Dr. Mark Detweiler, MD

Dr. Mark Detweiler, MD

Gastroenterology  ·  
Male  ·  
Age 65
Dr. Mark Detweiler, MD is a gastroenterology specialist in Londonderry, NH and has been practicing for 34 years. He graduated from Pennsylvania State University College Of Medicine in 1979 and specializes in gastroenterology, holistic medicine, and more.

1B Commons Dr Unit 9A

Londonderry, NH 03053

Contact Information

(603) 818-4712

Insurance Accepted

  • Aetna
  • AvMed
  • Blue Cross Blue Shield
  • Cigna
  • First Health (Coventry Health Care)
  • Harvard Pilgrim Health Care
  • Humana
  • Medicare
  • Tricare
  • UnitedHealthCare

*Please verify this information when scheduling an appointment.

Learn about Dr. Detweiler

Be confident in your decisions by checking out your provider's top areas of care, education, patient reviews and more. Learn about finding the right doctor for you.

Top Care Areas

See how frequently Dr. Detweiler performs your care needs compared to other doctors.

very high
more than 98% of peers
more than 87% of peers
Noninfectious Gastroenteritis and Colitis
more than 79% of peers

Dr. Detweiler's percentages are based on the rate of treatment compared to peers nationwide from insurance data. Learn more info about our data and this Top Care Areas component.

Care Philosophy

This content was provided by Dr. Detweiler "I am a doctor who takes time to listen to your concerns, and includes you in making decisions abut your care. When possible I prefer to avoid antibiotics and other prescription medications as they the often have unwanted side effects. I also prefer to treat the root cause of a problem rather than bandage over the symptoms."

3  Specialties

  • Gastroenterology
  • Applied Clinical Nutrition
  • Holistic Medicine

2  Board Certifications

  • Gastroenterology
    Accredited by: American Board of Internal Medicine*
  • Internal Medicine
    Accredited by: American Board of Internal Medicine*

67  Conditions Treated

Read Less

Background Check

Malpractice Claims not available

Healthgrades does not collect malpractice information for New Hampshire.

0 Sanctions

No sanctions history found for the years that Healthgrades collects data.

0 Board Actions

No board actions found for the years that Healthgrades collects data.


  • Lehigh University Bs Chemistry
    Undergraduate School | Graduated 1975
  • Pennsylvania State University College Of Medicine
    Medical School | Graduated 1979
  • University Vt Med Center Hospital
    Internship Hospital | Completed 1980
  • University Vt Med Center Hospital
    Residency Hospital | Completed 1981
  • University Utah Med Center
    Fellowship Hospital | Completed 1984

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Detweiler has no media or publications listed.

Languages Spoken

  • English

Memberships & Professional Affiliations

Dr. Detweiler does not have any memberships or affiliations listed. If you are Dr. Detweiler and would like to add memberships or affiliations, please update your profile.

Dr. Detweiler's Reviews

Likelihood of recommending Dr. Detweiler to family and friends
19 total reviews (6 have comments)

Likelihood to Recommend (19)

  • 5
  • 4
  • 3
  • 2
  • 1

Dr. Detweiler's Performance

  • Trustworthiness

  • Explains condition(s) well

  • Answers questions

  • Time well spent


Office & Staff Performance

  • Scheduling

  • Office environment

  • Staff friendliness

  • Average wait time

    10 to 15 minutes

Patient Comments (6)

Dr Detweiller is thorough, persistent and very knowledgeable. He takes time with his patients. I made no headway with my condition while seeing a gastroenterologist and then two different naturopaths. Treatment with Dr Detweiller has been successful! I’m thrilled that I found him. I recommend...more
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I've seen Dr. Detweiler probably 15 times in my life. Every time he's been the epitome of what a modern doctor should be. I would highly recommend Dr. Detweiler for anyone who is having any kind of significant digestive issue - his creative, driven approach has worked quite well for me.
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Dr. Detweiler is extremely thorough and knowledgeable specialist. He explains, in detail, test results, diagnosis, and treatment options. He does not have his own line of suppliments as a previous poster stated. He may make some supplement suggestions, but does not sell them. I have recommended...more
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Pushes his own supplements that he gets kickbacks on. Not willing to listen or go with what you choose for yourself. Breached my confidentiality. Not a good Dr. Has an anger management issue. See someone else.
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I am so impressed with Dr. D.Years of being dismissed by my sons pediatrician and telling me his symptoms were normal and no big deal left me frustrated; I knew something was not right so I went for another opinion w Dr.D. At the 1st visit he knew something was amiss, we did various tests and found...more
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