Mesothelioma of other sites

This code signifies a malignant tumor originating from the mesothelial cells, specifically when it occurs in anatomical locations other than the pleura, peritoneum, or pericardium. These "other sites" can include the tunica vaginalis testis or other rare mesothelial linings. It represents a primary cancer, not a metastasis.

Use this code when documentation clearly specifies mesothelioma in a site other than the pleura, peritoneum, or pericardium. This typically requires pathological confirmation of mesothelioma and precise anatomical localization by the treating physician. Avoid using this code if a more specific site code (e.g., pleural, peritoneal) is available.

• Ensure the medical record explicitly states "mesothelioma" and specifies an "other site" to support this code.
• Do not use this code for metastatic mesothelioma; it is for primary tumors only.
• Always review the pathology report for definitive diagnosis and site identification.