2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Abnormal findings on antenatal screening of mother
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O28: its own notes plus those printed at block O20-O29 and Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On O28 itself
  • diagnostic findings classified elsewhere - see Alphabetical Index
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block O20-O29 Other maternal disorders predominantly related to pregnancy applies to 260 codes
  • maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
  • maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Notes

General instructions on how these codes are used.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name O28, its category, or a range that includes it.

Excludes1 3

These codes carry an Excludes1 note naming O28: they are not reported together with it, unless the two conditions are unrelated.

  • Block R80-R82 Abnormal findings on examination of urine, without diagnosis
    abnormal findings on antenatal screening of mother (O28.-)
  • Block R83-R89 Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis
    abnormal findings on antenatal screening of mother (O28.-)
  • Block R90-R94 Abnormal findings on diagnostic imaging and in function studies, without diagnosis
    abnormal findings on antenatal screening of mother (O28.-)

Excludes2 3

These codes carry an Excludes2 note naming O28: its condition is not part of those codes, and both may be reported when the patient has both.

  • Chapter 18 (R00-R99) Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    abnormal findings on antenatal screening of mother (O28.-)
  • Block R70-R79 Abnormal findings on examination of blood, without diagnosis
    abnormal findings on antenatal screening of mother (O28.-)
  • Z36 Encounter for antenatal screening of mother
    abnormal findings on antenatal screening of mother (O28.-)

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O28Overview

What is the ICD-10 code for abnormal findings on antenatal screening of mother?

O28 is the ICD-10-CM category for abnormal findings on antenatal screening of mother, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.