O00.20 Ovarian pregnancy without intrauterine pregnancy

ICD-10-CM Code O00.20: Ovarian pregnancy without intrauterine pregnancy

ICD-10-CM code O00.20 designates an ovarian pregnancy without an intrauterine pregnancy as an active diagnosis concept. It falls under the parent category of ovarian pregnancy. Clinical evaluation of ectopic pregnancies involves differentiating them from conditions with similar features, such as miscarriage or appendicitis. 1 2

Plain-language overview

Code O00.20 identifies an ovarian pregnancy without an intrauterine pregnancy, and clinical texts note that differentiating ectopic pregnancies from conditions with similar features can be difficult. 1 2

Clinical signs of an ectopic pregnancy can include lower abdominal pain and vaginal bleeding in early pregnancy, which can mimic other conditions like early normal intrauterine pregnancy, miscarriage, ovarian cyst rupture, or appendicitis. 2

What this code represents

The code O00.20 is an active terminology record classified as a disease or syndrome, and it does not have narrower concepts under its specific hierarchy within the ICD-10-CM version 2026. 1

The terminology record for O00.20 lists O00.2, ovarian pregnancy, as its parent concept, establishing the direct hierarchical relationship for this specific diagnosis code. 1

Coding details

While O00.20 has no narrower concepts, a related coding domain entry identifies O00.201 as a right ovarian pregnancy without intrauterine pregnancy within chapter fifteen. 1 3

Documentation considerations

Clinical documentation for an ovarian ectopic pregnancy may reference Spiegelberg histology criteria, which are frequently used to differentiate this specific ectopic type from other ectopic implantation locations. 2

Medical records might note that a beta-hCG level exceeding 2000 mIU/mL without visualization of an intrauterine pregnancy is highly suggestive of an ectopic pregnancy, aiding clinical documentation. 2

What the sources add

While the terminology record defines the code structure, the clinical text adds that differentiating ectopic pregnancies from conditions with similar features can be difficult, making prompt medical evaluation crucial for accurate diagnosis. 1 2

Sources

1. ICD-10-CM O00.20 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. ICD-10 | Right ovarian pregnancy without intrauterine pregnancy (O00.201) — cdek.pharmacy.purdue.edu; accessed 2026-07-27.