Neoplasm of uncertain behavior of respiratory organ, unsp

This code signifies a growth within the respiratory system whose biological behavior (benign vs. malignant) cannot be definitively determined from the available pathology. It indicates that the lesion exhibits features that are neither clearly benign nor clearly malignant, requiring further investigation or observation.

Use this code when pathology reports describe a respiratory lesion as "uncertain behavior," "borderline," or "indeterminate," and the specific organ within the respiratory system is not documented. This is often an interim diagnosis while awaiting further diagnostic studies or definitive surgical resection.

• Avoid using this code if a more specific site within the respiratory system (e.g., lung, bronchus) is documented; instead, use the corresponding D38.x code.
• Do not use this code if the pathology definitively states benign (D14.x) or malignant (C34.x for lung, C32.x for larynx, etc.).
• Always query the provider for clarification if the pathology report provides conflicting or ambiguous information regarding the behavior or specific site of the neoplasm.