Dr. Mark Detweiler, MD

Dr. Mark Detweiler, MD

Gastroenterology  |  
Male  |  
Age 64
Insurances AcceptedSave
Dr. Mark Detweiler, MD is a gastroenterology doctor who practices in Londonderry, NH. He is 64 years old and has been practicing for 38 years.

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

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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.

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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."


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  • Gastroenterology
  • Applied Clinical Nutrition
  • Holistic Medicine

Board Certifications

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

Conditions Treated

  • Abdominal Disorders
  • Abdominal Pain
  • Abscess
  • Anal or Rectal Pain
  • Anemia
  • Autoimmune Diseases
  • Bacterial Infections of the Digestive Tract
  • Candida Albicans Fungus Allergy
  • Celiac Disease
  • Cirrhosis
  • Colitis
  • Colon Disorders
  • Constipation
  • Crohn's Disease
  • Dehydration
  • Diaphragmatic and-or Hiatal Hernia
  • Diarrhea
  • Diverticulitis, Intestinal
  • Diverticulosis, Intestinal
  • Duodenal Ulcer
  • Duodenitis
  • Dysentery
  • Dysphagia
  • Enteritis
  • Esophageal Achalasia and Cardiospasm
  • Esophageal Diseases
  • Esophageal Ulcer
  • Esophagitis
  • Fungal Infections
  • Gas-Bloat Syndrome
  • Gastric Ulcer
  • Gastritis
  • Gastroesophageal Reflux Disease (GERD)
  • Gastrointestinal Diseases
  • Gastrointestinal Malabsorption
  • Gastroparesis
  • Gluten Sensitivity
  • Heartburn
  • Hemochromatosis
  • Hemorrhoids
  • Hepatic Encephalopathy
  • Hepatitis
  • Hepatitis C
  • Hepatopulmonary Syndrome
  • Indigestion
  • Inflammatory Bowel Disease
  • Invasive Candidiasis
  • Irritable Bowel Syndrome
  • Lactose Intolerance
  • Liver Damage from Alcohol
  • Malnutrition
  • Nausea
  • Non-Alcoholic Fatty Liver Disease
  • Non-Neonatal Jaundice
  • Noninfectious Gastroenteritis and Colitis
  • Pancreatitis
  • Peptic Ulcer
  • Pyloric Stenosis
  • Reflux Esophagitis
  • Stomach Cancer
  • Stomach Diseases
  • Stomach and Small Intestine Cancer
  • Ulcer
  • Ulcerative Colitis
  • Unexplained Weight Loss
  • Viral Hepatitis
  • Vomiting Disorders


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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
based on 17 total reviews (3 with comments)
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 (3)
NH |
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.
in Hudson, NH |
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 the problem.He explained things to my son so he could understand and how HE Had to take control of his issue and it made a huge impact.Dr D sees both my sons and I could not be more grateful.
Londonderry, NH |
Scary! Received a summary of visit a few days after my appointment. Confused me with another patient. Listed symptoms I never had, but never mentioned the symptoms I did have. Wouldn't return my call. He Got indignant when I told receptionist- no nurses - what happened. Said I could make an additional appointment to get my symptoms right . Guess his mistakes are my fault?
This patient was not confused with anyone else. Symptoms are recordeed as given to me or as recorded in records released to me from other providers. My average preparation time for new patients is 45 minutes and includes careful review of the patient's own report of their issues. If this patient's assertions are true, I would have violated all of my operating practices. I do not know what the real problem here is as I can not identify the patient. This is totally opposite to my other reviews.
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Now Accepting New Patients
This provider offers the following appointment availability:
Dr. Detweiler accepts 10 insurance carriers
  • Aetna
    Aetna HMO
    Choice Plus POS II
  • AvMed
    Open Access
  • Blue Cross Blue Shield
    Blue Card PPO
  • Cigna
    Cigna HMO
    Cigna PPO
    Great West Healthcare-Cigna PPO
  • First Health (Coventry Health Care)
    First Health (Coventry Health Care) PPO
  • Harvard Pilgrim Health Care
    Harvard Pilgrim Health Care PPO
  • Humana
    Choice Care PPO
  • Medicare
    Special Needs Plan SNP
  • Tricare
    TriCare for Life
  • UnitedHealthCare
    Choice Plus POS
    Options PPO

*Please verify this information when scheduling an appointment.

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