ICD-10-CM > O00-O9A > O85-O92 > O91 > O91.0 O91.0 Infection of nipple associated with pregnancy, the puerperium and lactation Non-Billable/Non-Specific Codes O91.01Infection of nipple associated with pregnancyO91.011Infection of nipple associated with pregnancy, first trimesterO91.012Infection of nipple associated with pregnancy, second trimesterO91.013Infection of nipple associated with pregnancy, third trimesterO91.019Infection of nipple associated with pregnancy, unspecified trimesterO91.02Infection of nipple associated with the puerperiumO91.03Infection of nipple associated with lactation