Is O91 a billable code?
No. O91 is a header code that groups 18 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
O91: Infections of breast associated with pregnancy, the puerperium and lactation
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
O91 groups related diagnoses under infections of breast associated with pregnancy, the puerperium and lactation. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under O91
- O91.011Infection of nipple associated with pregnancy, first trimester
- O91.012Infection of nipple associated with pregnancy, second trimester
- O91.013Infection of nipple associated with pregnancy, third trimester
- O91.019Infection of nipple associated with pregnancy, unspecified trimester
- O91.02Infection of nipple associated with the puerperium
- O91.03Infection of nipple associated with lactation
- O91.111Abscess of breast associated with pregnancy, first trimester
- O91.112Abscess of breast associated with pregnancy, second trimester
- O91.113Abscess of breast associated with pregnancy, third trimester
- O91.119Abscess of breast associated with pregnancy, unspecified trimester
- O91.12Abscess of breast associated with the puerperium
- O91.13Abscess of breast associated with lactation
- O91.211Nonpurulent mastitis associated with pregnancy, first trimester
- O91.212Nonpurulent mastitis associated with pregnancy, second trimester
- O91.213Nonpurulent mastitis associated with pregnancy, third trimester
- O91.219Nonpurulent mastitis associated with pregnancy, unspecified trimester
- O91.22Nonpurulent mastitis associated with the puerperium
- O91.23Nonpurulent mastitis associated with lactation
O91 questions
What does O91 mean?
O91 is the ICD-10-CM code for Infections of breast associated with pregnancy, the puerperium and lactation. It is in chapter 15, Pregnancy, childbirth and the puerperium (O00-O9A).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.