ICD-11 classes
13 Diseases of the digestive system
Diseases of peritoneum
Neoplasms of peritoneum or retroperitoneum
2C50 — Malignant neoplasms of retroperitoneum

ICD-11 2C50 — Malignant neoplasms of retroperitoneum

A primary or metastatic malignant neoplasm involving the retroperitoneum. The vast majority of cases are carcinomas, lymphomas, or sarcomas.

The diagnosis includes nothing.

Diagnosis with code 2C50 contains 3 clarifying diagnoses:

1. 2C50.0 — Cystic, mucinous or serous carcinoma of retroperitoneum
2. 2C50.Y — Other specified malignant neoplasms of retroperitoneum
3. 2C50.Z — Malignant neoplasms of retroperitoneum, unspecified

The diagnosis is coded elsewhere:

• Malignant neoplasms of retroperitoneum, peritoneum or omentum #2208
• Malignant neoplasms of retroperitoneum #2209