Carcinoma in situ of esophagus

This code signifies the presence of abnormal, cancerous cells confined to the superficial layer of the esophageal lining, without invasion into deeper tissues. It represents a pre-invasive form of cancer, often referred to as high-grade dysplasia or intraepithelial neoplasia, which has the potential to progress to invasive carcinoma if left untreated.

Apply this code when diagnostic procedures, such as endoscopy with biopsy, confirm the presence of carcinoma in situ within the esophagus. Documentation should clearly state "carcinoma in situ," "high-grade dysplasia," or "intraepithelial neoplasia" of the esophagus, indicating no evidence of invasion.

• Do not use this code if there is any evidence of invasion beyond the basement membrane; instead, a code for invasive esophageal carcinoma would be appropriate.
• Distinguish carefully from low-grade dysplasia or Barrett's esophagus without dysplasia, which are coded differently.
• Ensure the pathology report explicitly states "in situ" or an equivalent term to support this diagnosis.