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O28.1 ICD-10-CA subcategory: Abnormal biochemical finding on antenatal screening of mother

O28.1 isn’t a code on its own. Choose one of the 4 codes beneath it, the one the documentation supports.

Official description

O28.1

Abnormal biochemical finding on antenatal screening of mother

ICD-10-CA · Canada · Also written O281

Codes in O28.1

O28.1 isn’t a code on its own. Open the code that matches what the note documents.

O28.101Abnormal biochemical finding on antenatal screening of mother, delivered, with or without mention of antepartum conditionO28.102Abnormal biochemical finding on antenatal screening of mother, delivered, with mention of postpartum complicationO28.103Abnormal biochemical finding on antenatal screening of mother, antepartum condition or complicationO28.109Abnormal biochemical finding on antenatal screening of mother, unspecified as to episode of care, or not applicable

Notes for O28.1

As CIHI prints them, with any note O28.1 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)From O28 Abnormal findings on antenatal screening of mother
  • 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 O28.1 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
  4. 4Subcategory O28.1Abnormal biochemical finding 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 O28.1 in the CIHI source

Frequently asked questions

Is O28.1 a valid ICD-10-CA code?

No. O28.1 (Abnormal biochemical finding on antenatal screening of mother) is a subcategory heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 4 codes; record the one the documentation supports.

Where is O28.1 in ICD-10-CA?

O28.1 sits under O28 Abnormal findings on antenatal screening of mother, within O20-O29 Other maternal disorders predominantly related to pregnancy, within Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99).

What coding notes apply to O28.1?

ICD-10-CA lists Excludes, Note notes for O28.1, 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.

Codes beside O28.1

O28.0Abnormal haematological finding on antenatal screening of motherO28.2Abnormal cytological finding on antenatal screening of motherO28.3Abnormal ultrasonic finding on antenatal screening of motherO28.4Abnormal radiological finding on antenatal screening of motherO28.5Abnormal chromosomal and genetic finding on antenatal screening of motherO28.8Other abnormal findings on antenatal screening of motherO28.9Abnormal finding on antenatal screening of mother, unspecified