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O34.4 vs O9A.111

O34.4 (Maternal care for other abnormalities of cervix) compared with O9A.111 (Malignant neoplasm complicating pregnancy, first trimester), from the official CMS tabular data.

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

Summary

These codes can be reported together when both conditions are documented, because O9A.111 lists O34.4 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.O34.4 is “Maternal care for other abnormalities of cervix”; O9A.111 is “Malignant neoplasm complicating pregnancy, first trimester”. O34.4 is a non-billable header; O9A.111 is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.O9A.111 lists O34.4 under Excludes2: “maternal care for benign tumor of cervix (O34.4-)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes2 relationship?

Yes.O9A.111’s tabular entry: “maternal care for benign tumor of cervix (O34.4-)”. The note covers O34.4.

Official ruleGuide: Excludes1 vs Excludes2

Is one a parent or header code?

One is a header.O34.4 is a non-billable header, but O9A.111 is not one of its subdivisions.

Registry fact

Nothing found in 3 other checks; 1 check does not apply
Is there an Excludes1 relationship?

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

Official rule

Is one more specific?

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

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

O9A.111
Malignant neoplasm complicating pregnancy, first trimester
↔
O34.4
Maternal care for other abnormalities of cervix

What we found

Yes, when both are documented.O9A.111 carries an Excludes2 note covering O34.4: “maternal care for benign tumor of cervix (O34.4-)”

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 FY2027

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

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
O34.4

Maternal care for other abnormalities of cervix

O9A.111

Malignant neoplasm complicating pregnancy, first trimester

StatusDiffers
O34.4
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: O34.40, O34.41, O34.42, O34.43

O9A.111
Billable
Excludes2Differs
O34.4

None at this code

O9A.111
  • maternal care for benign tumor of corpus uteri (O34.1-)
  • maternal care for benign tumor of cervix (O34.4-)
Code firstDiffers
O34.4
  • any associated obstructed labor (O65.5)
O9A.111

None at this code

Use additional codeDiffers
O34.4
  • code for specific condition
O9A.111
  • code to identify neoplasm
CategoryDiffers
O34.4

O34 Maternal care for abnormality of pelvic organs

O9A.111

O9A Maternal malignant neoplasms, traumatic injuries and abuse classifiable elsewhere but complicating pregnancy, childbirth and the puerperium

ChapterSame for both

O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)

IncludesDiffers
O34.4
  • the listed conditions as a reason for hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor
O9A.111

None at this code

No Excludes1, Code also and 7th character note at either code.

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. In a row that differs, each code’s own notes are listed under it, and the notes every code shares are listed once beneath them.

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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