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O34.1 vs O9A.11

O34.1 (Maternal care for benign tumor of corpus uteri) compared with O9A.11 (Malignant neoplasm complicating pregnancy), 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 O34.1 lists O9A.11 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named.O34.1 is “Maternal care for benign tumor of corpus uteri”; O9A.11 is “Malignant neoplasm complicating pregnancy”.

Registry fact

Can these codes be reported together?

Yes, when both are documented.O34.1 lists O9A.11 under Excludes2: “maternal care for malignant neoplasm of uterus (O9A.1-)”. 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.O34.1’s tabular entry: “maternal care for malignant neoplasm of uterus (O9A.1-)”. The note covers O9A.11.

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

O34.1
Maternal care for benign tumor of corpus uteri
↔
O9A.11
Malignant neoplasm complicating pregnancy

What we found

Yes, when both are documented.O34.1 carries an Excludes2 note covering O9A.11: “maternal care for malignant neoplasm of uterus (O9A.1-)”

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
O34.1

Maternal care for benign tumor of corpus uteri

O9A.11

Malignant neoplasm complicating pregnancy

StatusDiffers
O34.1
Non-billable header

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

Report instead: O34.10, O34.11, O34.12, O34.13

O9A.11
Non-billable header

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

Report instead: O9A.111, O9A.112, O9A.113, O9A.119

Excludes2Differs
O34.1
  • maternal care for benign tumor of cervix (O34.4-)
  • maternal care for malignant neoplasm of uterus (O9A.1-)
O9A.11
  • maternal care for benign tumor of corpus uteri (O34.1-)
  • maternal care for benign tumor of cervix (O34.4-)
Code firstDiffers
O34.1
  • any associated obstructed labor (O65.5)
O9A.11

None at this code

Use additional codeDiffers
O34.1
  • code for specific condition
O9A.11
  • code to identify neoplasm
CategoryDiffers
O34.1

O34 Maternal care for abnormality of pelvic organs

O9A.11

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
O34.1
  • the listed conditions as a reason for hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor
O9A.11

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, notes every code shares are dimmed.

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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