ICD-10-CM > R00-R99 > R90-R94 > R92 > R92.3 > R92.32 R92.32 Mammographic fibroglandular density of breast Non-Billable/Non-Specific Applicable To Breast density category within Imaging Reporting and Data System (BI-RADS): B Codes R92.321Mammographic fibroglandular density, right breastR92.322Mammographic fibroglandular density, left breastR92.323Mammographic fibroglandular density, bilateral breasts