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You May Experience a Little Extra Wait Time

We’ve recently updated our electronic health record and other systems to better support your care. We appreciate your patience and understanding as we work through this change and look forward to caring for you!

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Information about Mercy Medical Center’s Transition to Baystate Health

Mercy Medical Center and its affiliated medical group practices joined Baystate Health on November 1, 2026.

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Gastroenterology Faculty

All our faculty members are academic gastroenterologists with appointments at UMass Chan Medical School-Baystate.

Their expertise spans the gamut of gastroenterology, including advanced endoscopy, transplant hepatology, inflammatory bowel disease, and gastrointestinal motility.

Although they have wide-ranging clinical expertise and academic interests, what our faculty all have in common is their collegiality and a passion for teaching. You will receive superior training.

Program Director

Yesenia Greeff, MD

Associate Program Directors

Jacob Alexander, MD, DM

Mohammed Absar Ullah, MD

Other Faculty

Varun Angajala, MD

Nha Duong, DO

Rony Ghaoui, MD

Jeeva Jaganathan, MD

Tiago Martins, DO

John Miller, MD

Tushaar Shrimanker, MD

Jorge Sotelo, MD

Kais Zakharia, MD

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