O91.203 ICD-10-CA code: Nonpurulent mastitis associated with childbirth, antepartum condition or complication
O91.203 is the ICD-10-CA code for “Nonpurulent mastitis associated with childbirth, antepartum condition or complication” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
O91.203Nonpurulent mastitis associated with childbirth, antepartum condition or complication
Short description: Nonpurulent mastitis childbirth/antepart
ICD-10-CA · Canada · Also written O91203
Notes for O91.203
As CIHI prints them, with any note O91.203 takes from the headings above it.
Includes
- • Lymphangitis of breast gestational or puerperal• Mastitis interstitial gestational or puerperal• Mastitis NOS gestational or puerperal• Mastitis parenchymatous gestational or puerperalFrom O91.2 Nonpurulent mastitis associated with childbirth
- The listed conditions during pregnancy, the puerperium or lactationFrom O91 Infections of breast associated with childbirth
Excludes
Conditions classified elsewhere.
- Mental and behavioural disorders associated with the puerperium (F53.-)obstetrical tetanus (A34)puerperal osteomalacia (M83.0)From O85-O92 Complications predominantly related to the puerperium
- Certain diseases or injuries complicating pregnancy, childbirth, and the puerperium classified elsewhere:external causes (for mortality) (V,W,X,Y)injury, poisoning and certain other consequences of external causes (S00-T88.1, T88.6-T98)mental and behavioural disorders associated with the puerperium (F53.-)obstetrical tetanus (A34)postpartum necrosis of pituitary gland (E23.0)puerperal osteomalacia (M83.0)supervision of:• high-risk pregnancy (Z35.-)• normal pregnancy (Z34.-)From Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
Note
- Categories O88.-, O91.- and O92.- include the listed conditions even if they occur during pregnancy and childbirth.From O85-O92 Complications predominantly related to the puerperium
- The codes included in this chapter are to be used for conditions related to or aggravated by the pregnancy, childbirth or by the puerperium (maternal causes or obstetric causes)From Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
Where O91.203 sits
- 1ChapterChapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
- 2Block O85-O92Complications predominantly related to the puerperium
- 3Category O91Infections of breast associated with childbirth
- 4Subcategory O91.2Nonpurulent mastitis associated with childbirth
- 5Valid code O91.203Nonpurulent mastitis associated with childbirth, antepartum condition or complication
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code O91.203 mean?
O91.203 is the ICD-10-CA code for “Nonpurulent mastitis associated with childbirth, antepartum condition or complication” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is O91.203 in ICD-10-CA?
O91.203 sits under O91.2 Nonpurulent mastitis associated with childbirth, within O91 Infections of breast associated with childbirth, within O85-O92 Complications predominantly related to the puerperium, within Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99).
What coding notes apply to O91.203?
ICD-10-CA lists Includes, Note, Excludes notes for O91.203, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside O91.203
View O91.2O91.201Nonpurulent mastitis associated with childbirth, delivered, with or without mention of antepartum conditionO91.202Nonpurulent mastitis associated with childbirth, delivered, with mention of postpartum complicationO91.204Nonpurulent mastitis associated with childbirth, postpartum condition or complicationO91.209Nonpurulent mastitis associated with childbirth, unspecified as to episode of care, or not applicable