ICD-10-CM > N00-N99 > N60-N65 > N60 > N60.9 N60.9 Unspecified benign mammary dysplasia Non-Billable/Non-Specific Codes N60.91Unspecified benign mammary dysplasia of right breastN60.92Unspecified benign mammary dysplasia of left breastN60.99Unspecified benign mammary dysplasia of unspecified breast