O91.212 – Nonpurulent mastitis associated with pregnancy, second trimester
ICD-10-CM 2027 diagnosis code · Complications predominantly related to the puerperium
ICD-10-CM code
O91.212
- Code
O91.212(claims format:O91212)- Description
- Nonpurulent mastitis associated with pregnancy, second trimester
- Short description
- Nonpurulent mastitis assoc w pregnancy, second trimester
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 15. Pregnancy, childbirth and the puerperium (O00-O9A)
- Block
- O85-O92 Complications predominantly related to the puerperium
- Parent codes
- O91 › O91.2 › O91.21
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
O91 – Infections of breast associated with pregnancy, the puerperium and lactation
Use additional code:
- code to identify infection
O91.21 – Nonpurulent mastitis associated with pregnancy
Applicable to:
- Gestational interstitial mastitis
- Gestational lymphangitis of breast
- Gestational mastitis NOS
- Gestational parenchymatous mastitis
Block O85-O92
Related codes in O91.21
Frequently asked questions
What is ICD-10 code O91.212?
O91.212 is the ICD-10-CM code for nonpurulent mastitis associated with pregnancy, second trimester, in the block O85-O92 (Complications predominantly related to the puerperium).
Is O91.212 a billable code?
Yes. O91.212 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does O91.212 belong to?
It belongs to category O91 – Infections of breast associated with pregnancy, the puerperium and lactation.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.