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Maaza Sophia Abdi, M.D.
Expertise: Abdominal Pain, Anal Cancer, Celiac Disease, Clinical Gastroenterology, Colon Polyps
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Tsion Abdi, M.D., M.P.H.
Expertise: Barrett's Esophagus, Blood in Stool (Hematochezia), Colon Polyps, Colorectal Cancer Screening, Constipation
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Elham Afghani, M.D., M.P.H.
Expertise: Abdominal Pain, Colon Polyps, Colonoscopy, Colorectal Cancer Screening, Diarrhea
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Venkata Sandeep Akshintala, M.B.B.S.
Expertise: Abdominal Pain, Anal Fistula, Anemias, Barrett's Esophagus, Bile Duct Disease
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Kathy Patricia Bull-Henry, M.D., M.B.A.
Expertise: Celiac Disease, Clostridium Difficile, Diseases of the Small Bowel and Colon, Dysphagia, Eosinophilic Esophagitis
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Marcia Irene Canto, M.D., M.H.S.
Expertise: Barrett's Esophagus, Chest Pain, Digestive Disorders, Endoscopic Ultrasound, Endoscopy
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Victor Chen, M.D.
Expertise: Acute or Chronic Viral Hepatitis, Acute Viral Hepatitis, Alcoholic Liver Disease, Alpha 1 Antitrypsin (AAT) Deficiency, Ascites
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Reezwana Chowdhury, M.D.
Expertise: Anemias, Blood in Stool (Hematochezia), Clostridium Difficile, Colitis, Colon Cancer
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Mark Donowitz, M.D.
Expertise: Anal Fistula, Celiac Disease, Celiac Sprue, Clinical Gastroenterology, Clostridium Difficile
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Michael Gilbert Goggins, M.B.B.Ch., M.D.
Expertise: Abdominal Pain, Anemias, Barrett's Esophagus, Bloating, Blood in Stool (Hematochezia)
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Eduardo Jose Gonzalez-Velez, M.D.
Expertise: Abdominal Pain, Anemias, Barrett's Esophagus, Bloating, Blood in Stool (Hematochezia)
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Ekta Gupta, M.B.B.S.
Expertise: Abdominal Pain, Anemias, Barrett's Esophagus, Bloating, Blood in Stool (Hematochezia)
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Ahmet Omur Gurakar, M.D.
Expertise: Clinical Gastroenterology, Digestive Disorders, Elevated Liver Tests, End Stage Liver Disease, Fatty Liver
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James Peter Hamilton, M.D.
Expertise: Acute Viral Hepatitis, Alcoholic Liver Disease, Alpha 1 Antitrypsin (AAT) Deficiency, Ascites, Autoimmune Hepatitis
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Mouen A Khashab, M.D.
Expertise: Achalasia, Bile Duct Disease, Cholangiocarcinoma, Cholangioscopy, Colon Polyps
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Amy K. Kim, M.D.
Expertise: Acute Viral Hepatitis, Alcoholic Liver Disease, Alpha 1 Antitrypsin (AAT) Deficiency, Ascites, Autoimmune Hepatitis
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Mark Gregory Lazarev, M.D.
Expertise: Anal Fistula, Celiac Disease, Clinical Gastroenterology, Colitis, Colon Polyps
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Michelle Lillian Ma, M.D.
Expertise: Acute Viral Hepatitis, Alcoholic Liver Disease, Alpha 1 Antitrypsin (AAT) Deficiency, Ascites, Autoimmune Hepatitis
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Joanna Miller Peloquin Melia, M.D.
Expertise: Anal Fistula, Celiac Disease, Celiac Sprue, Colitis, Crohn's Disease
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Stephen Joseph Meltzer, M.D.
Expertise: Barrett's Esophagus, Esophageal Cancer, Gastroenterology, Gastroesophageal Reflux Disease (GERD)
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Saowanee Ngamruengphong, M.D.
Expertise: Barrett's Esophagus, Bile Duct Disease, Burping Belching, Chest Pain, Cholangiocarcinoma
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Anne Marie O'Broin Lennon, M.B.B.Ch., Ph.D.
Expertise: Endoscopic Ultrasound, Esophageal Cancer, Gastric Cancer, Gastroenterology, Pancreatic Cancer
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Alyssa Maria Parian, M.D.
Expertise: Crohn's Disease, Gastroenterology, Inflammatory Bowel Disease (IBD), Perianal Fistula, Ulcerative Colitis
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Florin Marian Selaru, M.D.
Expertise: Crohn's Disease, Fibrosis, Gastroenterology, Inflammatory Bowel Disease (IBD), Ulcerative Colitis
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Eun Ji Shin, M.D.
Expertise: Abdominal Pain, Barrett's Esophagus, Chest Pain, Clinical Gastroenterology, Colon Polyps
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Vikesh Singh, M.D., M.Sc.
Expertise: Abdominal Pain, Clinical Gastroenterology, Colon Polyps, Digestive Disorders, Endoscopic Ultrasound
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Alexandra Teresa Strauss, M.D.
Expertise: Alcoholic Liver Disease, Alpha 1 Antitrypsin (AAT) Deficiency, Ascites, Autoimmune Hepatitis, Bile Duct Disease
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Hazel Marie Galon Veloso, M.D.
Expertise: Abdominal Pain, Anemias, Barrett's Esophagus, Bloating, Blood in Stool (Hematochezia)
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Tinsay Ambachew Woreta, M.D., M.P.H.
Expertise: Acute or Chronic Viral Hepatitis, Acute Viral Hepatitis, Alcoholic Liver Disease, Alpha 1 Antitrypsin (AAT) Deficiency, Ascites
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Huimin Yu, B.M., M.D., Ph.D.
Expertise: Abdominal Pain, Anal Fistula, Anemias, Clinical Gastroenterology, Clostridium Difficile
Our expert clinicians at The Johns Hopkins Division of Gastroenterology and Hepatology at Johns Hopkins Hospital offer a full range of gastroenterology and hepatology services including endoscopy and motility studies.
Request an Appointment
Schedule online through MyChart
Available for follow-up appointments with most providers
Log into MyChart
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Schedule by phone
New and existing patients can schedule by phone using these numbers:
For care in Maryland: 410-933-7495
For care in DC: 202-660-5555
International patients: +1-410-502-7683 or fill out a form

Services at the Johns Hopkins Hospital
Clinics and Centers
- General gastroenterology (heartburn, diarrhea, constipation, blood in the stool, screening colonoscopy)
- Hepatology, including pre-liver transplant evaluation
- Inflammatory bowel disease (Crohn’s disease and Ulcerative colitis)
- Colon cancer screening
- Motility (gastroparesis, achalasia, chronic constipation)
- Heartburn
Procedures
- 24-Hour pH impedance test
- Anorectal manometry
- Esophageal manometry
- Capsule endoscopy
- Colonoscopy
- Endoscopic ultrasound (EUS) with fine needle aspiration
- Endoscopic retrograde cholangiopancreatography (ERCP)
- Endoscopic mucosal resection (EMR)
- Endoscopic submucosal dissection (ESD)
- Peroral Endoscopic Myotomy (POEM)
- Transoral incisionless fundoplication (TIF)
- Therapeutic endoscopy (biliary and pancreatic disorders, endoscopic management of large polyps)
- Upper Endoscopy or Esophagogastroduodenoscopy (EGD)
- Wireless esophageal pH test (Bravo test)
Our Team
Advanced Practice Providers
Monica Riegert, D.N.P., C.R.N.P.
Advanced Gastroenterology Nurse Practitioner
