ICD-10-CM › O00-O9A › O85-O92 › O91.21 Nonpurulent mastitis associated... › O91.212
Nonpurulent mastitis associated with pregnancy, second trimester
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Nonpurulent mastitis associated with pregnancy, second trimester
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from O91 Infections of breast associated with pregnancy, the puerperium and lactation
Use additional code
- code to identify infection
Inherited from the O85-O92 section Complications predominantly related to the puerperium (O85-O92)
Excludes2 - not included here
- mental and behavioral disorders associated with the puerperium (F53.-)
- obstetrical tetanus (A34)
- puerperal osteomalacia (M83.0)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Adenitis
- Mammitis
- Polyadenitis
- Disease, diseased > breast
- Disorder > breast > mastitis
- Lactation, lactating > mastitis NEC
- Lymphangitis > breast > gestational
- Lymphadenitis > breast > gestational
- Infection, infected, infective > breast
- Inflammation, inflamed, inflammatory > gland
- Mastitis > interstitial, gestational or puerperal
- Infection, infected, infective > with > lymphangitis
- Inflammation, inflamed, inflammatory > lymphatic vessel
- Inflammation, inflamed, inflammatory > lymph gland or node
- Inflammation, inflamed, inflammatory > breast > puerperal, postpartum, gestational
- Mastitis > obstetric > associated with > pregnancy
Codes in the same group
| Code | Description | Status |
|---|---|---|
| O91.211 | Nonpurulent mastitis associated with pregnancy, first trimester | Valid |
| O91.213 | Nonpurulent mastitis associated with pregnancy, third trimester | Valid |
| O91.219 | Nonpurulent mastitis associated with pregnancy, unspecified trimester | Valid |