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Internist, Gastroenterologist (digestive)
35 years of experience
Accepting new patients
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 (1)

The overall average patient rating of Dr. John Allen is Average. Dr. Allen has been reviewed by 2 patients who have provided 1 comments. The rating is 3 out of 5 stars.

Patient Ratings
Ease of Appointment 1.0
Promptness 1.0
Courteous Staff 1.0
Accurate Diagnosis 3.7
Bedside Manner 1.0
Spends Time with Me 1.0
Follows Up After Visit 1.0

Specialties & Research

Dr. John Allen, MD is board certified in Internal Medicine and Gastroenterology.

  • He has special expertise in 8 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Colonoscopy
  • Constipation
  • Gastroparesis
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Sigmoidoscopy
  • Ulcerative Colitis

Education & Awards

Dr. Allen graduated from University of New Mexico , Albuquerque.


Dr. Allen has 8 hospital affiliations:

  • St Francis Regional Medical Center 
  • Abbott - Northwestern Hospital Inc 

> > > > Dr. John Allen, MD

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Additional Information
Dr. John Irvin Allen MD is a male Internist, has 35 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. John I. Allen practice?
Dr. John Allen has 8 office locations.
Dr. John Allen practices Internal Medicine and Gastroenterology near New Haven, CT.
Additional practice locations include: Minneapolis, MN and Saint Paul, MN.
See New Haven Internists and New Haven Gastroenterologists.