Carcinoma in situ of unspecified bronchus and lung

This code signifies the presence of abnormal, non-invasive epithelial cells confined to the basement membrane of the bronchus or lung, without evidence of invasion into surrounding tissue. It represents a pre-invasive form of cancer, often referred to as Stage 0 lung cancer.

This code is appropriate when pathology reports confirm carcinoma in situ of the bronchus or lung, but the specific location (e.g., main bronchus, lobar bronchus) is not documented. It is used when the malignancy is definitively identified as non-invasive and confined to the epithelial layer.

• Ensure documentation explicitly states "carcinoma in situ" and that no invasion is present.
• Avoid using this code if the specific bronchus or lung lobe is identified; instead, use a more specific code from the D02.2 subcategory.
• Do not use this code for atypical adenomatous hyperplasia or squamous dysplasia, which are precursor lesions but not carcinoma in situ.