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 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 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 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 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
- Irritable Bowel Syndrome
- Microscopic Colitis
- Rectal Bleeding
- Ulcerative Colitis
Conditions and procedures
Conditions I treat
- Anal Cancer
- Anal Fissure
- Anal Fistula
- Bright Red Blood Per Rectum
- Celiac Disease
- Clostridium Difficile
- Colitis
- Collagenous Colitis
- Colon Stricture
- Colonic Polyps
- Colorectal Malignancy
- Crohn's Disease
- Diarrhea
- Gastroenteritis
- Gastrointestinal (GI) Cancer
- Ileitis
- Inflammatory Bowel Disease
- Iron Deficiency Anemia
- Irritable Bowel Syndrome
- Ischemic Colitis
- Lymphocytic Colitis
- Microscopic Colitis
- Proctitis
- Rectal Bleeding
- Rectal Cancer
- Rectal Pain
- Small Bowel Stricture
- Ulceration Of Intestine
- Ulcerative Colitis
- Ulcerative Proctitis
Procedures I perform
- Biologic Therapy For Gastrointestinal Diseases
- Colon Polypectomy
- Colonoscopy
- Early Detection Of Cancer
- Endoscopic Mucosal Resection Of Large Colon Polyps
- Esophagogastroduodenoscopy (EGD)
- Fecal Transplant
- Gastrointestinal (GI) Cancer Screening
- Ileoscopy
- Proctosigmoidoscopy
- Sigmoidoscopy
Insurance
MedStar Medical Group accepts most major health insurance plans. If you are uncertain as to whether your individual health insurance plan is accepted at MedStar Medical Group, please call your insurance company.
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List of insurance plans we accept
- Aetna Elect Choice/ EPO (Aetna Health Fund) Innovation Health: Network Only Plus
- Aetna Quality Point of Service (POS)
- Aetna USAccess (POS)
- Aetna Student Health Insurance
- Aetna Medicare Advantage HMO & PPO Plans
- CFBCBS BlueChoice HMO
- CFBCBS Blue Choice Opt Out Plus Open Access (POS)
- CFBCBS Maryland Point of Service Plan (MPOS)
- CFBCBS Federal Employee Program (Std. & Basic PPO)
- CFBCBS Maryland Indemnity or PPO
- CFBCBS (NCA) Indemnity
- CIGNA HMO & Network (HMO)
- CIGNA POS/Network POS
- Great-West Healthcare POS/CIGNA
- CIGNA Indemnity
- Coventry Health Care of Virginia
- Coventry of Delaware HMO/PPO
- First Health PPO
- FIRST HEALTH
- Tricare Prime
- Tricare Standard
- Tricare Extra (Indemnity)
- Tricare for Life (Medicare Supplemental Plan)
- MedStar Family Choice - Maryland Health Choice
- MedStar Select (MedStar Associates' Plan)
- MedStar Medicare Choice
- United Healthcare Select HMO - EPO/NPP
- United Healthcare Select Plus (POS)
- United Healthcare Choice Plus
- United Student Resources
- M.D. IPA (HMO)
- M.D. IPA Preferred (POS)
- Optimum Choice Preferred (POS) & OCI Direct (HMO)
- Mamsi Life & Health (Indem./PPO)
- Aetna Worker's Compensation Network
- Coventry Health Care National Network PPO
- Private Health Care Systems (PHCS) (PPO)
- United Healthcare Options (PPO) (includes Empire PPO, GEHA, Compass Rose)
- OneNet PPO, Inc.
