Early vs late endoscopic retrograde cholangiopancreatography in patients with acute cholangitis: A nationwide analysis

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.