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Photo of Dr. Mark Donowitz

Mark Donowitz, M.D.

Mark Donowitz, M.D.
Director, Hopkins NIH/NIDDK Conte Core Center
Professor of Medicine


Appointment Phone


Main Location

The Johns Hopkins Hospital

Out-of-State & International Patients +
Out of State Patients

Call 410-464-6641 (8a.m. to 6p.m., EST, Mon-Fri)

Learn more about our out-of-state patient services »

International Patients

Call +1-410-502-7683 (7a.m. to 6p.m., EST, Mon-Fri)

Learn more about our international patient services »


  • Director, Hopkins NIH/NIDDK Conte Core Center
  • GI Division, Director of Basic Research
  • Professor of Medicine
  • Professor of Physiology

Centers & Institutes



The Johns Hopkins Hospital

Appointment Phone: 410-933-7495

600 N. Wolfe Street
Ross Research Building Suite 925
Baltimore, MD 21287 map
Phone: 410-955-9675
Fax: 410-955-9677


Clinical Gastroenterology, Diarrhea, Diarrheal Disease, Digestive Diseases, Gastroenterology, Short Bowel Syndrome

Research Interests

Intestinal Salt Absorption and the proteins involved including their regulation; Development of drug therapy for diarrheal disorders; Use of human enteroids to understand intestinal physiology and pathophysiology

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