ICD-10-CM > N00-N99 > N60-N65 > N64 > N64.8 > N64.82 N64.82 Hypoplasia of breast Billable/Specific Copy Code Copy Description Applicable To Micromastia Type 1 Excludes congenital absence of breast (Q83.0)hypoplasia of native breast in relation to reconstructed breast (N65.1)