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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).

Patient Reviews

Patient comments (0)

The overall average patient rating of Dr. John Marshall is Good. Dr. Marshall has been reviewed by 5 patients who have provided 0 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 5.0
Promptness 5.0
Courteous Staff 5.0
Accurate Diagnosis 5.0
Bedside Manner 5.0
Spends Time with Me 5.0

Specialties & Research

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

  • He has special expertise in 6 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Colonoscopy
  • Constipation
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Ulcerative Colitis

Education & Awards

Dr. Marshall graduated from University of Missouri at Columbia.


Dr. Marshall has 7 hospital affiliations:

  • University of Missouri Hospital & Clinic 
  • Columbia Regional Hospital 

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Additional Information
Dr. John Bryson Marshall MD is a male Internist, has 34 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. John B. Marshall practice?
Dr. John Marshall has 3 office locations.
Dr. John Marshall practices Internal Medicine and Gastroenterology near Columbia, MO.
Additional practice locations include: Hillsborough, NC.
See Columbia Internists and Columbia Gastroenterologists.