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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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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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Michelle Lillian Ma, M.D.
Expertise: Acute Viral Hepatitis, Alcoholic Liver Disease, Alpha 1 Antitrypsin (AAT) Deficiency, Ascites, Autoimmune Hepatitis
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Saowanee Ngamruengphong, M.D.
Expertise: Barrett's Esophagus, Bile Duct Disease, Burping Belching, Chest Pain, Cholangiocarcinoma
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Sun Jung Oh, M.D.
Expertise: Esophageal Diseases, Gastroenterology, General Gastroenterology, Motility Disorders
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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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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 Bayview Medical Center 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
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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

Centers and Clinics at Bayview Medical Center
- Inflammatory bowel disease (Crohn’s disease and ulcerative colitis)
- Hepatology, including pre-liver transplant evaluation
- Motility (gastroparesis, achalasia, chronic constipation)
- General gastroenterology (heartburn, diarrhea, constipation, blood in the stool)
- Colon cancer screening
Procedures at Johns Hopkins Bayview
- 24-Hour pH impedance test
- Anorectal manometry
- Esophageal manometry
- Capsule endoscopy
- Colonoscopy (screening and treatment)
- Endoscopic ultrasound (EUS) with fine needle aspiration
- Endoscopic retrograde cholangiopancreatography (ERCP)
- Endoscopic mucosal resection (EMR)
- Endoscopic submucosal dissection (ESD)
- Motility studies
- Sigmoidoscopy
- 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
Carolyn S. Bacal, M.P.H., P.A-C.
Certified Physician Assistant

Valerie Owen, M.S.N., C.R.N.P.
Advanced Gastroenterology Nurse Practitioner

Monica Riegert, D.N.P., C.R.N.P.
Advanced Gastroenterology Nurse Practitioner

Blake Reddick, DNP, CRNP
General Gastroenterology Nurse Practitioner
