Mammographic extreme density, left breast

This code indicates a finding from a mammogram showing extremely dense fibroglandular tissue in the left breast, which can obscure the detection of abnormalities. This level of density is the highest category (Category D) in the BI-RADS classification system.

Apply this code when mammography reports specifically document "extreme density" or "BI-RADS Category D" for the left breast. Documentation must clearly specify the laterality. This finding often necessitates supplemental imaging.

• Ensure the documentation explicitly states "extreme density" or "BI-RADS Category D" for the left breast.
• Do not use this code for other levels of breast density (e.g., heterogeneous density).
• This code is often reported in conjunction with codes for screening mammography or diagnostic mammography.