Try for free

O28 ICD-10-CA category: Abnormal findings on antenatal screening of mother

O28 isn’t a code on its own. Choose one of the 32 codes beneath it, the one the documentation supports.

Official description

O28

Abnormal findings on antenatal screening of mother

ICD-10-CA · Canada

Codes in O28

O28 isn’t a code on its own. Open the group that matches what the note documents.

O28.0Abnormal haematological finding on antenatal screening of mother (4 codes)O28.1Abnormal biochemical finding on antenatal screening of mother (4 codes)O28.2Abnormal cytological finding on antenatal screening of mother (4 codes)O28.3Abnormal ultrasonic finding on antenatal screening of mother (4 codes)O28.4Abnormal radiological finding on antenatal screening of mother (4 codes)O28.5Abnormal chromosomal and genetic finding on antenatal screening of mother (4 codes)O28.8Other abnormal findings on antenatal screening of mother (4 codes)O28.9Abnormal finding on antenatal screening of mother, unspecified (4 codes)

Notes for O28

As CIHI prints them, with any note O28 takes from the headings above it.

Excludes

Conditions classified elsewhere.

  • Diagnostic findings classified elsewhere - see Alphabetical Indexmaternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
  • Maternal:• care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)• diseases classifiable elsewhere but complicating pregnancy, labour and delivery, and the puerperium (O98-O99)From O20-O29 Other maternal disorders predominantly related to pregnancy
  • 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 O24.- and O25.- include the listed conditions even if they occur during childbirth or the puerperium.From O20-O29 Other maternal disorders predominantly related to pregnancy
  • 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 O28 sits

  1. 1ChapterChapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
  2. 2Block O20-O29Other maternal disorders predominantly related to pregnancy
  3. 3Category O28Abnormal findings on antenatal screening of mother

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 O28 in the CIHI source

Frequently asked questions

Is O28 a valid ICD-10-CA code?

No. O28 (Abnormal findings on antenatal screening of mother) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 32 codes; record the one the documentation supports.

Where is O28 in ICD-10-CA?

O28 sits under O20-O29 Other maternal disorders predominantly related to pregnancy, within Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99).

What coding notes apply to O28?

ICD-10-CA lists Excludes, Note notes for O28, 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 O28

O20Haemorrhage in early pregnancyO21Excessive vomiting in pregnancyO22Venous complications and haemorrhoids in pregnancyO23Infections of genitourinary tract in pregnancyO24Diabetes mellitus in pregnancyO25Malnutrition in pregnancyO26Maternal care for other conditions predominantly related to pregnancyO29Complications of anaesthesia during pregnancy