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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. John Simpson:

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  1. Qualifications
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Specialties & Research

Dr. John Simpson, 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. Simpson graduated from Georgetown University, Washington.


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Additional Information
Dr. John Arthur Simpson MD is a male Internist and practices in Internal Medicine and Gastroenterology.
Where does Dr. John A. Simpson practice?
Dr. John Simpson has 1 office location.
Dr. John Simpson practices Internal Medicine and Gastroenterology near Henderson, NV.
See Henderson Internists and Henderson Gastroenterologists.