All ICD10 Codes

O91

Non-Billable
ChapterO00–O9A
Rankcategory
Official Description

Infections of breast associated with pregnancy, the puerperium and lactation

Use a more specific code (0 billable, 3 non-billable)
O91.0Infection of nipple associated with pregnancy, the puerperium and lactationhas subcodesO91.1Abscess of breast associated with pregnancy, the puerperium and lactationhas subcodesO91.2Nonpurulent mastitis associated with pregnancy, the puerperium and lactationhas subcodes
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 15: Pregnancy, Childbirth and the Puerperium (O00-O9A).

CH15 Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • supervision of normal pregnancy (Z34.-)
Excludes2(Not included here. Code separately if applicable.)
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)
Use Additional Code
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

O85-O92 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • puerperal osteomalacia (M83.0)

Instructional Notes

Use Additional Code
  • code to identify infection

Clinical Hierarchy

BillableHas subcodes
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 lactationNot billable
O91.0Infection of nipple associated with pregnancy, the puerperium and lactationSubcodes
O91.1Abscess of breast associated with pregnancy, the puerperium and lactationSubcodes
O91.2Nonpurulent mastitis associated with pregnancy, the puerperium and lactationSubcodes

Applicable Ancestor Context

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

blockO85-O92
Complications predominantly related to the puerperium (O85-O92)
View context instructions
chapterCH15
Pregnancy, childbirth and the puerperium (O00-O9A)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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