O91Header code — not billable
Infections of breast associated with pregnancy, the puerperium and lactation
Short description: Infect of breast assoc w pregnancy, the puerp and lactation
- Chapter
- 15. Pregnancy, childbirth and the puerperium
- Category
- O91
- Effective date
- October 1, 2026
Related codes in category O91
O91.0Infct of nipple assoc w pregnancy, the puerp and lactationO91.01Infection of nipple associated with pregnancyO91.011Infection of nipple associated w pregnancy, first trimesterYesO91.012Infection of nipple associated w pregnancy, second trimesterYesO91.013Infection of nipple associated w pregnancy, third trimesterYesO91.019Infection of nipple associated w pregnancy, unsp trimesterYesO91.02Infection of nipple associated with the puerperiumYesO91.03Infection of nipple associated with lactationYesO91.1Abscess of breast assoc w pregnancy, the puerp and lactationO91.11Abscess of breast associated with pregnancyO91.111Abscess of breast associated with pregnancy, first trimesterYesO91.112Abscess of breast associated w pregnancy, second trimesterYes
Frequently asked questions
What is ICD-10 code O91?
O91 is an ICD-10-CM diagnosis code for Infections of breast associated with pregnancy, the puerperium and lactation.
Is O91 a billable code?
No. O91 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is O91 in?
O91 falls under Chapter 15: Pregnancy, childbirth and the puerperium.
When did O91 become effective?
O91 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to O91?
O91 belongs to category O91, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.