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N39.490 vs O00

N39.490 (Overflow incontinence) compared with O00 (Ectopic pregnancy), from the official CMS tabular data.

Summary

These codes can be reported together when both conditions are documented, because N39.490 lists O00 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named, billing status and chapter.N39.490 is “Overflow incontinence”; O00 is “Ectopic pregnancy”. O00 is a non-billable header; N39.490 is billable. N39.490 sits in N00-N99 — Diseases of the Genitourinary System (N00-N99); O00 in O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A).

Registry fact

Can these codes be reported together?

Yes, when both are documented.N39.490 lists O00 under Excludes2: “abortion or ectopic or molar pregnancy (O00-O07, O08.8)”. 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. N39.490 carries 5 Excludes1 notes and O00 carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.N39.490’s tabular entry: “abortion or ectopic or molar pregnancy (O00-O07, O08.8)”. The note covers O00.

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?

One is a header.O00 is a non-billable header, but N39.490 is not one of its subdivisions.

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

N39.490
Overflow incontinence
↔
O00
Ectopic pregnancy

What we found

Yes, when both are documented.N39.490 carries an Excludes2 note covering O00: “abortion or ectopic or molar pregnancy (O00-O07, O08.8)”

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

N39.490Overflow incontinenceO00Ectopic pregnancy
Billing statusBillableNon-billable header

Report instead: O00.00, O00.01, O00.101, O00.102, O00.109

ClassificationN00-N99 — Diseases of the Genitourinary System (N00-N99)O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)
DefinitionOverflow incontinence is a billable ICD-10-CM diagnosis code (N39.490).Ectopic pregnancy is a non-billable ICD-10-CM category code (O00).
Includes—
ruptured ectopic pregnancy
Excludes1
enuresis NOS (R32)
functional urinary incontinence (R39.81)
urinary incontinence associated with cognitive impairment (R39.81)
urinary incontinence NOS (R32)
urinary incontinence of nonorganic origin (F98.0)
continuing pregnancy in multiple gestation after abortion of one fetus or more (O31.1-, O31.3-)
Excludes2
hematuria NOS (R31.-)
recurrent or persistent hematuria (N02.-)
recurrent or persistent hematuria with specified morphological lesion (N02.-)
proteinuria NOS (R80.-)
urinary infection (complicating):
abortion or ectopic or molar pregnancy (O00-O07, O08.8)
pregnancy, childbirth and the puerperium (O23.-, O75.3, O86.2-)
—
Use additional code—
code from category O08 to identify any associated complication
Code also
any associated overactive bladder (N32.81)
—

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.

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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