Treat patients who suffer from various pancreatic diseases like Hepatitis B or C, hemochromatosis, autoimmune liver disease, cirrhosis, irritable bowel syndrome, ulcerative colitis, colon cancer, Crohn’s disease and many others. Overview: Essen Health Care is the largest privately held, multispecialty medical group in New York, providing high-quality, compassionate care to some of the state’s most vulnerable and underserved residents.