Other specified type of carcinoma in situ of right breast

This code signifies the presence of non-invasive malignant cells confined to the ducts or lobules of the right breast, but which do not fit the criteria for ductal carcinoma in situ (DCIS) or lobular carcinoma in situ (LCIS). It represents a pre-invasive form of breast cancer where the abnormal cells have not spread beyond their original location.

Use this code when pathology reports confirm a diagnosis of carcinoma in situ of the right breast that is explicitly described as "other specified type," such as papillary carcinoma in situ or micropapillary carcinoma in situ, and is not classified as DCIS or LCIS. Documentation must clearly specify the right breast and the particular type of in situ carcinoma.

• Ensure the pathology report explicitly states "right breast" and a specific type of in situ carcinoma other than DCIS or LCIS.
• Do not use this code for unspecified carcinoma in situ; a more specific code exists for that scenario.
• Confirm the carcinoma is truly "in situ" and has not invaded the surrounding tissue; invasive carcinoma codes would be inappropriate.