ICD-10-CM 2027
ICD-10 code for mastitis puerperal
Nonpurulent mastitis associated with the puerperium
From the official ICD-10-CM alphabetic index entry “Puerperal, puerperium (complicated by, complications) › mastitis”. Page updated September 29, 2026.
About coding mastitis puerperal
The ICD-10-CM code for mastitis puerperal is O91.22 (Nonpurulent mastitis associated with the puerperium). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on O91.22.
Within O91.2 (Nonpurulent mastitis associated with pregnancy, the puerperium and lactation), O91.22 is specifically for Nonpurulent mastitis associated with the puerperium. Related codes cover pregnancy (O91.21) and lactation (O91.23).
Use an additional code to identify infection.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific mastitis puerperal codes (official index)
Common questions about mastitis puerperal ICD-10 codes
What is the ICD-10 code for mastitis puerperal?
- O91.22 — Nonpurulent mastitis associated with the puerperium. More specific codes apply when the documentation supports them: O91.23, O91.12, O91.13.
What is the ICD-10 code for associated with lactation mastitis puerperal?
- O91.23 — Nonpurulent mastitis associated with lactation.
What is the ICD-10 code for purulent mastitis puerperal?
- O91.12 — Abscess of breast associated with the puerperium.
Is O91.22 billable?
- Yes. O91.22 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can O91.22 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict O91.22 as a principal diagnosis.
Is O91.22 a CC or MCC?
- No. O91.22 is neither a CC nor an MCC under MS-DRG v44.0.