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Andrew Duffy, MD, FACS, FASMBS

Gastrointestinal Surgery, Minimally Invasive Surgery, Bariatric Surgery
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Patient type treated
Child, Adult
Accepting new patients
Referral required
From patients or physicians
Board Certified in
General Surgery


Andrew Duffy, MD, is a board certified general surgeon and is fellowship-trained in minimal access surgery. He is associate surgical chief of the Digestive Health Service Line for Yale New Haven Health System (YNHHS) and director of the YNHHS Hernia Program. 

His goal is to offer the most effective surgery with the least recovery time and post-operative discomfort.

Dr. Duffy is dedicated to helping individuals with acute and chronic issues with their stomach, intestines, colon, gallbladder, or other abdominal organs. He specializes in all type of primary and recurrent abdominal wall and hiatal hernias. He has extensive experience at surgically treating colon cancer and diverticulitis using laparoscopic techniques.

He also specializes in laparoscopic procedures for obesity, including gastric bypass, sleeve gastrectomy, adjustable gastric banding and revision of prior bariatric surgery.

He specializes in laparoscopic gastrointestinal surgery; laparoscopic colon surgery for colon cancer or diverticulitis; laparoscopic bariatric surgery for morbid obesity; laparoscopic gastric bypass surgery; laparoscopic adjustable gastric banding; laparoscopic sleeve gastrectomy; revisional bariatric surgery; laparoscopic surgery for reflux and achalasia; laparoscopic Nissen, laparoscopic Heller myotomy; laparoscopic splenectomy; laparoscopic paraesophageal hernia repair; laparoscopic repair of abdominal-wall hernias; laparoscopic repair of inguinal hernias; gall bladder; gall stones; cholecystectomy; gall stone pancreatitis; Gastroesophageal Reflux Disease (GERD); Inflammatory Bowel Disease (IBD); Crohn's disease; ulcerative colitis; appendicitis; gastroparesis.


  • Associate Professor of Surgery (Gastrointestinal)
  • Associate Surgical Chief, Digestive Health
  • Medical Director, Yale New Haven Health System Hernia Program

Education & Training

  • Clinical Fellow
    Weill Medical College of Cornell University (2004)
  • Chief Resident
    University of Massachusetts Medical School (2003)
  • Resident
    University of Massachusetts Medical School (2002)
  • MD
    University of Massachusetts Medical School (1996)
  • BS
    Boston College (1992)

Additional Information

  • Yale Bariatric & Minimally Invasive Surgery
    Yale Medicine Multispecialty
    800 Boston Post Road, Wing Building 3 Fl 2nd
    Guilford, CT, 06437