Oth type of carcinoma in situ of unspecified breast

This code signifies the presence of non-invasive cancerous cells within the ducts or lobules of the breast, which have not spread beyond their original location. It represents a pre-invasive form of breast cancer where the abnormal cells are confined to the tissue of origin, but the specific type of carcinoma in situ is not further detailed in the medical record.

Use this code when documentation indicates a diagnosis of carcinoma in situ of the breast, and the specific histological type (e.g., ductal, lobular) is not specified, but it is known not to be an unspecified type (D05.90). This is often seen in pathology reports where the in situ nature is confirmed, but further subtyping is pending or not provided.

• Do not use this code if the documentation specifies ductal carcinoma in situ (DCIS) or lobular carcinoma in situ (LCIS); use the more specific codes D05.1- or D05.0-, respectively.
• Ensure the documentation clearly states "in situ" and not invasive carcinoma.
• If the laterality (right, left, bilateral) is known, use the appropriate subcategory (e.g., D05.81, D05.82, D05.89).