Mammographic fatty tissue density, left breast

This code indicates a finding on a mammogram where the left breast tissue is predominantly composed of fatty tissue. This is a normal and common breast composition, often associated with lower breast cancer risk due to less dense glandular tissue.

This code is used when a mammogram report specifically documents "fatty tissue density" or "almost entirely fatty" for the left breast. It is typically an incidental finding reported as part of a screening or diagnostic mammogram interpretation. Documentation should clearly state the breast density classification for the left breast.

• Ensure the laterality (left breast) is explicitly documented; do not assume.
• This code represents a normal finding and should not be confused with codes for dense breast tissue (e.g., R92.32x, R92.33x, R92.34x).
• Always sequence this code after any definitive diagnosis for which the mammogram was performed, if applicable.