O91.21
Header — not billableNonpurulent mastitis associated with pregnancy
The ICD-10 code for nonpurulent mastitis associated with pregnancy is O91.21.
O91.21 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 4 more specific codes below.
Clinical notes
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Gestational interstitial mastitis
- Gestational lymphangitis of breast
- Gestational mastitis NOS
- Gestational parenchymatous mastitis
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under O91.21
Related codes in this category
- O91.22Nonpurulent mastitis associated with the puerperium
- O91.23Nonpurulent mastitis associated with lactation
- O91.21Nonpurulent mastitis associated with pregnancynon-billable header