O91.11
Abscess of breast associated with pregnancy
O91.11 is a non-billable ICD-10-CM code header for abscess of breast associated with pregnancy. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are 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 and O91.119 Abscess of breast associated with pregnancy, unspecified trimester. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 7 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The trimester character comes from the provider's documentation for the current encounter. The unspecified trimester code should rarely be used.
Use additional code
Add the listed code as a secondary code, if known.
- code to identify infection
Also from chapter/block level (1 note)
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Also from chapter/block level (1 note)
- supervision of normal pregnancy (Z34.-)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (7 notes)
Inclusion terms
Conditions classified to this code.
- Gestational mammary abscess
- Gestational purulent mastitis
- Gestational subareolar abscess
Notes
Also from chapter/block level (6 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
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 7 entries
- Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic), gestational mammary
- Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic), gestational subareolar
- Gestational, mammary abscess
- Gestational, purulent mastitis
- Gestational, subareolar abscess
- Mastitis (acute) (diffuse) (nonpuerperal) (subacute), obstetric (interstitial) (nonpurulent), purulent, associated with, pregnancy
- Pregnancy (single) (uterine), complicated by (care of) (management affected by), abscess or cellulitis, breast
More specific codes under O91.11 4
- O91.111Abscess of breast associated with pregnancy, first trimesterBillable
- O91.112Abscess of breast associated with pregnancy, second trimesterBillable
- O91.113Abscess of breast associated with pregnancy, third trimesterBillable
- O91.119Abscess of breast associated with pregnancy, unspecified trimesterBillable