O91.1

Non-Billable

ChapterO00–O9A

Ranksubcategory

Official Description

Abscess of breast associated with pregnancy, the puerperium and lactation

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 15: Pregnancy, Childbirth and the Puerperium (O00-O9A).

General instructions are available for the parent sections:

View CH15 Notes View O85-O92 Notes View O91 Notes

Clinical Hierarchy

CH15Pregnancy, childbirth and the puerperium (O00-O9A)

O85-O92Complications predominantly related to the puerperium (O85-O92)

O91Infections of breast associated with pregnancy, the puerperium and lactation

O91.1Abscess of breast associated with pregnancy, the puerperium and lactation

O91.11Abscess of breast associated with pregnancy

O91.12Abscess of breast associated with the puerperium

O91.13Abscess of breast associated with lactation

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to O91.1:

categoryO91

Infections of breast associated with pregnancy, the puerperium and lactation

View context instructions

blockO85-O92

Complications predominantly related to the puerperium (O85-O92)

View context instructions

chapterCH15

Pregnancy, childbirth and the puerperium (O00-O9A)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to O91.1. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

21 raw paths

Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)2 unique routes

gestational mammary→O91.1

gestational subareolar→O91.1

Gestational3 unique routes

mammary abscess→O91.1

purulent mastitis→O91.1

subareolar abscess→O91.1

Mastitis (acute) (diffuse) (nonpuerperal) (subacute)3 unique routes

obstetric (interstitial) (nonpurulent)(3 variants)

purulent(3 variants)

associated with(3 variants)

lactation→O91.1

pregnancy→O91.1

puerperium→O91.1

Pregnancy (single) (uterine)1 unique routes

complicated by (care of) (management affected by)

abscess or cellulitis

breast→O91.1

Puerperal, puerperium (complicated by, complications)10 unique routes

abscess(6 variants)

breast→O91.1(2 variants)

associated with lactation→O91.1

mammary→O91.1(2 variants)

associated with lactation→O91.1

subareolar→O91.1(2 variants)

associated with lactation→O91.1

fistula(2 variants)

breast (due to mastitis)→O91.1(2 variants)

associated with lactation→O91.1

mastitis(2 variants)

purulent→O91.1(2 variants)

associated with lactation→O91.1

Suppuration, suppurative2 unique routes

mammary gland(2 variants)

puerperal, postpartum→O91.1(2 variants)

associated with lactation→O91.1

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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