Dr. Mark C. Mattar, MD

Dr. Mark C. Mattar, MD

Dr. Mark C. Mattar, MD

Languages: English, Arabic, Spanish
Fax: (877) 303-1462

Contact this Provider:

  • Gastroenterology
Conditions I Treat
  • abdominal pain
  • anal fissure
  • anal fistula
  • anal pain
  • blood in stool
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Procedures I Perform
  • biologic therapy for gastrointestinal diseases
  • colon polypectomy
  • colonoscopy
  • early detection of cancer
  • endoscopic mucosal resection of large colon polyps
  • Show All
About the Provider

Dr. Mattar is the Quality Improvement Officer for the Division of Gastroenterology.

As the director of the IBD Center he has expertise in diagnosing and treating inflammatory bowel disease (IBD)Crohn's disease, colitis, and celiac disease.  Dr. Mattar has a particular interest in IBD therapeutics and IBD and colorectal cancer prevention. He is active in clinical research and medical education for trainees, the community, and patients.
Dr. Mattar sees patients in his gastroenterology practice at MedStar Georgetown University Hospital.  He embraces a holistic approach to patient care within the IBD Center at MedStar Georgetown as part of a multidisciplinary treatment team that includes dietitians and other key providers. He is also active in clinical trials for IBD and performs fecal microbiota transplantation for recurrent and refractory C. difficile infection.

Dr. Mattar teaches at MedStar Georgetown University Hospital as Associate Professor of Medicine, and is the Director of the Fellowship Training Program in Gastroenterology.  He is also an active member of the mission committee of the Crohn's and Colitis Foundation, D.C. Metro chapter; the ACG Training Committee and the Patient Education National Scientific Advisory Committee for the Crohn’s and Colitis Foundation. In 2014, Dr. Mattar was recognized by the American Gastroenterological Association's Bridges to Excellence Program for his commitment to providing comprehensive quality care for patients with IBD.

Dr. Mattar enjoys family time with his wife and son, including fishing in local ponds and creeks. He especially enjoys exploring the Washington museums and playgrounds with his young son. He also enjoys checking out the local cafes and creating his own latte art. 

Patients and practitioners can connect with Dr. Mattar on Twitter (@gastrodocmattar) and follow his tweets on new developments in gastroenterology.

  • Fellowship Program: MedStar Georgetown University Hospital (2010)
  • Internship Program: Olive View - UCLA Medical Center (2007)
  • Medical School: Virginia Commonwealth University School of Medicine (2004)
  • Board Certification: American Board of Internal Medicine, Gastroenterology

Practice Locations
  • 3800 Reservoir Road Northwest
    Main Building 2nd Floor
    Washington, DC 20007
    View Map

    Phone: (202) 444-8541
    Fax: (877) 303-1462

Member of Medical Staff
  • MedStar Georgetown University Hospital