Table 1.
International Classification of Diseases, ninth edition, clinical modification codes used in defining study variables
| Diagnosis/procedure | ICD-9 |
| Diagnosis | |
| Chronic pancreatitis | 577.1 |
| Acute Pancreatitis | 577 |
| Cholangitis | 576.1 |
| Abdominal pain | 789.x |
| Jaundice | 782.4 |
| Cholelithiasis | 574.0, 574.1, 574.2, 574.6, 574.7, 574.8, 574.9 |
| Choledocholithiasis | 574.3, 574.4, 574.5, 574.6, 574.7, 574.8, 574.9 |
| Biliary obstruction | 5762 |
| Cholangiocarcinoma of bile duct or intrahepatic duct | 1551, 1561 |
| Malignant neoplasm of pancreas | 157.x |
| Solid tumor without metastasis | 1400-1729, 1740-1759, 179-1958, 20900-20924, 20925-2093, 20931-20936, 25801-25803 |
| Metastatic cancer | 1960-1991, 20970-20975, 20979, 78951 |
| Septic shock | 785.52 |
| Severe Sepsis | 995.92 |
| Systemic inflammatory response syndrome with acute organ dysfunction | 995.94 |
| Acute respiratory failure | 518.81 |
| Acute kidney failure | 584.9 |
| Thrombocytopenia | 2875 |
| Altered mental status | 780.97 |
| Abnormal coagulation | 790.92 |
| Procedure | |
| ERCP | |
| ERCP general code | 51.1 |
| Endoscopic sphincterotomy and papillotomy | 51.85 |
| Biliary ERCP | |
| Endoscopic Retrograde Cholangiography | 51.11 |
| Endoscopic dilation of ampulla and biliary duct | 51.84 |
| Endoscopic insertion of stent (tube) into bile duct | 51.87 |
| Endoscopic removal of stone (s) from biliary tract | 51.88 |
| Pancreatic ERCP | |
| Endoscopic Retrograde Pancreatography | 52.92 |
| Endoscopic insertion of stent (tube) into pancreatic duct | 52.93 |
| Endoscopic removal of stone (s) from pancreatic duct | 52.94 |
| Endoscopic dilation of pancreatic duct | 52.98 |
ICD-9: International Classification of Diseases, ninth edition; ERCP: Endoscopic retrograde cholangiopancreatography.