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Dr. Ocallahan is on Doximity

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Education & Training

  • UMass Chan Medical School
    UMass Chan Medical SchoolFellowship, Gastroenterology, 1996 - 1999
  • Tufts Medical Center
    Tufts Medical CenterResidency, Internal Medicine, 1993 - 1996
  • University of Massachusetts Medical School
    University of Massachusetts Medical SchoolClass of 1993

Certifications & Licensure

  • MA State Medical License
    MA State Medical License 1999 - 2025
  • American Board of Internal Medicine Gastroenterology

Hospital Affiliations