O20.0 — Threatened abortion

O20.0

ICD-10 Chapter 15: Pregnancy, Childbirth & Puerperium — illustrative image — Chapter 15: Pregnancy, childbirth and the puerperium (O00–O9A) — illustrative image

What this code means

Threatened abortion is vaginal bleeding in early pregnancy with a closed cervix, where the pregnancy may continue.

Also called: threatened abortion, threatened miscarriage.

When this code is used

Used for threatened abortion.

Where it sits in ICD-10-CM

Code O20.0 belongs to Chapter 15: Pregnancy, childbirth and the puerperium, which covers codes O00–O9A in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Learn more about this condition

Condition guide: Pregnancy

Frequently asked questions

What is ICD-10-CM code O20.0?

O20.0 is the ICD-10-CM diagnosis code for “Threatened abortion”. Threatened abortion is vaginal bleeding in early pregnancy with a closed cervix, where the pregnancy may continue.

When is code O20.0 used?

Used for threatened abortion. It belongs to Chapter 15 of ICD-10-CM (Pregnancy, childbirth and the puerperium).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.