Carcinoma in situ of gingiva and edentulous alveolar ridge

This code signifies the presence of non-invasive malignant cells confined to the epithelial layer of the gingiva or the edentulous alveolar ridge. It represents an early stage of cancer where the abnormal cells have not spread beyond the original tissue.

Apply this code when documentation confirms a diagnosis of carcinoma in situ affecting the gum tissue or the toothless portion of the jawbone. This typically follows a biopsy revealing high-grade dysplasia or intraepithelial neoplasia without evidence of invasion.

• Ensure the pathology report explicitly states "in situ" or "intraepithelial neoplasia" for the specified sites.
• Do not use this code if there is any evidence of invasion into the underlying connective tissue; instead, report an invasive carcinoma code.
• Distinguish carefully from benign lesions or dysplastic changes that do not meet the criteria for carcinoma in situ.