O00.42 vs O31.1

O00.42 (Cervical ectopic pregnancy with intrauterine pregnancy) compared with O31.1 (Continuing pregnancy after spontaneous abortion of one fetus or more), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.

Relationship

Conflict

Excludes1 conflict

O00.42

Cervical ectopic pregnancy with intrauterine pregnancy

↔

O31.1

Continuing pregnancy after spontaneous abortion of one fetus or more

Not coded here — these two are mutually exclusive.

“continuing pregnancy in multiple gestation after abortion of one fetus or more (O31.1-, O31.3-)”

An Excludes1 note means the two conditions cannot occur together, so the pair should not be reported for the same encounter. The sole exception is when the conditions are documented as unrelated to each other.

Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a

Can these codes be reported together?

No — do not report together. O00.42 carries an Excludes1 note covering O31.1: “continuing pregnancy in multiple gestation after abortion of one fetus or more (O31.1-, O31.3-)”

Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Side by side

	O00.42Cervical ectopic pregnancy with intrauterine pregnancy	O31.1Continuing pregnancy after spontaneous abortion of one fetus or more
Billing status	Billable	Non-billable header Report instead: O31.10X0, O31.10X1, O31.10X2, O31.10X3, O31.10X4
Classification	O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)	O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A)
Definition	—	Continuing pregnancy after spontaneous abortion of one fetus or more is a non-billable ICD-10-CM category code (O31.1).
7th character	—	One of the following 7th characters is to be assigned to each code under category O31. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O31 that has a 7th character of 1 through 9.
Includes	ruptured ectopic pregnancy	—
Use additional code	code from category O08 to identify any associated complication	—

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources