Carcinoma in situ of eye

This code represents the presence of abnormal, pre-invasive cancerous cells confined to the outermost layer of the eye tissue, specifically the conjunctiva or cornea, without invading deeper structures. It signifies a localized, non-invasive form of malignancy.

Use this code when documentation clearly indicates a diagnosis of carcinoma in situ affecting the ocular surface. This typically follows a biopsy confirming dysplastic or neoplastic cells that have not breached the basement membrane.

• Differentiate from invasive carcinoma of the eye, which would be coded to a malignant neoplasm of the eye (190.x).
• Ensure the pathology report explicitly states "in situ" or "intraepithelial neoplasia" without evidence of invasion.
• Do not use for benign lesions or dysplasias that are not explicitly termed carcinoma in situ.