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O28.0 ICD-10-CM Code: Abnormal hematological finding on antenatal screening of mother

Compare with another code for O28.0Check this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 Excludes1 · 2 Excludes2

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too, and is marked with where it comes from.

Excludes1from O28Not reported with this code unless documented as unrelated
  • diagnostic findings classified elsewhere - see Alphabetical Index
Excludes2from O20-O29Not included here; may be reported together
  • 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)

Where it sits Source: CMS/NCHS

Under:Chapter 15: Pregnancy, Childbirth and the PuerperiumO20-O29 Other maternal disorders predominantly related to pregnancyO28 Abnormal findings on antenatal screening of mother

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Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 817 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITH MCC (MDC 14)
  • MS-DRG 818 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITH CC (MDC 14)
  • MS-DRG 819 — OTHER ANTEPARTUM DIAGNOSES WITH O.R. PROCEDURES WITHOUT CC/MCC (MDC 14)
  • MS-DRG 831 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITH MCC (MDC 14)
  • MS-DRG 832 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITH CC (MDC 14)
  • MS-DRG 833 — OTHER ANTEPARTUM DIAGNOSES WITHOUT O.R. PROCEDURES WITHOUT CC/MCC (MDC 14)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for O28.0 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on O28.0 itself; “inherited from” names the category or block whose note applies here.

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

  • diagnostic findings classified elsewhere - see Alphabetical Index

Source: inherited from O28

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from O20-O29

Coder workflow for O28.0

MedCoder structured workflow — derived from this code’s own official record

Before you code O28.0

  1. Confirm the condition is documented as complicating the pregnancy, childbirth, or the puerperium, and check the trimester where the code carries one and the fetus character where the category requires it. Chapter 15 codes belong on the maternal record only and take sequencing priority over codes from other chapters. It is the provider’s responsibility to state that a condition is not affecting the pregnancy; the trimester is assigned from the documentation (Guidelines I.C.15.a, I.C.15.a.1, I.C.15.a.3).

    Guide: How to choose an ICD-10-CM code →

  2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with O28.0. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in O28.0’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

Consider O28.0. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Trimester
Assigned from the documented trimester at the encounter, or the trimester in which the condition developed for inpatient stays (Guidelines I.C.15.a.3).

Official instructions as workflow

  • Excludes1 — check before selecting O28.0(1 note)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with O28.0: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    See the official tabular notes · Guidelines I.A.12.a

  • Excludes2 — not part of O28.0(2 notes)

    Coding workflow: The conditions named in this note are not included in O28.0. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition O28.0 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse O28.0 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of O28.0 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • O28.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Unspecified abnormal findings on antenatal screening of mother” takes O28.9; specificity in the record moves it back here.

    Full comparison: O28.0 vs O28.9 →

  • O30— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of maternal care related to the fetus and amniotic cavity and possible delivery problems adds O30; it is not part of this code and both may be reported when both are documented.

    Full comparison: O28.0 vs O30 →

  • O48— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of maternal care related to the fetus and amniotic cavity and possible delivery problems adds O48; it is not part of this code and both may be reported when both are documented.

    Full comparison: O28.0 vs O48 →

  • O98— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium adds O98; it is not part of this code and both may be reported when both are documented.

    Full comparison: O28.0 vs O98 →

  • O99— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium adds O99; it is not part of this code and both may be reported when both are documented.

    Full comparison: O28.0 vs O99 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Abnormal hematological finding on antenatal screening of mother is a billable ICD-10-CM diagnosis code (O28.0).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Verify Before Coding

