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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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Infectious Disease Faculty

Program Director

Armando Paez, MD
Chief, Division of Infectious Disease
Associate Professor of Medicine, UMass Chan Medical School-Baystate

Associate Program Director

Durane Walker, MD
Residency Teaching Coordinator
Assistant Professor of Medicine, UMass Chan Medical School-Baystate

Other Faculty

Department of Medicine, Infectious Diseases Division

Daniel J. Skiest, MD, FACP, FIDSA
Director, Adult HIV/AIDS Program Vice Chair, Academic Affairs, Department of Medicine
Professor of Medicine, UMass Chan Medical School-Baystate

Sarah D. Haessler, MD, MS
Chair, Department of Medicine
Hospital Epidemiologist, Baystate Medical Center
Associate Professor of Medicine, UMass Chan Medical School-Baystate

Esteban Del Pilar-Morales, MD
Attending Physician, Infectious Disease Division
Assistant Professor of Medicine, UMass Chan Medical School-Baystate 

Sophia Hayward, CNP

Veronica Hull, CNP

Karen Hogan, PA-C
Inpatient Consult Service

Claire E. Magauran, MD
Attending Physician
Assistant Professor of Medicine, UMass Chan Medical School-Baystate

Urmee Saha, MD

Jennifer Schimmel, MD
Antimicrobial Stewardship Program
Assistant Professor of Medicine, UMass Chan Medical School-Baystate

Jacob Smith, MD, MPH
Associate Director, Hospital Epidemiology
Assistant Professor of Medicine, UMass Chan Medical School-Baystate

Department of Nursing

Ashley Fisher, RN

Mary Lee Bertrand, RN

Angelica Escobar, RN

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