Denise M. Harnois, D.O., is a gastroenterologist and transplant hepatologist with the Liver Transplant Program in the Transplant Center at Mayo Clinic in Jacksonville, Florida. She specializes in the care of complex liver conditions, including chronic liver disease, cholestatic liver disease, hepatobiliary cancer, and liver transplantation. Her clinical interests also include primary sclerosing cholangitis (PSC) and primary biliary cirrhosis (PBC). Dr. Harnois provides comprehensive, individualized care for people with advanced liver disease, emphasizing precise diagnosis, coordinated multidisciplinary treatment, and long-term liver health across the transplant.