2B80.20

ICD-11 MMS 2026-01

Adenocarcinoma of small intestine, site unspecified

Description

A malignant tumour with glandular differentiation arising from epithelium of small intestine.

Coding note from above levels

For use of this category, reference should be made to the mortality coding rules and guidelines in the Reference Guide.

Index terms

  • Adenocarcinoma of small intestine, site unspecified
  • Adenocarcinoma of overlapping lesion of small intestine

Excludes

  • 2B80.21 – Neuroendocrine neoplasms of small intestine, site unspecified

Exclusions from above levels

  • http://id.who.int/icd/entity/1965082709 – Malignant mesenchymal neoplasms
  • http://id.who.int/icd/entity/111033337 – Malignant neoplasm metastasis in digestive system
  • http://id.who.int/icd/entity/794095161 – Malignant neoplasms of lip, oral cavity or pharynx
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  • http://id.who.int/icd/entity/879154182 – Neoplasms of central nervous system or related structures
  • http://id.who.int/icd/entity/944754984 – Neoplasms of haematopoietic or lymphoid tissues

Sibling codes

  • 2B80.21 – Neuroendocrine neoplasms of small intestine, site unspecified
  • 2B80.2Y – Other specified malignant neoplasms of small intestine, site unspecified

Foundation entity

Adenocarcinoma of small intestine, site unspecified – http://id.who.int/icd/entity/1369513329

Allowed postcoordination axes

Part of: 2B80.2: Malignant neoplasms of small intestine, site unspecified › 2B80: Malignant neoplasms of small intestine › 02: Neoplasms