2C61.4

ICD-11 MMS 2026-01

Invasive carcinoma of breast, unidentifiable type

Description

A carcinoma that infiltrates the breast parenchyma and where the histopathological type could not be identified.

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

  • Invasive carcinoma of breast, unidentifiable type
  • infiltrating carcinoma of breast, unidentifiable type
  • invasive breast carcinoma of no special type

Exclusions from above levels

  • 2B56.2 – Angiosarcoma of breast
  • 2E0Y – Nipple metastasis
  • http://id.who.int/icd/entity/1706880799 – Malignant neoplasm of skin of breast
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  • http://id.who.int/icd/entity/1965082709 – Malignant mesenchymal neoplasms
  • 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

  • 2C61.0 – Invasive ductal carcinoma of breast
  • 2C61.1 – Invasive lobular carcinoma of breast
  • 2C61.2 – Invasive pleomorphic lobular carcinoma of breast
  • 2C61.3 – Invasive carcinoma of breast with mixed ductal and lobular features
  • 2C61.Y – Other invasive carcinoma of breast
  • 2C61.Z – Invasive carcinoma of breast, unspecified

Foundation entity

Invasive carcinoma of breast, unidentifiable type – http://id.who.int/icd/entity/692664921

Allowed postcoordination axes

Part of: 2C61: Invasive carcinoma of breast › 02: Neoplasms