O91.23 Nonpurulent mastitis associated with lactation

✓ Billable ICD-10-CM 2026
Open O91.23 in Web App →

The ICD-10-CM code for Nonpurulent mastitis associated with lactation is O91.23 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
O85-O92: Complications predominantly related to the puerperium (O85-O92)
Category O91
25 codes (18 billable)
FY2026 Status
Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to O91.23:

  • Puerperal, puerperium (complicated by, complications) › mammitis › associated with lactation
  • Puerperal, puerperium (complicated by, complications) › galactophoritis › associated with lactation
  • Puerperal, puerperium (complicated by, complications) › mastitis › associated with lactation
  • Puerperal, puerperium (complicated by, complications) › lymphangitis › breast › associated with lactation
  • Mastitis (acute) (diffuse) (nonpuerperal) (subacute) › obstetric (interstitial) (nonpurulent) › associated with › lactation

Inclusion Terms

  • Interstitial mastitis associated with lactation
  • Lymphangitis of breast associated with lactation
  • Mastitis NOS associated with lactation
  • Parenchymatous mastitis associated with lactation

U.S. Hospital Utilization

  • An estimated 355 U.S. inpatient stays in 2023 included O91.23 among the documented diagnoses.
  • 160 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

References

Related Codes

Parent Code

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

Related Codes in O91

O91 Infections of breast associated with pregnancy, the puerperium and lactation 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
Search all 70,000+ ICD-10-CM codes →
Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

Get HCC Mappings, Clinical Summaries, and More

Access premium features including HCC risk adjustment, FDA drug indications, AI coding assistant, and comprehensive clinical context.

Start Free Trial