Mammographic fatty tissue density, bilateral breasts

This code indicates a finding on a mammogram where both breasts are composed predominantly of fatty tissue. This breast composition is generally associated with a lower risk of cancer being obscured by dense tissue. It is a normal variant of breast density.

Use this code when mammography reports explicitly state "fatty tissue density" or "almost entirely fatty" for both breasts. This finding is typically documented in the "Breast Composition" or "Impression" section of a mammography report. It is often seen in older women or those with a lower body mass index.

• Do not use this code if the report indicates scattered fibroglandular densities or heterogeneous/extremely dense breasts.
• This code represents a normal finding and should not be sequenced as the primary diagnosis if a more definitive breast condition (e.g., a mass, calcifications) is identified and being investigated.
• Ensure the documentation specifies "bilateral" to support the use of this specific code; otherwise, a unilateral code may be more appropriate.