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 diagnosis | 96 (15.6) | |
| No hospital admission | 265 (42.9) | |
| Registry diagnosis | ||
| False positives (N=950) | Pancreatic or periampullary cancer diagnosed prior to 2005 | 480 (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 cancer | 217 (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.