2026 ICD-10-CM Diagnosis Code O28Abnormal findings on antenatal screening of mother

ICD-10-CM Codes›O00-O9A›O20-O29›O28

ICD-10-CM O28
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

O28 is a non-billable ICD-10-CM category code for abnormal findings on antenatal screening of mother, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O28.0, O28.1, O28.2, and O28.3.

Code Identity

ICD-10-CM Code
O28
Billable Status
No — Non-Billable Category
Code Describes
Abnormal findings on antenatal screening of mother
Chapter
O20-O29
Other maternal disorders predominantly related to pregnancy

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO20-O29Other maternal disorders predominantly related to pregnancy
CategoryO28Abnormal findings on antenatal screening of mother
This CodeO28Abnormal findings on antenatal screening of mother

Specific Coding for Abnormal findings on antenatal screening of motherOverview

Non-specific codes like O28 require more characters. Use one of these billable codes instead:

  • Use O28.0 for Abnormal hematological finding on antenatal screening of mother

  • Use O28.1 for Abnormal biochemical finding on antenatal screening of mother

  • Use O28.2 for Abnormal cytological finding on antenatal screening of mother

  • Use O28.3 for Abnormal ultrasonic finding on antenatal screening of mother

  • Use O28.4 for Abnormal radiological finding on antenatal screening of mother

  • Use O28.5 for Abnormal chromosomal and genetic finding on antenatal screening of mother

  • Use O28.8 for Other abnormal findings on antenatal screening of mother

  • Use O28.9 for Unspecified abnormal findings on antenatal screening of mother

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Type 1 Excludes

  • diagnostic findings classified elsewhere - see Alphabetical Index

Patient EducationClinical

Health Problems in Pregnancy

A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.

The full article covers:

  • What are health problems in pregnancy?
  • What raises my risk for health problems during pregnancy?
  • Can chronic health conditions cause problems in pregnancy?
  • Can health problems in pregnancy be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About O28Overview

Is O28 (Abnormal findings on antenatal screening of mother) a billable code?

No. This is a category header that groups the codes for abnormal findings on antenatal screening of mother, and headers cannot be submitted on claims. Claims for abnormal findings on antenatal screening of mother need a more specific code from this category, such as O28.0, O28.1, and O28.2.