Introduction: Procedure related complications and cost of therapeutic ERCP in patients with cirrhosis were compared to patients without cirrhosis. Disease severity scores were used to stratify procedure risks. Patients and Methods: Outcome and complications of therapeutic ERCP were prospectively studied in patients with cirrhosis and compared to patients without cirrhosis undergoing ERCP. Patients with cirrhosis were evaluated using liver scores. Results: The study included 150 patients with cirrhosis (60% males, mean age 60+/-12.4 years), and 150 patients without cirrhosis (56% males, mean age 52.4+/-20.3 years). Biliary cannulation was successful in 98% and 98.3% of patients with and without cirrhosis. Clinical pancreatitis, perforation, bleeding and cardiopulmonary complications were not different in patients with and without cirrhosis (8% vs 9.3, 0% vs 2%, 3.3% vs 4%, and 4% vs 2% respectively), while cholangitis occurred more frequently in patients with cirrhosis (13.3% vs 1.3% respectively). Hospital stay was longer and mortality and costs were significantly higher among patients with cirrhosis. Patients with Child C cirrhosis developed more complications and had higher mortality. A MELD score cut off of ≥11.5 separated all mortalities. Conclusions: Patients with cirrhosis experienced more complications and costs, and patients with cirrhosis who developed moderate to severe complications were more likely to die.