ICD-10-CM > R00-R99 > R90-R94 > R92 > R92.3 > R92.33 R92.33 Mammographic heterogeneous density of breast Non-Billable/Non-Specific Applicable To Breast density category within Imaging Reporting and Data System (BI-RADS): C Codes R92.331Mammographic heterogeneous density, right breastR92.332Mammographic heterogeneous density, left breastR92.333Mammographic heterogeneous density, bilateral breasts