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v1.0.0
ICD-10 Guide
DiagnosesThreatened Abortion

Threatened Abortion

ICD-10 Coding for Threatened Abortion(O20.0, O20.9)

PRIMARY SPECIALTYObstetrics
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Threatened Abortion?
Essential facts and insights about Threatened Abortion

Key Clinical Considerations:

  • Vaginal bleeding in early pregnancy
  • Cervical os is closed
  • Presence of fetal heartbeat on ultrasound

Clinical Information

Clinical Criteria & Documentation Requirements

  • Date of onset of bleeding
  • Gestational age at presentation
  • Details of ultrasound findings

Coding Guidelines

Usage Guidelines & Examples

  • Ensure correct use of O20.0 for threatened abortion versus other pregnancy complications.
  • Common errors include misclassifying as complete or inevitable abortion.

Code Exclusions

Important Exclusions

  • Complete abortion (O03.9)
  • Inevitable abortion (O20.1)

Related ICD-10 Codes

Primary Codes
O20.0
Threatened abortion
Ancillary Codes
O20.9
Differential Codes
O03.9

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Obstetrics

Specialty Applications

  • Pregnant patients in the first trimester
  • Emergency and outpatient obstetric settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Document the nature and duration of bleeding, any associated symptoms, and ultrasound findings.

Billing considerations?

Ensure accurate coding to reflect the diagnosis and any associated procedures performed.