ICD-10-CM · Chapter 15 · O00-O9A
O91 Infections of breast associated with pregnancy, the puerperium and lactation
Use Additional Code
- code to identify infection
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| O91..0 | Infection of nipple associated with pregnancy, the puerperium and lactation | No |
| O91..01 | Infection of nipple associated with pregnancy | No |
| O91..011 | Infection of nipple associated with pregnancy, first trimester | Yes |
| O91..012 | Infection of nipple associated with pregnancy, second trimester | Yes |
| O91..013 | Infection of nipple associated with pregnancy, third trimester | Yes |
| O91..019 | Infection of nipple associated with pregnancy, unspecified trimester | Yes |
| O91..02 | Infection of nipple associated with the puerperium | Yes |
| O91..03 | Infection of nipple associated with lactation | Yes |
| O91..1 | Abscess of breast associated with pregnancy, the puerperium and lactation | No |
| O91..11 | Abscess of breast associated with pregnancy | No |
| O91..111 | Abscess of breast associated with pregnancy, first trimester | Yes |
| O91..112 | Abscess of breast associated with pregnancy, second trimester | Yes |
| O91..113 | Abscess of breast associated with pregnancy, third trimester | Yes |
| O91..119 | Abscess of breast associated with pregnancy, unspecified trimester | Yes |
| O91..12 | Abscess of breast associated with the puerperium | Yes |
| O91..13 | Abscess of breast associated with lactation | Yes |
| O91..2 | Nonpurulent mastitis associated with pregnancy, the puerperium and lactation | No |
| O91..21 | Nonpurulent mastitis associated with pregnancy | No |
| O91..211 | Nonpurulent mastitis associated with pregnancy, first trimester | Yes |
| O91..212 | Nonpurulent mastitis associated with pregnancy, second trimester | Yes |
| O91..213 | Nonpurulent mastitis associated with pregnancy, third trimester | Yes |
| O91..219 | Nonpurulent mastitis associated with pregnancy, unspecified trimester | Yes |
| O91..22 | Nonpurulent mastitis associated with the puerperium | Yes |
| O91..23 | Nonpurulent mastitis associated with lactation | Yes |
Last reviewed: September 2026