Malignant neoplasm of thorax

This code identifies a primary cancerous tumor originating in the thoracic region, excluding specific organs like the lung, heart, or mediastinum. It signifies a malignant growth within the chest wall, diaphragm, or other unspecified intrathoracic sites. This diagnosis indicates the presence of an aggressive, uncontrolled cellular proliferation in this anatomical area.

Apply this code when documentation specifies a primary malignant neoplasm of the thorax without further anatomical specificity. This is appropriate for diagnoses such as "malignant tumor of chest wall," "thoracic malignancy NOS," or "malignant neoplasm of diaphragm." Supporting documentation should clearly indicate the primary nature of the tumor and its thoracic location.

• Avoid using this code if a more specific anatomical site within the thorax (e.g., lung, pleura, mediastinum) is documented; use the appropriate site-specific code instead.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter, unless treatment is directed at a secondary site.
• Ensure the documentation clarifies whether the neoplasm is primary or secondary; if secondary, a code from category C79.- would be more appropriate.