Malignant neoplasm of mediastinum, part unspecified

This code signifies a primary cancerous tumor originating within the mediastinum, a central compartment of the thoracic cavity, when the specific sub-anatomical part (e.g., anterior, middle, posterior) is not documented. It indicates a malignant growth affecting structures such as the thymus, lymph nodes, nerves, or connective tissue within this region.

Apply this code when the medical record clearly states a malignant neoplasm of the mediastinum but lacks further specificity regarding the exact mediastinal compartment involved. This is appropriate for pathology reports confirming malignancy without precise localization within the mediastinum, or imaging reports describing a mediastinal mass confirmed as malignant without further detail.

• Always seek clarification from the provider if the specific mediastinal compartment (e.g., anterior, posterior) is mentioned in the documentation, as more specific codes exist.
• Do not use this code for secondary (metastatic) neoplasms to the mediastinum; instead, use C79.89 (Secondary malignant neoplasm of other specified sites).
• Sequence this code as the primary diagnosis when the mediastinal malignancy is the reason for the encounter, unless another condition is clearly identified as the principal diagnosis.