Mark Christopher Mattar, MD| Gastroenterology | MedStar Health
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Mark Christopher Mattar

Mark Christopher Mattar, MD
Provider is directly employed by MedStar Health

4.5 out of 5 (411 reviews)

Specialties: Gastroenterology

Languages: Arabic, English, Spanish

877-303-1462

About me

Dr. Mattar is the director of the IBD Center, with expertise in diagnosing and treating inflammatory bowel diseases (IBD), Crohn's disease, colitis, and celiac disease. Dr. Mattar has a particular interest in IBD therapeutics, disease monitoring, and colorectal cancer prevention. He is active in clinical research and medical education for trainees, the community, and patients. He is certified in intestinal ultrasound (IUS), which he applies to advancing IBD patient care and research. Dr. Mattar directs the IUS program at MedStar Health, which is the only center in the Mid-Atlantic outside of New York that serves as a certified training site.

Dr. Mattar sees patients in his gastroenterology practice in the IBD Center at MedStar Georgetown University Hospital. He embraces a collaborative approach to patient care as part of a multidisciplinary treatment team that includes dietitians and other key providers. To learn more about IBD, click here. He is also active in clinical trials for IBD therapies.

Dr. Mattar teaches at MedStar Georgetown University Hospital as Professor of Medicine, and is the director of the Fellowship Training Program in Gastroenterology. He is also an active member of the Crohn's and Colitis Foundation D.C. Metro chapter mission committee, the Professional Education National Scientific Advisory Committee and the Northeast Regional MyIBD Learning Planning Committee.

As the Quality Improvement Officer for the Division of Gastroenterology, Dr. Mattar has been 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.

The mission of the training program he directs states, "To create an environment where compassionate medical trainees can learn to provide exceptional quality care to the patients we serve." He prides himself in treated his patients as he would his own family.

Clinical areas of focus

  • Crohn's Disease
  • Inflammatory Bowel Disease
  • Ulcerative Colitis
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Conditions and procedures

Conditions I treat

  • Anal Fissures
  • Celiac Disease
  • Colitis
  • Colon Stricture
  • Crohn's Disease
  • Inflammatory Bowel Disease
  • Inflammatory Bowel Disease (IBD) With Infection
  • Microscopic Colitis
  • Proctitis
  • Ulcerative Colitis
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Procedures I perform

  • Bedside Intestinal Ultrasound For Inflammatory Bowel Disease
  • Colonoscopy
  • Colonoscopy With Biopsy
  • Colonoscopy With Chromoendoscopy
  • Colonoscopy With Dilation
  • EGD With Biopsy
  • Esophagogastroduodenoscopy With Biopsy
  • Pouchoscopy
  • Sigmoidoscopy With Biopsy
  • Small Intestinal Endoscopy With Biopsy
  • Upper Gi Endoscopy
  • Upper Gi Endoscopy With Biopsy
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Practice locations

Distance from Change Location Enter your Location

3800 Reservoir Rd NW
Main Bldg 2nd Fl
Washington, DC, 20007

202-444-8541
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miles away

Fax 877-303-1462

Insurance

This list represents the major payors accepted by MedStar Health.

NOTE: Payor contracts change and not all plans associated with a payor may be covered. Payors may offer multiple plans. If you have a question related to your insurance, please contact your insurance plan directly. Contact information is located on your health insurance ID card.

*Denotes limited participation. Specific providers and practices may NOT be participating. Please contact your insurance plan directly.

  • List of insurance plans we accept
    • Aetna
    • CareFirst BlueCross BlueShield of Maryland
    • Cigna Health Care
    • Kaiser Permanente*
    • MedStar Select (Administered by CareFirst)
    • United HealthCare
    • Aetna
    • CareFirst BlueCross BlueShield of Maryland
    • Healthspring
    • Humana
    • Medicare & Railroad Medicare
    • United HealthCare
    • Aetna Better Health of Maryland *
    • Medical Assistance/Medicaid
    • MedStar Family Choice MD
    • Priority Partners *
    • United HealthCare Community Health Plan MD
    • Wellpoint MD
    • AmeriHealth Caritas
    • Health Services For Children With Special Needs (HSCSN)
    • Medical Assistance/Medicaid
    • MedStar Family Choice DC
    • Johns Hopkins Employer Health Programs *
    • Johns Hopkins US Family Health Plan *
    • MultiPlan
    • Private Healthcare Systems
    • Tricare/Humana Military
    • VA Community Care Network (VACCN)

Videos

Education

Board Certification: American Board of Internal Medicine, Gastroenterology

Fellowship: Georgetown University School of Medicine GME (2010)

Residency: UCLA-Olive View Medical Center-GME (2007)

Medical School: Virginia Commonwealth University Medical School (2004)

Awards

  • Fellow of the Crohn’s & Colitis Foundation (FCCF), 2024
    Northern Virginia Top Doctor, 2021
    Washingtonian Top Doctor Award since 2021
    Fellow, American Gastroenterology Association, 2020
    Fellow, American College of Gastroenterology, 2018
    Gastroenterology Fellows Award for Excellence in Teaching, 2015
    American Gastroenterological Association's Bridges to Excellence Program, 2014
    Commitment to Patient Care, VA Medical Center, 2012

Ratings and reviews

  • Explanations the care provider gave you about your problem or condition

    4.5
  • Extent to which the care provider listened to you

    4.5
  • Care provider’s discussion of any proposed treatment (options, risks, benefits, etc.)

    4.4
  • Provider included you in decisions

    4.4
  • Concern the care provider showed for your questions or worries

    4.6
  • Likelihood of recommending this care provider to others

    4.4
  • Jan 10, 2026

    Excellent

  • Jun 25, 2025

    My concerns and questions were addressed and I felt like I was listened to, not talked over. Would highly recommend.

  • Apr 27, 2025

    Excellent first meeting making me feel listened to and in very good hands for my upcoming coming procedure.