ICD-10-CM > R00-R99 > R90-R94 > R92 > R92.3 > R92.34 R92.34 Mammographic extreme density of breast Non-Billable/Non-Specific Applicable To Breast density category within Imaging Reporting and Data System (BI-RADS): D Codes R92.341Mammographic extreme density, right breastR92.342Mammographic extreme density, left breastR92.343Mammographic extreme density, bilateral breasts