Colorectal cancer screening participation among citizens not recommended to be screened: a cohort study

BMC Gastroenterology

Table 1 Disease groups and defining International Classification of Diseases (ICD) codes

		ICD codes
Included disease groups
1a	CRC	ICD-10: C18, C19, C20* ICD-7: 153, 153.0, 153.4, 153.5, 154.9, 253.0, 253.1, 253.2, 253.3, 253.4, 453.0, 453.1, 453.2, 453.3, 453.4, 453.5, 453.8, 454.9, 853.0, 853.1, 853.2, 853.3, 853.4, 853.5, 854.9, 154, 154.0, 454.0, 854.0
1b	IBD with PSC	ICD-10: K50* or K51* combined with DK839F
1c	Multiple polyps and polyps associated with hereditary CRC syndromes	ICD-10 DD126A (Adenomatosis coli) DD126B (Polyposis hereditaria coli) DD126C (Multiple benign neoplasms in the colorectum) DD126F (Familial adenomatous polyposis)
2a	Ulcerative colitis without PSC	ICD-10: K51* ICD-8: 563.19, 569.04
2b	Crohn's disease without PSC	ICD-10: K50* ICD-8: 563.00–563.02, 563.08, 563.09
Excluded disease groups
Other colorectal polyps within the last 10 years		ICD-10: D120, D121, D122, D123, D124, D125, DD126, D128, D129

Groups rated according to inclusion hierarchy from 1a to 2b. Residents with more than one diagnose are only included in the highest rated disease group
CRC, colorectal cancer; IBD, inflammatory bowel disease (ulcerative colitis or Crohn's diseases); PSC, primary sclerosing cholangitis including all codes starting with the specific letters and numbers
*Including all underlying codes, **DD indicating it is the Danish version of ICD-10, were can include underlying codes annotated with letters in the end

ISSN: 1471-230X