What does ICD-10 code O28 mean?

ICD-10 code O28 is the standardized code used for abnormal findings on antenatal screening of mother in medical records and coding systems.

When is ICD-10 code O28 used?

Doctors, hospitals, and insurers may use ICD-10 code O28 when recording abnormal findings on antenatal screening of mother in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code O28 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

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

Name: ICD-10 Code O28: Abnormal findings on antenatal screening of mother
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:27:45.810Z

O28 is an ICD-10 diagnosis entry used to group records related to Abnormal findings on antenatal screening of mother. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Pregnancy, childbirth and the puerperium (O00-O9A).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Pregnancy, childbirth and the puerperium (O00-O9A).

When is it used?

May be used when a clinician documents abnormal findings on antenatal screening of mother in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

15Pregnancy, childbirth and the puerperium (O00-O9A)

block

O20-O29Other maternal disorders predominantly related to pregnancy

currentO20-O29

Official coding notes

Excludes1 (do not code together)

diagnostic findings classified elsewhere - see Alphabetical Index

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

ObstetricianGynecologist

Sibling codes

O20Hemorrhage in early pregnancy O21Excessive vomiting in pregnancy O22Venous complications and hemorrhoids in pregnancy O23Infections of genitourinary tract in pregnancy O24Diabetes mellitus in pregnancy, childbirth, and the puerperium O25Malnutrition in pregnancy, childbirth and the puerperium O26Maternal care for other conditions predominantly related to pregnancy O29Complications of anesthesia during pregnancy

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

O28

Replacement codes

O28.0 — Abnormal hematological finding on antenatal screening of motherO28.1 — Abnormal biochemical finding on antenatal screening of motherO28.2 — Abnormal cytological finding on antenatal screening of motherO28.3 — Abnormal ultrasonic finding on antenatal screening of motherO28.4 — Abnormal radiological finding on antenatal screening of motherO28.5 — Abnormal chromosomal and genetic finding on antenatal screening of motherO28.8 — Other abnormal findings on antenatal screening of motherO28.9 — Unspecified abnormal findings on antenatal screening of mother

Common synonyms

Abnormal findings on antenatal screening of mother

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.