MCMedicalCodingSoftware
O91.23

O91.23: Nonpurulent mastitis associated with lactation

Billable / specific codeICD-10-CM

O91.23 is a billable, specific ICD-10-CM code for nonpurulent mastitis associated with lactation. It is valid for submission on a claim.

Check O91.23 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

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

Other codes that can never be billed with O91.23

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • N61Inflammatory disorders of breast

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

  • Puerperal, puerperium›galactophoritis›associated with lactation
  • Puerperal, puerperium›mammitis›associated with lactation
  • Puerperal, puerperium›mastitis›associated with lactation
  • Mastitis›obstetric›associated with›lactation
  • Puerperal, puerperium›lymphangitis›breast›associated with lactation

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under O91.2

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.