2B81

ICD-11 MMS 2026-01

Malignant neoplasms of appendix

Description

A primary malignant neoplasm that affects the appendix.

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.

Excludes

  • http://id.who.int/icd/entity/1965082709 – Malignant mesenchymal neoplasms

Exclusions from above levels

  • 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
  • http://id.who.int/icd/entity/879154182 – Neoplasms of central nervous system or related structures
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  • http://id.who.int/icd/entity/944754984 – Neoplasms of haematopoietic or lymphoid tissues

Child codes

  • 2B81.0 – Adenocarcinoma of appendix
  • 2B81.2 – Neuroendocrine neoplasms of appendix
  • 2B81.Y – Other specified malignant neoplasms of appendix
  • 2B81.Z – Malignant neoplasms of appendix, unspecified

Sibling codes

  • 2B80 – Malignant neoplasms of small intestine
  • 2C00 – Malignant neoplasms of anus or anal canal
  • 2C0Y – Other specified malignant neoplasms of intestine
  • 2C0Z – Malignant neoplasms of intestine, unspecified

Foundation entity

Malignant neoplasms of appendix – http://id.who.int/icd/entity/1892026854

Allowed postcoordination axes

Part of: 02: Neoplasms