Mammographic extreme density, bilateral breasts

This code indicates that both breasts exhibit extreme density on a mammogram, meaning the breast tissue is predominantly glandular and fibrous, with very little fat. This high density can obscure the detection of abnormalities, including cancers, on mammographic imaging. It is a finding related to breast composition rather than a specific disease.

Apply this code when mammography reports explicitly document "extreme density" or "ACR D" for both breasts. This finding is often noted as an incidental finding during routine screening or diagnostic mammograms. Documentation must clearly specify the bilateral nature of the extreme density.

• Do not confuse this with codes for specific breast lesions or masses; this code describes breast tissue composition.
• Ensure the documentation specifies "extreme" density; codes exist for other levels of breast density.
• This code is typically used as a secondary diagnosis, as it describes a finding rather than a primary reason for the encounter, unless the encounter is solely for breast density assessment.