ICD-10-CM > Q00-QA0 > Q80-Q89 > Q83 Q83 Congenital malformations of breast Non-Billable/Non-Specific Type 2 Excludes absence of pectoral muscle (Q79.8)hypoplasia of breast (N64.82)micromastia (N64.82) Codes Q83.0Congenital absence of breast with absent nippleQ83.1Accessory breastQ83.2Absent nippleQ83.3Accessory nippleQ83.8Other congenital malformations of breastQ83.9Congenital malformation of breast, unspecified