Table 2

Diagnoses (International Statistical Classification of Diseases and Related Health Problems, 10th Revision, Australian Modification, ICD-10-AM) recorded for false negatives and false positives, 2005–2009

N (%)
Hospital diagnosis*
False negatives (N=617)Intrahepatic bile duct carcinoma (cholangiocarcinoma) (C22.1)49 (7.9)
Gallbladder cancer (C23)10 (1.6)
Cancer of ill-defined or unspecified site (C26, C76, C80)80 (13.0)
Secondary cancer of the liver, other or unspecified digestive organ (C78.7, C78.8)23 (3.7)
Neoplasms with in situ, benign, uncertain or unknown behaviour of the pancreas, small intestine, biliary tract, ill-defined or unspecified digestive organs†29 (4.7)
Calculus of the bile duct and other biliary tract diseases (K80.3-5, K83)54 (8.8)
Acute pancreatitis and other diseases of the pancreas (K85, K86)11 (1.8)
Other diagnosis96 (15.6)
No hospital admission265 (42.9)
Registry diagnosis
False positives (N=950)Pancreatic or periampullary cancer diagnosed prior to 2005480 (50.5)
Intrahepatic bile duct carcinoma (cholangiocarcinoma) (C22.1)107 (11.3)
Gallbladder cancer (C23)47 (4.9)
Cancer of ill-defined or unspecified site (C26, C76, C80)99 (10.4)
Other cancer217 (22.8)
  • *People had more than one diagnosis category recorded in admissions. The category was assigned hierarchically to avoid double counting people.

  • †D01.5, D01.7, D01.9, D13.2-9, D37.2, D37.6, D37.7, D37.9.