International Classification of Diseases (ICD) codes used to identify previous cancer diagnoses, total hysterectomies and irritable bowel disease
| ICD-7/8 | ICD-10 | |
| Colorectal cancer | 153.x, 154.x, 253.x, 453.x, 454.x, 653.x, 654.x, 753.x, 754.x, 853.x, 854.x | C18-20 |
| Cervical cancer | 171.x, 671.x, 771.x, 871.x | C53 |
| Hysterectomy | ICD-8 (1977–1995) surgical procedure codes: opr61050, opr61020, opr72230, opr61040, opr72650, opr61100, opr72240, opr61780, opr62300 | ICD-10 surgical procedure codes: KLCD00, KLCD01, KLCD04, KLCD10, KLCD11, KLCD30, KLCD31, KLCD40, KLCD96, KLCD97, KLDC10, KLDC13, KLDC96, KLDC20, KLDC23, KZXX00, KMCA33, KLEF13, KLEF00B |
| Irritable bowel disease | DK50-51 |
Note: Danish Cancer Register used ICD-7 and Danish National Patient Register used ICD-8.