Carcinoma in situ of bronchus and lung

This code signifies the presence of abnormal, malignant cells confined to the epithelial layer of the bronchus or lung, without invasion into deeper tissues. It represents a pre-invasive form of cancer, often referred to as non-invasive carcinoma or intraepithelial neoplasia, specifically within the respiratory tract.

Apply this code when pathology reports confirm carcinoma in situ of the bronchus or lung. Documentation should clearly state "in situ," "non-invasive," or "intraepithelial carcinoma" within these specific anatomical sites. This code is appropriate for initial diagnosis and subsequent follow-up of this pre-invasive condition.

• Ensure the pathology report explicitly states "in situ" and specifies bronchus or lung as the primary site.
• Do not use this code if there is any evidence of invasion; instead, select a code for malignant neoplasm.
• Distinguish carefully from atypical hyperplasia or dysplasia, which are not coded as carcinoma in situ.