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  2. ICD-10-CM Codes List
  3. O00-O9A
  4. O85-O92
  5. Infections of breast associated with pregnancy, the puerperium and lactation (O91)

Infections of breast associated with pregnancy, the puerperium and lactation (O91)

ICD-10 codes in the O91 section cover infections and inflammatory conditions of the breast specifically related to pregnancy, the puerperium (postpartum period), and lactation. These codes help identify and classify various infections such as nipple infections, breast abscesses, and mastitis occurring during these stages.

This section details conditions like nipple infections (O91.0 series), which can occur during pregnancy or breastfeeding, and includes subcodes specifying the trimester involved for pregnancy-related cases. It also includes breast abscesses (O91.1 series), which are localized collections of pus associated with pregnancy or lactation, and similarly, these have trimester-specific subcodes. The category for nonpurulent mastitis (O91.2 series) covers inflammatory breast conditions without pus, occurring during pregnancy, postpartum, or lactation. Synonyms such as obstetric nipple infection, postpartum mastitis, and breast abscess during lactation often relate to these official ICD-10 codes, aiding coders and clinicians in linking clinical terms to the correct code. Thus, the ICD-10 code for infections of breast associated with pregnancy, the puerperium and lactation assists accurate documentation and treatment monitoring of these specific maternal breast conditions.

  • Pregnancy, childbirth and the puerperium (O00-O9A)

    • Complications predominantly related to the puerperium (O85-O92)

        • Infections of breast associated with pregnancy, the puerperium and lactation (O91)

        • O91 Infections of breast associated with pregnancy, the puerperium and lactation
        • O91.0 Infection of nipple associated with pregnancy, the puerperium and lactation
        • O91.01 Infection of nipple associated with pregnancy
        • 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
        • O91.1 Abscess of breast associated with pregnancy, the puerperium and lactation
        • O91.11 Abscess of breast associated with pregnancy
        • 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
        • O91.2 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

Instructional Notations

Use Additional Code

The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.

  • code to identify infection