2C51

ICD-11 MMS 2026-01

Malignant neoplasms of peritoneum

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

  • 2C50 – Malignant neoplasms of retroperitoneum
  • 2C52 – Malignant neoplasms of omentum
  • 2D91 – Malignant neoplasm metastasis in peritoneum
  • 2E0Y – Abdominal carcinomatosis
  • http://id.who.int/icd/entity/1965082709 – Malignant mesenchymal neoplasms

Exclusions from above levels

  • 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

Child codes

  • 2C51.0 – Adenocarcinomas of peritoneum
  • 2C51.1 – Cystic, mucinous or serous carcinoma of peritoneum
  • 2C51.2 – Mesotheliomas of peritoneum
  • 2C51.Y – Other specified malignant neoplasms of peritoneum
  • 2C51.Z – Malignant neoplasms of peritoneum, unspecified

Sibling codes

  • 2C50 – Malignant neoplasms of retroperitoneum
  • 2C52 – Malignant neoplasms of omentum
  • 2C53 – Malignant neoplasm involving overlapping sites of retroperitoneum, peritoneum or omentum

Foundation entity

Malignant neoplasms of peritoneum – http://id.who.int/icd/entity/315445782

Allowed postcoordination axes

Part of: 02: Neoplasms