About Mark P. Epstein, MD

Dr. Mark Epstein has more than 30 years in medical training and experience. He is board certified in Gastroenterology. He earned his medical degree from University of Witwatersrand Medical School in South Africa. Internal Medicine Residency, Gastroenterology fellowship at Tufts Medical Center. Previous faculty Tufts Medical Center. Service Chief of Gastroenterology at Emerson Hospital in Concord, MA. He is currently the president elect for Emerson Hospital Medical Staff and past chief of Gastroenterology at Emerson Hospital.  Most notably, he was recognized as one of Boston Magazine’s “Top Doctors” in both 2020 and 2021.

Conditions & Procedures

  • Abdominal Pain
  • Acid Reflux & GERD
  • Celiac Disease
  • Colon Cancer Screening
  • Colon Diseases & Polyps
  • Crohn’s & Ulcerative Colitis
  • Hemorrhoids
  • Inflammatory Bowel Disease
  • Irritable Bowel Syndrome
  • Colonoscopy (Screening & Diagnostic)
  • EGD (Upper Endoscopy)
  • Flexible Sigmoidoscopy

Office Locations

Primary Location

Picture of the Acton Office


45B Discovery Way
Acton, MA 01720

Phone: 978-429-2010
Fax: 978-264-1936

Procedure Locations

Having a procedure? It may not always be in the same location where you consulted with your doctor. Check with your doctor to make sure you’re headed to the right place.



University of the Witwatersrand Medical School


Tufts-New England Medical Center


Tufts-New England Medical Center


Tufts-New England Medical Center

Professional Highlights

Awards & Recognitions

Boston Magazine, Top Doctor