2D44

ICD-11 MMS 2026-01

Malignant neoplasm, primary site unknown, so stated

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

  • Malignant neoplasm, primary site unknown, so stated
  • cancer of unknown primary, so stated
  • malignancy unknown primary site, so stated
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  • malignant neoplasm primary site unknown, so stated
  • unknown primary cancer, so stated
  • unknown primary malignancy, so stated
  • Metastatic cancer, unknown primary, so stated
  • metastatic cancer, unknown origin, so stated

Exclusions from above levels

  • 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

  • 2D40 – Adenocarcinoma of unspecified site
  • 2D41 – Unspecified carcinoma of unspecified site
  • 2D42 – Malignant neoplasms of ill-defined sites
  • 2D43 – Malignant neoplasms of independent, multiple primary sites
  • 2D4Y – Other specified malignant neoplasms of unspecified primary sites
  • 2D4Z – Unspecified malignant neoplasms of unspecified sites

Foundation entity

Malignant neoplasm, primary site unknown, so stated – http://id.who.int/icd/entity/483273481

Part of: 02: Neoplasms