ICD-10-CM 2027 diagnosis code

O91.01Infection of nipple associated with pregnancy

Not billable — use a more specific code

O91.01 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O91.01

O91.01 is the ICD-10-CM diagnosis code for infection of nipple associated with pregnancy. It belongs to category O91 (infections of breast associated with pregnancy, the puerperium and lactation), block O85-O92 (complications predominantly related to the puerperium) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within O91.0 (infection of nipple associated with pregnancy, the puerperium and lactation), O91.01 is specifically for infection of nipple associated with pregnancy. Related codes cover the puerperium (O91.02) and lactation (O91.03).

To report this condition, pick the subcode that matches the documentation: O91.011 (first trimester), O91.012 (second trimester), O91.013 (third trimester) and O91.019 (unspecified trimester).

Use an additional code to identify infection.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under O91.01

Coding notes

Applicable toConditions and synonyms classified to this code

Gestational abscess of nipple

Notes that apply from higher levels

Instructions written at a parent level also apply to O91.01.

› From O91 Infections of breast associated with pregnancy, the puerperium and lactation

Use additional code

code to identify infection

Broader instructions also apply from O85-O92 Complications predominantly related to the puerperium and Chapter 15: Pregnancy, childbirth and the puerperium.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to O91.01.

Code history

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2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about O91.01

Is O91.01 billable?: No. O91.01 is a header code. Report one of its more specific subcodes instead.