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
- Microscopic Colitis
- Ulcerative Colitis
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
- Colonic Polyps
- Colorectal Malignancy
- Crohn's Disease
- Diarrhea
- Dysphagia
- Epigastric Pain
- Family History Of Colon Cancer
- Gastroenteritis
- Gastroesophageal Reflux Disease
- Hemorrhoids
- 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
Procedures I perform
- Biologic Therapy For Gastrointestinal Diseases
- Colon Polypectomy
- Colonoscopy
- Colorectal Screening
- 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.
-
List of insurance plans we accept
- United Healthcare Navigate
- United Healthcare Core Essential (HMO)
- 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
- Optimum Choice
- Innovation Health: Indemnity
- United Healthcare Choice
- HealthyBlue PPO
- Blue Choice Advantage & Healthy Blue (HMO, POS)
- 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
- United Healthcare Compass (HMO)
- Aetna HMO
- Open EPO Plus
- Aetna Elect Choice/ Open Access (POS)
- Network OA
- Open HMO
- OneNet PPO, Inc.
- United Healthcare Options (PPO) (includes Empire PPO, GEHA, Compass Rose)
- Private Health Care Systems (PHCS) (PPO)
- First Health PPO
- Aetna Elect Choice/ EPO (Aetna Health Fund) Innovation Health: Network Only Plus
- CFBCBS (NCA) Indemnity
- CFBCBS Federal Employee Program (Std. & Basic PPO)
- Coventry Health Care of Virginia
- United Healthcare Select HMO - EPO/NPP
- M.D. IPA (HMO)
- United Student Resources
- CIGNA Indemnity
- Aetna USAccess (POS)
- CIGNA POS/Network POS
- Tricare Standard
- 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
- MedStar Medicare Choice
- Mamsi Life & Health (Indem./PPO)
- Tricare Extra (Indemnity)
- Optimum Choice Preferred (POS) & OCI Direct (HMO)
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 Postprandial Abdominal 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
- Postvaccination Symptoms After a Third Dose of mRNA SARS-CoV-2 Vaccination in Patients With Inflammatory Bowel Disease: Results From CORALE-IBD
- Check this out: treatment paradigms in immune-checkpoint inhibitor colitis