O20.0

Threatened abortion

Billable FY2026 2025-10-01 → 2026-09-30

Exclusions 8 never code together

O20code

Excludes1

pregnancy with abortive outcome (O00-O08)O00-O08

O20-O29block

Excludes2

maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)O30-O48
maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)O98-O99

O00-O9Achapter

Excludes1

supervision of normal pregnancy (Z34.-)Z34.-

Excludes2

mental and behavioral disorders associated with the puerperium (F53.-)F53.-
obstetrical tetanus (A34)A34
postpartum necrosis of pituitary gland (E23.0)E23.0
puerperal osteomalacia (M83.0)M83.0

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 9

O20.0code

Inclusion terms

Hemorrhage specified as due to threatened abortion

O20code

Includes

hemorrhage before completion of 20 weeks gestation

O00-O9Achapter

Notes

CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
1st trimester- less than 14 weeks 0 days
2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
3rd trimester- 28 weeks 0 days until delivery

Use additional code

code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.Z3A

Index entries leading here 4

Threatened
- abortion O20.0
- miscarriage O20.0
Pregnancy (single) (uterine) Z33.1
- complicated by (care of) (management affected by)
  - threatened
    - abortion O20.0
  - hemorrhage
    - threatened abortion O20.0
Abortion (complete) (spontaneous) O03.9
- threatened (spontaneous) O20.0
- spontaneous — see Abortion (complete) (spontaneous)
  - threatened O20.0
Hemorrhage, hemorrhagic (concealed) R58
- antepartum (with) O46.90
  - before 20 weeks gestation O20.9
    - threatened abortion O20.0

Alongside this code 2 same parent — O20

O20.8 Other hemorrhage in early pregnancy O20.9 Hemorrhage in early pregnancy, unspecified

Medications 1

20 Abortion, Threatened drugs

MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable: yes
Code set: FY2026
Parent: O20
Block: O20-O29
Siblings: 2

Present FY2024–FY2027.