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

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

4.5 out of 5 (377 reviews)

Specialties: Gastroenterology

Languages: Spanish, Arabic, English

877-303-1462

202-444-8541

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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 ultasound (IUS), which he applies to advancing IBD patient care and research.
 
Dr. Mattar sees patients in his gastroenterology practice at MedStar Georgetown University Hospital. He embraces a team 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 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

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

Conditions I treat

  • Abdominal Bloating
  • Abdominal Pain
  • Altered Bowel Habits
  • Anal Fissure
  • Anal Fistula
  • Anemia
  • Blood In Stool
  • Bright Red Blood Per Rectum
  • Celiac Disease
  • Clostridium Difficile
  • Colitis
  • Collagenous Colitis
  • Colon Stricture
  • Colorectal Malignancy
  • Crohn's Disease
  • Diarrhea
  • Dysphagia
  • Epigastric Pain
  • Family History Of Colon Cancer
  • Gastroenteritis
  • Ileitis
  • Inflammatory Bowel Disease
  • Iron Deficiency Anemia
  • Ischemic Colitis
  • Lymphocytic Colitis
  • Melena
  • Microscopic Colitis
  • Nausea
  • Proctitis
  • Rectal Bleeding
  • Rectal Cancer
  • Rectal Pain
  • Small Bowel Stricture
  • Stomach Cramps
  • Swallowing Problem
  • Ulceration Of Intestine
  • Ulcerative Colitis
  • Ulcerative Proctitis
  • Vomiting
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Procedures I perform

  • Biologic Therapy For Gastrointestinal Diseases
  • Colon Polypectomy
  • Colonoscopy
  • Colorectal Screening
  • Early Detection Of Cancer
  • Endoscopic Mucosal Resection Of Large Colon Polyps
  • Endoscopy
  • Esophagogastroduodenoscopy (EGD)
  • Fecal Transplant
  • Gastrointestinal (GI) Cancer Screening
  • Ileoscopy
  • Proctosigmoidoscopy
  • Sigmoidoscopy
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Practice locations

Distance from Change LocationEnter your Location

3800 Reservoir Road Northwest
Building 2
Washington, DC, 20007

202-444-8541

Fax 877-303-1462

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miles away

Fax 877-303-1462

Insurance

MedStar Health accepts most major health insurance plans. If you are uncertain as to whether your individual health insurance plan is accepted at MedStar Health, please call your insurance company.

  • List of insurance plans we accept
    • UnitedHealthcare Medicare Adv/Special Needs Plans
    • Medicare Fee for Service
    • Kaiser Permanente Signature-Added Choice
    • United Healthcare Options (PPO) (includes Empire PPO, GEHA, Compass Rose)"
    • Kaiser MD Medicaid MCO
    • Kaiser Permanente Select
    • CFBCBS Federal Employee Program (Std/Basic PPO/Blue Focus)
    • Kaiser PermanenteSelect-Added Choice
    • Aetna Better Health of Maryland
    • Kaiser Permanente Signature
    • Blue Choice Advantage & Healthy Blue (HMO, POS)"
    • UHC Community Plan of MD
    • UnitedHealthcare and AARP Medicare Complete Plans/ UHC Group Medicare Advantage Plans HMO, POS, PPO"
    • Private Health Care Systems (PHCS) (PPO)
    • CFBCBS EPO
    • Kaiser Virginia Premier
    • Kaiser Permanente Medicare Plus (Medicare Supplemental Plan)
    • Kaiser Permanente Flexible Choice POS
    • Cigna HealthSpring Medicare Advantage
    • POS OA & OA Plus
    • Aetna Innovations: HMO & EPO Plus
    • Choice Fund PPO
    • CIGNA HMO Open Access (OA)
    • CFBCBS Blue Choice Opt Out Open Access
    • Select HMO/HealthFund/Health Network
    • Innovation Health: Open Network Only Plus
    • Innovation Health: Indemnity
    • United Healthcare Choice
    • HealthyBlue PPO
    • Aetna Traditional Choice (PPO)
    • Aetna Managed Choice (POS)
    • Open POS II
    • Aetna Open Choice (PPO)
    • Choice POS & Choice POS II
    • Aetna Managed Choice Open Access (POS)
    • Opoen HMO Option
    • Innovation Health: POS
    • Innovation Health: Open POS Plus
    • PPO and PPO Plus
    • Cigna EPO
    • Aetna HMO-Open Access/Select OA/HealthFund/Health Network Option OA
    • BlueChoice Open Access
    • Innovation Health: PPO
    • CFBSBC Blue Preferred PPO
    • Innovation Health: POS Plus
    • Aetna HMO
    • Open EPO Plus
    • Aetna Elect Choice/ Open Access (POS)
    • Network OA
    • Open HMO
    • First Health PPO
    • Aetna Elect Choice/ EPO (Aetna Health Fund) Innovation Health: Network Only Plus
    • CFBCBS (NCA) Indemnity
    • Coventry Health Care of Virginia
    • United Healthcare Select HMO - EPO/NPP
    • M.D. IPA (HMO)
    • United Student Resources
    • CIGNA Indemnity
    • CIGNA POS/Network POS
    • Tricare Prime
    • Aetna Quality Point of Service (POS)
    • Aetna Student Health Insurance
    • Great-West Healthcare POS/CIGNA
    • Coventry of Delaware HMO/PPO
    • Tricare for Life (Medicare Supplemental Plan)
    • CIGNA HMO & Network (HMO)
    • Aetna Medicare Advantage HMO & PPO Plans
    • United Healthcare Select Plus (POS)
    • CFBCBS BlueChoice HMO
    • CFBCBS Maryland Indemnity or PPO
    • CFBCBS Maryland Point of Service Plan (MPOS)
    • M.D. IPA Preferred (POS)
    • CFBCBS Blue Choice Opt Out Plus Open Access (POS)
    • MedStar Select (MedStar Associates' Plan)
    • Aetna Worker's Compensation Network
    • FIRST HEALTH
    • United Healthcare Choice Plus
    • Coventry Health Care National Network PPO
    • MedStar Family Choice - Maryland Health Choice
    • Mamsi Life & Health (Indem./PPO)
    • Optimum Choice Preferred (POS) & OCI Direct (HMO)

