you Dr. McMahon?
Cortisone injections
Very precise and explanation on procedure is very clear and helpful.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Nov 21, 2024
×Post a ResponseAre you Dr. McMahon?
Telehealth
He is wonderful, makes you feel very comfortable. Highly Recommend I have been going to him for several years.
What went well
  • I felt respected
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
What could be improved
  • Difficult to schedule appointment
Helpful
Catherine Foley – Nov 13, 2024
×Post a ResponseAre you Dr. McMahon?
Great experience every time
I have been seeing Dr McMahon for quite some time. He treated me w steroid injections for my hips initially and most recently for my left shoulder. Hands down he is one of the best! Extremely knowledgeable, caring and has a great sense of humor. I would not hesitate to recommend him!! The entire practice consists of doctors who are the best in the field in my opinion!
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Tina DiPietrantonio – Oct 24, 2024
×Post a ResponseAre you Dr. McMahon?
Dr.McMahon, is very pleasant, very knowledgeable!
Dr McMahon gives me shots in my ankle every 3 months to keep me walking he does a really good job and checks him with me every time, to make sure it's still working, very pleasant bedside manner. I would recommend him to everyone!
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
1 other person found this helpful
Helpful
Trigger point injection – Oct 13, 2024
×Post a ResponseAre you Dr. McMahon?
Explained the process thoroughly. I did not feel uncomfortable at all.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Oct 12, 2024
×Post a ResponseAre you Dr. McMahon?
Great experience
Dr. McMahon and staff were extremely helpful knowledgable and talented. The process was well explained and completed.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Gary Hannafin – Oct 09, 2024
×Post a ResponseAre you Dr. McMahon?
The injection must felt like a mosquito bite. Pain away in two days.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Oct 07, 2024
×Post a ResponseAre you Dr. McMahon?
Excellent professional care by both the doctor and his entire staff. Highly recommended.
What went well
  • I felt respected
  • Appointment scheduling
  • Listened & answered questions
  • Explained conditions well
  • Staff friendliness
  • Appointment wasn't rushed
  • Trusted the provider's decisions
  • Wait times
What could be improved
No results
Helpful
Anthony Viola MD – Oct 04, 2024
×Post a ResponseAre you Dr. McMahon?

Leave a review

How was your experience with Dr. McMahon?

About Me

biography

Dr. John McMahon, DO is an internist in Portsmouth, NH and has over 15 years of experience in the medical field. He graduated from University of New England College of Osteopathic Medicine in 2008. He is affiliated with York Hospital. He is not accepting new patients.
  • Internal Medicine

  • Orthopedic Sports Medicine

  • Bone & Joint Non-Surgical Orthopedics

*Healthgrades does not verify qualifications for medical specialties. Please verify your provider's specialty and qualifications directly with your provider and applicable medical board.

  • University Of New England College Of Osteopathic Medicine

    Medical School, 2008
American Board of Medical Specialties®
American Board of Emergency Medicine®
Sports Medicine
For detailed information about any of the below board actions, please search for the provider's records on the linked state licensing board or the Federation of State Medical Boards. To learn more about the difference between these sources, please refer to our FAQs.
Healthgrades has not received any data indicating a board action exists for this provider.
Patient Favorite Award

Dr. McMahon is a patient favorite Internist

    Read our methodology

    Online Care for Prescription Refills (Sponsored)

    Insurance Check

    Search for your insurance carrier and choose your plan type

    Locations

    Atlantic Orthopaedics and Sports Medicine

    Atlantic Orthopaedics and Sports Medicine1900 Lafayette Rd Portsmouth, NH 03801
    1
    Atlantic Orthopaedics and Sports Medicine16 Hospital Dr York, ME 03909
    2