2C27.2

ICD-11 MMS 2026-01

Thymoma

Description

A thymoma that has an aggressive clinical course (capsular invasion, infiltration of the surrounding tissues) and can metastasize. Although any morphologic subtype of thymoma may eventually have a malignant clinical course, this term is most often associated with thymoma types B3 and C.

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

  • Thymoma
  • benign thymoma (deprecated)
  • malignant thymoma (deprecated)
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  • Thymoma type A of thymus
  • malignant type A thymoma
  • Thymoma type AB of thymus
  • malignant type AB thymoma
  • Thymoma type B of thymus
  • malignant B3 thymoma
  • malignant type B1 thymoma
  • malignant type B2 thymoma

Exclusions from above levels

  • 2E0Y – Malignant neoplasm metastasis in thymus gland
  • http://id.who.int/icd/entity/1965082709 – Malignant mesenchymal neoplasms
  • 2C51.2 – Mesotheliomas of peritoneum
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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

  • 2C27.0 – Carcinoma of thymus
  • 2C27.1 – Carcinoid tumour or other neuroendocrine neoplasms of thymus
  • 2C27.Y – Other specified malignant neoplasms of thymus
  • 2C27.Z – Malignant neoplasms of thymus, unspecified

Foundation entity

Thymoma – http://id.who.int/icd/entity/33869057

Allowed postcoordination axes

Part of: 2C27: Malignant neoplasms of thymus › 02: Neoplasms