ICD-10-CM > N00-N99 > N60-N65 > N60 > N60.3 N60.3 Fibrosclerosis of breast Non-Billable/Non-Specific Applicable To Cystic mastopathy with epithelial proliferation Codes N60.31Fibrosclerosis of right breastN60.32Fibrosclerosis of left breastN60.39Fibrosclerosis of unspecified breast