Convert to ICD-10-CM: 
611.5 converts approximately to:
- 2015/16 ICD-10-CM N64.89 Other specified disorders of breast
 ICD-9-CM Volume 2 Index entries containing back-references to 
611.5:
- Cyst (mucus) (retention) (serous) (simple) milk 611.5 milk 611.5
 
- Galactocele (breast) (infected) 611.5 puerperal, postpartum 676.8 puerperal, postpartum 676.8