O33.1 ICD-10-CA subcategory: Maternal care for disproportion due to generally contracted pelvis

O33.1 isn’t a code on its own. Choose one of the 3 codes beneath it, the one the documentation supports.

Official description

O33.1

Maternal care for disproportion due to generally contracted pelvis

ICD-10-CA · Canada · Also written O331

Codes in O33.1

O33.1 isn’t a code on its own. Open the code that matches what the note documents.

O33.101Maternal care for disproportion due to generally contracted pelvis, delivered, with or without mention of antepartum condition O33.103Maternal care for disproportion due to generally contracted pelvis, antepartum condition or complication O33.109Maternal care for disproportion due to generally contracted pelvis, unspecified as to episode of care, or not applicable

Notes for O33.1

As CIHI prints them, with any note O33.1 takes from the headings above it.

Includes

• Contracted pelvis NOS causing disproportion
The listed conditions as a reason for observation, hospitalization or other obstetric care of the mother, or for caesarean section before onset of labourFrom O33 Maternal care for known or suspected disproportion

Excludes

Conditions classified elsewhere.

The listed conditions with obstructed labour (O65-O66)From O33 Maternal care for known or suspected disproportion
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

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 O33.1 sits

1ChapterChapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
2Block O30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
3Category O33Maternal care for known or suspected disproportion
4Subcategory O33.1Maternal care for disproportion due to generally contracted pelvis

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.

See O33.1 in the CIHI source

Frequently asked questions

Is O33.1 a valid ICD-10-CA code?

No. O33.1 (Maternal care for disproportion due to generally contracted pelvis) is a subcategory heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 3 codes; record the one the documentation supports.

Where is O33.1 in ICD-10-CA?

O33.1 sits under O33 Maternal care for known or suspected disproportion, within O30-O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems, within Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99).

What coding notes apply to O33.1?

ICD-10-CA lists Includes, Excludes, Note notes for O33.1, 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.

View O33