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O20-O29 vs O48

O20-O29 (Other maternal disorders predominantly related to pregnancy (O20-O29)) compared with O48 (Late pregnancy), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because O20-O29 lists O48 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named.O20-O29 is “Other maternal disorders predominantly related to pregnancy (O20-O29)”; O48 is “Late pregnancy”.

Registry fact

Can these codes be reported together?

Yes, when both are documented.O20-O29 lists O48 under Excludes2: “maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code.

Official rule

Is there an Excludes2 relationship?

Yes.O20-O29’s tabular entry: “maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)”. The note covers O48.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

Both are headers.Both are non-billable headers, and neither contains the other.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

O20-O29
Other maternal disorders predominantly related to pregnancy (O20-O29)
↔
O48
Late pregnancy

What we found

Yes, when both are documented.O20-O29 carries an Excludes2 note covering O48: “maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2026

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

O20-O29Other maternal disorders predominantly related to pregnancy (O20-O29)O48Late pregnancy
Billing statusNon-billable headerNon-billable header

Report instead: O48.0, O48.1

ClassificationO00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)
DefinitionOther maternal disorders predominantly related to pregnancy (O20-O29) is a non-billable ICD-10-CM category code (O20-O29).Late pregnancy is a non-billable ICD-10-CM category code (O48).
Excludes2
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)
—

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.

Edit this comparisonCheck a whole claim

Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources