O91.12 — Abscess of breast associated with the puerperium
Is O91.12 billable?
Yes — O91.12 is billable for FY2027. O91.12 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. O91.12 may be submitted for encounters from October 1, 2026 through September 30, 2027.
O91.12 at a glance
| Code | O91.12 |
|---|---|
| Description | Abscess of breast associated with the puerperium |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does O91.12 group to?
O91.12 sits in MDC 14 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 769Postpartum and Post Abortion Diagnoses with O.R. Proceduressurgical
How is O91.12 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to O91.12. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Puerperal, puerperium › abscess › breast (complicated by, complications)
- Puerperal, puerperium › abscess › mammary (complicated by, complications)
- Puerperal, puerperium › abscess › subareolar (complicated by, complications)
- Puerperal, puerperium › fistula › breast (complicated by, complications)
- Puerperal, puerperium › mastitis › purulent (complicated by, complications)
- Suppuration, suppurative › mammary gland › puerperal, postpartum
- Mastitis › obstetric › purulent › associated with › puerperium (acute) (diffuse) (nonpuerperal) (subacute)
Inclusion terms
Alternative wording in documentation that is classified to O91.12.
- Puerperal mammary abscess
- Puerperal purulent mastitis
- Puerperal subareolar abscess
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O91.12 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- supervision of normal pregnancy (Z34.-)
Use additional code — inherited from Chapter 15
Report an additional code alongside O91.12 to fully describe the condition. O91.12 is sequenced first.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Use additional code — inherited from O91
Report an additional code alongside O91.12 to fully describe the condition. O91.12 is sequenced first.
- code to identify infection
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O91.12, but a patient may have both at the same time. When documentation supports it, O91.12 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O85-O92
The conditions below are not part of O91.12, but a patient may have both at the same time. When documentation supports it, O91.12 and the excluded code may both be reported.
How long has O91.12 existed?
O91.12 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.