Ectopic tissue in lung

This code signifies the presence of non-pulmonary tissue within the lung parenchyma, which is an anomaly where tissue normally found elsewhere in the body develops in the lung. This can include various tissue types such as cartilage, bone, or glandular tissue, and is distinct from metastatic disease or primary lung tumors.

Apply this code when diagnostic imaging (e.g., CT scan, MRI) or pathological examination confirms the presence of ectopic tissue within the lung. This is typically an incidental finding or discovered during investigation of respiratory symptoms where other causes have been ruled out. Documentation should clearly state "ectopic tissue in lung" or describe the specific type of ectopic tissue identified within the lung.

• Differentiate from hamartomas (D14.30-D14.39), which are malformations of normal lung components, not ectopic tissue.
• Do not use for metastatic lesions, which are coded based on the primary malignancy site.
• Ensure documentation specifies the lung as the location of the ectopic tissue to avoid confusion with other anatomical sites.