ICD-10-CM O91: Infections of breast associated with pregnancy, the puerperium and lactation

ICD-10-CM Diagnosis Code (2025)

Official Description for O91

Infections of breast associated with pregnancy, the puerperium and lactation

Coding Notes & Guidelines for O91

Use Additional Code

code to identify infection

Inclusion Terms

Gestational abscess of nipple

Inclusion Terms

Puerperal abscess of nipple

Inclusion Terms

Abscess of nipple associated with lactation

Inclusion Terms
  • Gestational mammary abscess
  • Gestational purulent mastitis
  • Gestational subareolar abscess
Inclusion Terms
  • Puerperal mammary abscess
  • Puerperal purulent mastitis
  • Puerperal subareolar abscess
Inclusion Terms
  • Mammary abscess associated with lactation
  • Purulent mastitis associated with lactation
  • Subareolar abscess associated with lactation
Inclusion Terms
  • Gestational interstitial mastitis
  • Gestational lymphangitis of breast
  • Gestational mastitis NOS
  • Gestational parenchymatous mastitis
Inclusion Terms
  • Puerperal interstitial mastitis
  • Puerperal lymphangitis of breast
  • Puerperal mastitis NOS
  • Puerperal parenchymatous mastitis
Inclusion Terms
  • Interstitial mastitis associated with lactation
  • Lymphangitis of breast associated with lactation
  • Mastitis NOS associated with lactation
  • Parenchymatous mastitis associated with lactation

Child Codes (More Specific Codes for O91):

O91.0 - Infection of nipple associated with pregnancy, the puerperium and lactation O91.01 - Infection of nipple associated with pregnancy O91.011 - Infection of nipple associated with pregnancy, first trimester O91.012 - Infection of nipple associated with pregnancy, second trimester O91.013 - Infection of nipple associated with pregnancy, third trimester O91.019 - Infection of nipple associated with pregnancy, unspecified trimester O91.02 - Infection of nipple associated with the puerperium O91.03 - Infection of nipple associated with lactation O91.1 - Abscess of breast associated with pregnancy, the puerperium and lactation O91.11 - Abscess of breast associated with pregnancy O91.111 - Abscess of breast associated with pregnancy, first trimester O91.112 - Abscess of breast associated with pregnancy, second trimester O91.113 - Abscess of breast associated with pregnancy, third trimester O91.119 - Abscess of breast associated with pregnancy, unspecified trimester O91.12 - Abscess of breast associated with the puerperium O91.13 - Abscess of breast associated with lactation O91.2 - Nonpurulent mastitis associated with pregnancy, the puerperium and lactation O91.21 - Nonpurulent mastitis associated with pregnancy O91.211 - Nonpurulent mastitis associated with pregnancy, first trimester O91.212 - Nonpurulent mastitis associated with pregnancy, second trimester O91.213 - Nonpurulent mastitis associated with pregnancy, third trimester O91.219 - Nonpurulent mastitis associated with pregnancy, unspecified trimester O91.22 - Nonpurulent mastitis associated with the puerperium O91.23 - Nonpurulent mastitis associated with lactation

About ICD-10-CM Code O91 (Infections of breast associated with pregnancy)

ICD-10-CM code O91 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM O91 became effective on October 1, 2024.

This page provides detailed information about O91 - Infections of breast associated with pregnancy, the puerperium and lactation. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Infections of breast associated with pregnancy related to the puerperium and lactation.