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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. Mark Korsten:

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Specialties & Research

Dr. Mark Korsten, MD is board certified in Gastroenterology.

  • He has special expertise in 13 areas:
  • Acid Reflux Disease (Gastroesophageal Reflux / GERD)
  • Colonic Polyps
  • Colonoscopy
  • Constipation
  • Esophageal Diseases
  • Esophageal Stenosis
  • Esophageal and Gastric Varices
  • Esophagoscopy
  • Gastrointestinal Motility Disorders
  • Hepatitis C
  • Irritable Bowel Syndrome (IBS)
  • Liver Diseases
  • Ulcerative Colitis

Education & Awards

Dr. Korsten graduated from Yale University, New Haven. He has 2 awards.

Castle Connolly America's Top Doctors® (2004 - 2008, 2010 - 2015)
Castle Connolly Top Doctors: New York Metro Area™ (2001 - 2008, 2010 - 2015)


Dr. Korsten has 3 hospital affiliations:

  • Mt Sinai Hospital 
  • VA Medical Center - Bronx 
  • Bronx Veterans Affairs Medical Center 


  • French

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Additional Information
Dr. Mark Allen Korsten MD is a male Internist, has 41 years of experience and practices in Gastroenterology.
Where does Dr. Mark A. Korsten practice?
Dr. Mark Korsten has 1 office location.
Dr. Mark Korsten practices Gastroenterology near Bronx, NY.
See Bronx Gastroenterologists.