O91 - Infections of breast associated with pregnancy, the puerperium and lactation
O91.2 - Nonpurulent mastitis associated with pregnancy, the puerperium and lactation
O91.21 - Nonpurulent mastitis associated with pregnancy
O91.211 - Nonpurulent mastitis associated with pregnancy, first trimester
O91.212 - Nonpurulent mastitis associated with pregnancy, second trimester
O91.213 - Nonpurulent mastitis associated with pregnancy, third trimester
O91.219 - Nonpurulent mastitis associated with pregnancy, unspecified trimester
O91.22 - Nonpurulent mastitis associated with the puerperium
O91.23 - Nonpurulent mastitis associated with lactation