Mammographic fatty tissue density, right breast

This code indicates a finding on a mammogram where the right breast tissue is predominantly composed of fatty tissue. This is a normal and common breast composition, often seen in older women or women who have had children, and generally suggests a lower risk of obscuring potential lesions compared to denser breast tissue.

Apply this code when a mammography report explicitly states "fatty tissue density" or "predominantly fatty" for the right breast. This finding is typically documented as part of the BI-RADS assessment for breast composition (e.g., BI-RADS A). It is often used in conjunction with a screening or diagnostic mammogram.

• Ensure the documentation specifies "right breast" for laterality.
• Do not confuse this with codes for dense breast tissue, which have different clinical implications and code assignments.
• This code typically serves as a secondary diagnosis when a screening mammogram is performed, with Z12.31 (Encounter for screening mammogram for malignant neoplasm of breast) as the primary.