Intraductal carcinoma in situ of unspecified breast

This code signifies the presence of abnormal, cancerous cells confined within the milk ducts of the breast, without evidence of invasion into surrounding breast tissue. It represents a non-invasive form of breast cancer, often referred to as ductal carcinoma in situ (DCIS).

Utilize this code when documentation confirms a diagnosis of intraductal carcinoma in situ where the specific breast (left or right) is not specified. This typically occurs when pathology reports indicate DCIS but do not lateralize the finding, or when imaging reports identify a suspicious lesion consistent with DCIS without laterality.

• Do not use this code if the laterality (left or right breast) is documented; instead, select the more specific D05.11 or D05.12.
• Ensure the pathology report explicitly states "in situ" or "non-invasive" to differentiate from invasive carcinoma.
• This code should be sequenced as the primary diagnosis when DCIS is the reason for the encounter, unless a more definitive treatment or complication is being addressed.