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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. James Clark:

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Specialties & Research

Dr. James Clark, MD 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. Clark graduated from University of Illinois at Chicago.


Dr. Clark has 9 hospital affiliations:

  • Rush University Medical Center 
  • Advocate Good Samaritan Hospital 

> > > > Dr. James Clark, MD

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Additional Information
Dr. James Ralph Clark MD is a male Internist, has 22 years of experience and practices in Internal Medicine and Gastroenterology.
Where does Dr. James R. Clark practice?
Dr. James Clark has 1 office location.
Dr. James Clark practices Internal Medicine and Gastroenterology near Downers Grove, IL.
See Downers Grove Internists and Downers Grove Gastroenterologists.