O91.11
Abscess of breast associated with pregnancy
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 8 never code together
Instructional notes 11
O91code
Use additional code
- code to identify infection
O91.11code
Inclusion terms
- Gestational mammary abscess
- Gestational purulent mastitis
- Gestational subareolar abscess
O00-O9Achapter
Notes
- CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
- Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
- Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
- 1st trimester- less than 14 weeks 0 days
- 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
- 3rd trimester- 28 weeks 0 days until delivery
Use additional code
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.Z3A
Index entries leading here 4
- Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
- Pregnancy (single) (uterine) Z33.1
- complicated by (care of) (management affected by)
- abscess or cellulitis
- breast O91.11
- abscess or cellulitis
- complicated by (care of) (management affected by)
- Mastitis (acute) (diffuse) (nonpuerperal) (subacute) N61.0
- obstetric (interstitial) (nonpurulent)
- purulent
- associated with
- pregnancy O91.11
- associated with
- purulent
- obstetric (interstitial) (nonpurulent)
- Gestational
Alongside this code 2 same parent — O91.1
Subordinate codes 4
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.