| ICD-10 Code | Description |
| O91.011 | Infection of nipple associated with pregnancy, first trimester |
| O91.012 | Infection of nipple associated with pregnancy, second trimester |
| O91.013 | Infection of nipple associated with pregnancy, third trimester |
| O91.019 | Infection of nipple associated with pregnancy, unspecified trimester |
| O91.02 | Infection of nipple associated with the puerperium |
| O91.03 | Infection of nipple associated with lactation |
| O91.111 | Abscess of breast associated with pregnancy, first trimester |
| O91.112 | Abscess of breast associated with pregnancy, second trimester |
| O91.113 | Abscess of breast associated with pregnancy, third trimester |
| O91.119 | Abscess of breast associated with pregnancy, unspecified trimester |
| O91.12 | Abscess of breast associated with the puerperium |
| O91.13 | Abscess of breast associated with lactation |
| 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 |
