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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).

Learn more about Dr. Norman Callahan:

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  1. Qualifications
  2. What's important to you

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Patient Reviews

Patient comments (4)

The overall average patient rating of Dr. Norman Callahan is Good. Dr. Callahan has been reviewed by 6 patients who have provided 4 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 3.0
Promptness 2.8
Courteous Staff 4.3
Accurate Diagnosis 3.0
Bedside Manner 3.0
Spends Time with Me 3.0
Follows Up After Visit 3.0

Specialties & Research

Dr. Norman Callahan, DO is board certified in Internal Medicine and Gastroenterology.

  • He has special expertise in 5 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Constipation
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Callahan graduated from Philadelphia College of Osteopathic Medicine.


Dr. Callahan has 7 hospital affiliations:

  • Main Line Hospital - Bryn Mawr 
  • Bryn Mawr Rehabilitation Hospital 

> > > > Dr. Norman Callahan, DO

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Additional Information
Dr. Norman Mattock Callahan DO is a male Internist, has 20 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. Norman M. Callahan practice?
Dr. Norman Callahan has 1 office location.
Dr. Norman Callahan practices Internal Medicine and Gastroenterology near Malvern, PA.
See Malvern Internists and Malvern Gastroenterologists.