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David N. Assis, MD

Gastroenterology, Hepatology
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Patient type treated
Child, Adult
Accepting new patients
Referral required
From patients or physicians
Board Certified in


David N. Assis, MD, is a hepatologist who treats patients with liver and digestive diseases at Yale Liver Clinics and Yale New Haven Hospital. He primarily focuses on autoimmune liver diseases (autoimmune hepatitis, primary sclerosing cholangitis, and primary biliary cholangitis) and is co-director of the Yale Autoimmune and Cholestatic Liver Diseases Program. He also has a clinical focus on liver and digestive complications of cystic fibrosis. To provide comfort to his patients, Dr. Assis tells them: “We will always support you and walk closely with you throughout your medical journey, and provide the most cutting-edge discoveries to offer the best possible care.”  

Dr. Assis became a hepatologist because he was fascinated by chronic liver diseases, and autoimmune liver diseases, in particular. An assistant professor of medicine (Digestive Diseases) at Yale School of Medicine (YSM), he dedicates his research to investigating the causes, mechanisms of disease, and novel treatments for these complex, rare disorders. In 2014, he was honored with YSM’s Kushlan Junior Faculty Award for his research work.  

Dr. Assis is a member of the American Association for the Study of Liver Diseases and current Chair of the Special Interest Group for Cholestatic and Autoimmune Liver Diseases. He is also a member of the scientific and medical advisory committee of PSC Partners Seeking a Cure and the Autoimmune Hepatitis Association, and a member of the International PSC Study Group.  

Dr. Assis is optimistic about developing better treatments for his patients. “There is much to be discovered in this field, and we are excited to bring about great progress within the next several years,” he says.


  • Associate Professor of Medicine

Education & Training

  • Fellowship
    Yale University School of Medicine (2013)
  • Fellowship
    Yale University School of Medicine (2012)
  • Residency
    Thomas Jefferson University Hospital (2009)
  • Internship
    Thomas Jefferson University, Hospital (2006)
  • MD
    Jefferson Medical College (2005)
  • BS
    Messiah College (2001)

Languages Spoken

  • English
  • Português (Portuguese)

Additional Information