O20.0 Threatened abortion

The ICD-10-CM code for Threatened abortion is O20.0 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

15: Pregnancy, childbirth and the puerperium (O00-O9A)

Section

O20-O29: Other maternal disorders predominantly related to pregnancy (O20-O29)

Category O20

4 codes (3 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to O20.0:

• Abortion (complete) (spontaneous) › threatened (spontaneous)
• Threatened › abortion
• Threatened › miscarriage
• Abortion (complete) (spontaneous) › spontaneous › threatened
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › threatened › abortion
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › hemorrhage › threatened abortion
• Hemorrhage, hemorrhagic (concealed) › antepartum (with) › before 20 weeks gestation › threatened abortion

Inclusion Terms

• Hemorrhage specified as due to threatened abortion

U.S. Hospital Utilization

• An estimated 845 U.S. inpatient stays in 2023 included O20.0 among the documented diagnoses.
• 350 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)