Carcinoma in situ of penis

This code describes a non-invasive, pre-malignant lesion of the penis where abnormal cells are confined to the epithelial layer without invading deeper tissues. It represents the earliest stage of penile cancer, often referred to as Bowen's disease of the penis or erythroplasia of Queyrat.

Assign this code when documentation clearly indicates carcinoma in situ of the penis, confirmed by biopsy. This typically applies to cases where the abnormal cells are entirely contained within the epidermis or mucosal surface, without evidence of stromal invasion.

• Ensure the pathology report explicitly states "carcinoma in situ" and specifies the penis as the site.
• Do not use this code for invasive penile carcinoma; refer to codes in the C60 series for malignant neoplasms.
• Distinguish from benign penile lesions or dysplastic changes that do not meet the criteria for carcinoma in situ.