  • Age-restricted: the Medicare Code Editor lists this as a maternity (age 9-64) diagnosis; other ages are presumed incorrect.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name O28.0 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 18 Excludes1 notes: R80 — Proteinuria (via O28.-), R80-R82 — Abnormal findings on examination of urine, without diagnosis (R80-R82) (via O28.-), R81 — Glycosuria (via O28.-), R82 — Other and unspecified abnormal findings in urine (via O28.-), R83 — Abnormal findings in cerebrospinal fluid (via O28.-), R83-R89 — Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis (R83-R89) (via O28.-), R84 — Abnormal findings in specimens from respiratory organs and thorax (via O28.-), R85 — Abnormal findings in specimens from digestive organs and abdominal cavity (via O28.-), R86 — Abnormal findings in specimens from male genital organs (via O28.-), R87 — Abnormal findings in specimens from female genital organs (via O28.-), R88 — Abnormal findings in other body fluids and substances (via O28.-), R89 — Abnormal findings in specimens from other organs, systems and tissues (via O28.-), R90 — Abnormal findings on diagnostic imaging of central nervous system (via O28.-), R90-R94 — Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94) (via O28.-), R91 — Abnormal findings on diagnostic imaging of lung (via O28.-), R92 — Abnormal and inconclusive findings on diagnostic imaging of breast (via O28.-), R93 — Abnormal findings on diagnostic imaging of other body structures (via O28.-), R94 — Abnormal results of function studies (via O28.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 11 Excludes2 notes across 2 chapters: R70 — Elevated erythrocyte sedimentation rate and abnormality of plasma viscosity (via O28.-), R70-R79 — Abnormal findings on examination of blood, without diagnosis (R70-R79) (via O28.-), R71 — Abnormality of red blood cells (via O28.-), R73 — Elevated blood glucose level (via O28.-), R74 — Abnormal serum enzyme levels (via O28.-), R75 — Inconclusive laboratory evidence of human immunodeficiency virus [HIV] (via O28.-), R76 — Other abnormal immunological findings in serum (via O28.-), R77 — Other abnormalities of plasma proteins (via O28.-), R78 — Findings of drugs and other substances, not normally found in blood (via O28.-), R79 — Other abnormal findings of blood chemistry (via O28.-), Z36 — Encounter for antenatal screening of mother (via O28.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 6 MS-DRGs: DRG 817 (MDC 14), DRG 818 (MDC 14), DRG 819 (MDC 14), DRG 831 (MDC 14), DRG 832 (MDC 14), DRG 833 (MDC 14).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):PRG028 — Other specified complications in pregnancy (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified complications in pregnancy).

+318 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Findings, abnormal, inconclusive, without diagnosis”; these codes share that main term but sit in a different category of the Tabular List.

E16.2 — Hypoglycemia, unspecified (blood sugar, low), E78.00 — Pure hypercholesterolemia, unspecified (cholesterol, high), E78.1 — Pure hyperglyceridemia (triglycerides, high), E78.2 — Mixed hyperlipidemia (triglycerides, high, with high cholesterol), E78.9 — Disorder of lipoprotein metabolism, unspecified (cholesterol), E87.0 — Hyperosmolality and hypernatremia (sodium, excess), E87.1 — Hypo-osmolality and hyponatremia (sodium), E87.5 — Hyperkalemia (potassium, excess), E87.6 — Hypokalemia (potassium), E87.8 — Other disorders of electrolyte and fluid balance, not elsewhere classified (chloride), R01.2 — Other cardiac sounds (heart, sounds), R70.0 — Elevated erythrocyte sedimentation rate (sedimentation rate, elevated), R71.0 — Precipitous drop in hematocrit (hematocrit drop), R71.8 — Other abnormality of red blood cells (anisocytosis), R73.09 — Other abnormal glucose (glucose), R73.9 — Hyperglycemia, unspecified (blood sugar, high), R74.01 — Elevation of levels of liver transaminase levels (SGPT), R74.02 — Elevation of levels of lactic acid dehydrogenase [LDH] (lactic acid dehydrogenase), R76.0 — Raised antibody titer (antibody titer, elevated), R76.11 — Nonspecific reaction to tuberculin skin test without active tuberculosis (PPD), +55 more

Contextual Map

Every relationship of O28.0 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run O28.0 with these 16 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes (18)

Referenced by Excludes2 notes (11)

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 14 — Pregnancy, Childbirth and the Puerperium[MDC crossing]: “Pregnancy, Childbirth and the Puerperium — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 94 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Findings, abnormal, inconclusive, without diagnosis, antenatal screening of mother, hematological[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Pregnancy (single) (uterine), complicated by (care of) (management affected by), abnormal, abnormality, findings on antenatal screening of mother, hematological[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (2)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "O28.0 — Abnormal hematological finding on antenatal screening of mother." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/o28.0-abnormal-hematological-finding-on-antenatal-screening-of-mother

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Abnormal hematological finding on antenatal screening of mother

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to O28.0 in its code family, with their registry titles.

View all codes in the O28 family