Benign neoplasm of mesothelial tissue, unspecified

This code describes a non-cancerous growth originating from mesothelial tissue, which lines body cavities such as the pleura, peritoneum, and pericardium. It signifies a benign tumor where the specific type of mesothelial tissue involved is not documented.

Use this code when documentation confirms a benign mesothelial neoplasm but lacks specificity regarding the primary site (e.g., pleura, peritoneum, pericardium). This is appropriate when the pathology report identifies a benign mesothelial tumor without further anatomical detail, or when clinical findings suggest such a growth but a definitive primary site cannot be determined.

• Avoid using this code if a more specific site (e.g., pleura, peritoneum) is documented; instead, use the appropriate D19.x subcategory.
• Ensure the pathology report or physician documentation explicitly states "benign" to differentiate from malignant mesotheliomas (C45.-).
• If the neoplasm is of uncertain behavior, consider codes from the D37-D48 range, specifically D38.x for neoplasms of uncertain behavior of mesothelial and soft tissue.