Try for free

O40 ICD-10-CA category: Polyhydramnios

O40 isn’t a code on its own. Choose one of the 11 codes beneath it, the one the documentation supports.

Official description

O40

Polyhydramnios

ICD-10-CA · Canada

Codes in O40

O40 isn’t a code on its own. Open the group that matches what the note documents.

O40.01Polyhydramnios, first trimester (2 codes)O40.02Polyhydramnios, second trimester (3 codes)O40.03Polyhydramnios, third trimester (3 codes)O40.09Polyhydramnios, unspecified trimester (3 codes)

Notes for O40

As CIHI prints them, with any note O40 takes from the headings above it.

Includes

  • Hydramnios

Excludes

Conditions classified elsewhere.

  • 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 O40 sits

  1. 1ChapterChapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
  2. 2Block O30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
  3. 3Category O40Polyhydramnios

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 O40 in the CIHI source

Frequently asked questions

Is O40 a valid ICD-10-CA code?

No. O40 (Polyhydramnios) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 11 codes; record the one the documentation supports.

Where is O40 in ICD-10-CA?

O40 sits under 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 O40?

ICD-10-CA lists Includes, Note, Excludes notes for O40, 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 O40

O30Multiple gestationO31Complications specific to multiple gestationO32Maternal care for known or suspected malpresentation of fetusO33Maternal care for known or suspected disproportionO34Maternal care for known or suspected abnormality of pelvic organsO35Maternal care for known or suspected fetal abnormality and damageO36Maternal care for other known or suspected fetal problemsO37Maternal care for decreased fetal movementsO41Other disorders of amniotic fluid and membranesO42Premature rupture of membranesO43Placental disordersO44Placenta praeviaO45Premature separation of placenta [abruptio placentae]O46Antepartum haemorrhage, not elsewhere classifiedO47False labourO48Prolonged pregnancy