ICD-10-CM > O00-O9A > O85-O92 > O91 > O91.1 O91.1 Abscess of breast associated with pregnancy, the puerperium and lactation Non-Billable/Non-Specific Codes O91.11Abscess of breast associated with pregnancyO91.111Abscess of breast associated with pregnancy, first trimesterO91.112Abscess of breast associated with pregnancy, second trimesterO91.113Abscess of breast associated with pregnancy, third trimesterO91.119Abscess of breast associated with pregnancy, unspecified trimesterO91.12Abscess of breast associated with the puerperiumO91.13Abscess of breast associated with lactation