- United Healthcare Choice
- United Healthcare Core Essential (HMO)
- Optimum Choice
- United Healthcare Navigate
- United Healthcare Compass (HMO)
- CIGNA HMO Open Access (OA)
- Network OA
- POS OA & OA Plus
- CIGNA EPO
- PPO and PPO Plus
- Choice Fund PPO
- CFBSBC Blue Preferred PPO
- HealthyBlue PPO
- CFBCBS Blue Choice Opt Out Open Access
- BlueChoice Open Access
- Blue Choice Advantage & Healthy Blue (HMO, POS)
- Aetna Traditional Choice (PPO)
- Innovation Health: Indemnity
- Aetna Open Choice (PPO)
- Innovation Health: PPO
- Aetna Managed Choice (POS)
- Innovation Health: POS Plus
- Aetna Elect Choice/ Open Access (POS)
- Innovation Health: Open Network Only Plus
- Aetna HMO-Open Access/Select OA/HealthFund/Health Network Option OA
- Innovation Health: POS
- Open HMO
- Opoen HMO Option
- Open EPO Plus
- Aetna Managed Choice Open Access (POS)
- Choice POS & Choice POS II
- Innovation Health: Open POS Plus
- Open POS II
- Aetna HMO
- Select HMO/HealthFund/Health Network
- Aetna Innovations: HMO & EPO Plus
Videos
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
- Northern Virginia Top Doctor, 2021
- Washingtonian Top Doctor Award, 2021
- Washingtonian Top Doctor Award, 2020
- 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
News and publications
- Triage of Patient Phone Calls in Inflammatory Bowel Disease Clinic: Decreasing the Administrative Burden and Improving the Patient Experience
- Tofacitinib for the treatment of ulcerative colitis: A review of the literature
- Gastric Adenocarcinoma at the Sites of Gastric Sarcoidosis: A Case Report
- Improving Immunization Strategies in Patients with Inflammatory Bowel Disease
- Role of colonoscopy in diagnosis of capecitabine associated ileitis: Two case reports
- Safety and efficacy of fecal microbiota transplant in 9 critically ill patients with severe and complicated Clostridium difficile infection with impending colectomy
- Immune checkpoint inhibitor-induced colitis: A comprehensive review
- Monitoring inflammatory bowel disease during pregnancy: Current literature and future challenges
- Post-endoscopic procedure satisfaction scores: Can we improve?
- Fecal Microbiota Transplantation in RecurrentClostridium Difficile Infections: Our Experience inPatients with and without Inflammatory Bowel Disease
- Ipilimumab associated colitis: an IpiColitis case series at MedStar Georgetown University Hospital
- Diagnosis and management of common gastrointestinal tract infectious diseases in ulcerative colitis and Crohn's disease patients
- Inflammatory bowel disease (IBD) activity and depression
- Median Arcuate Ligament Syndrome: A Cause of PostprandialAbdominal Pain in a Patient With Ulcerative Colitis
- Current Management of Inflammatory Bowel Disease and Colorectal Cancer
- Clinicopathologic significance of synchronous and metachronous adenomas in colorectal cancer
- Induction of Remission in Moderate-to-Severe Steroid Refractory Ulcerative Colitis Using Patient-Driven Non-Pharmacologic Therapy
- Higher than anticipated Health Literacy in Patients with Inflammatory Bowel Disease: A Single Center Experience
- 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
- Oral Vancomycin Induces and Maintains Remission of Ulcerative Colitis in the Subset of Patients With Associated Primary Sclerosing Cholangitis
- Fecal Microbiota Transplant is Highly Effective in Real-World Practice: Initial Results from the FMT National Registry
- Artificial intelligence in inflammatory bowel disease endoscopy: current landscape and the road ahead
- Decreased Antibody Responses to Ad26.COV2.S Relative to SARS-CoV-2 mRNA Vaccines in Patients with Inflammatory Bowel Disease
- Gastrointestinal hemorrhage in the setting of gastrointestinal cancer: Anatomical prevalence, predictors, and interventions
- Health Economic Impact of a Multicenter Quality-of-Care Initiative for Reducing Unplanned Healthcare Utilization Among Patients With Inflammatory Bowel Disease
- Quality of Care Program Reduces Unplanned Health Care Utilization in Patients With Inflammatory Bowel Disease
Integrating Cognitive Apprenticeship Into Gastroenterology Clinical Training