Videos

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Education

Board Certification: American Board of Internal Medicine, Gastroenterology

Fellowship Program: MedStar Georgetown University Hospital (2010)

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

Medical School: Virginia Commonwealth University (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

Hospital affiliations

MedStar Washington Hospital Center

MedStar Georgetown University Hospital

News and publications

  1. Triage of Patient Phone Calls in Inflammatory Bowel Disease Clinic: Decreasing the Administrative Burden and Improving the Patient Experience

  2. Tofacitinib for the treatment of ulcerative colitis: A review of the literature

  3. Gastric Adenocarcinoma at the Sites of Gastric Sarcoidosis: A Case Report

  4. Improving Immunization Strategies in Patients with Inflammatory Bowel Disease 

  5. Role of colonoscopy in diagnosis of capecitabine associated ileitis: Two case reports

  6. Safety and efficacy of fecal microbiota transplant in 9 critically ill patients with severe and complicated Clostridium difficile infection with impending colectomy 

  7. Immune checkpoint inhibitor-induced colitis: A comprehensive review

  8. Monitoring inflammatory bowel disease during pregnancy: Current literature and future challenges

  9. Post-endoscopic procedure satisfaction scores: Can we improve?

  10. Fecal Microbiota Transplantation in RecurrentClostridium Difficile Infections: Our Experience inPatients with and without Inflammatory Bowel Disease

  11. Ipilimumab associated colitis: an IpiColitis case series at MedStar Georgetown University Hospital

  12. Diagnosis and management of common gastrointestinal tract infectious diseases in ulcerative colitis and Crohn's disease patients

  13. Inflammatory bowel disease (IBD) activity and depression

  14. Median Arcuate Ligament Syndrome: A Cause of Postprandial Abdominal Pain in a Patient With Ulcerative Colitis

  15. Current Management of Inflammatory Bowel Disease and Colorectal Cancer

  16. Clinicopathologic significance of synchronous and metachronous adenomas in colorectal cancer

  17. Induction of Remission in Moderate-to-Severe Steroid Refractory Ulcerative Colitis Using Patient-Driven Non-Pharmacologic Therapy

  18. Higher than anticipated Health Literacy in Patients with Inflammatory Bowel Disease: A Single Center Experience

  19. Long-Term Safety and Efficacy of Fecal Microbiota Transplantation in the Treatment of Clostridium difficile Infection in Patients With and Without Inflammatory Bowel Disease: A Tertiary Care Center’s Experience 

  20. Oral Vancomycin Induces and Maintains Remission of Ulcerative Colitis in the Subset of Patients With Associated Primary Sclerosing Cholangitis 

  21. Fecal Microbiota Transplant is Highly Effective in Real-World Practice: Initial Results from the FMT National Registry

  22. Artificial intelligence in inflammatory bowel disease endoscopy: current landscape and the road ahead

  23. Decreased Antibody Responses to Ad26.COV2.S Relative to SARS-CoV-2 mRNA Vaccines in Patients with Inflammatory Bowel Disease

  24. Gastrointestinal hemorrhage in the setting of gastrointestinal cancer: Anatomical prevalence, predictors, and interventions

  25. Health Economic Impact of a Multicenter Quality-of-Care Initiative for Reducing Unplanned Healthcare Utilization Among Patients With Inflammatory Bowel Disease

  26. Quality of Care Program Reduces Unplanned Health Care Utilization in Patients With Inflammatory Bowel Disease

  27. Integrating Cognitive Apprenticeship Into Gastroenterology Clinical Training

  28. Postvaccination Symptoms After a Third Dose of mRNA SARS-CoV-2 Vaccination in Patients With Inflammatory Bowel Disease: Results From CORALE-IBD

  29. Check this out: treatment paradigms in immune-checkpoint inhibitor colitis

  30. Concordance and Discordance Between Patient-reported Remission, Patient-reported Outcomes, and Physician Global Assessment

  31. Evaluation of online chat-based artificial intelligence responses about inflammatory bowel disease and diet

  32. Communicating Information Regarding IBD Remission to Patients: Evidence From a Survey of Adult Patients in the United States 

  33. Independent predictors of 90-day readmission in patients with inflammatory bowel disease: a nationwide retrospective study

  34. Treat-to-target of endoscopic remission in patients with inflammatory bowel disease in symptomatic remission on advanced therapies (QUOTIENT): rationale, design and protocol for an open-label, multicentre, pragmatic, randomised controlled trial

  35. Does Clostridioides difficile infection play a role in premalignant colonic lesions? A retrospective cohort study

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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

  • Apr 27, 2025

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

  • Mar 28, 2025

    An excellent appt!

  • Nov 20, 2024

    Dr. Mattar is great. Very efficient and too the point but answers all questions thoroughly and with care. He is a great doc, just wish I could get in to see him more frequently as a routine Crohn's patient.

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