Alphabetic Index FY2027

O03

Spontaneous abortion

FY2027Chapter 15: Pregnancy, childbirth and the puerperium/O00–O08 Pregnancy with abortive outcome

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

O03 is a non-billable ICD-10-CM code category for spontaneous abortion. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are O03.0 Genital tract and pelvic infection following incomplete spontaneous abortion, O03.1 Delayed or excessive hemorrhage following incomplete spontaneous abortion, O03.2 Embolism following incomplete spontaneous abortion, O03.3 Other and unspecified complications following incomplete spontaneous abortion and 6 more. Its coding notes include a Use additional code instruction, 2 Excludes1 entries and 4 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

The trimester character comes from the provider's documentation for the current encounter. The unspecified trimester code should rarely be used.

Guidelines I.C.15.a.3; I.C.15.a.5Pregnancy: the trimester characterRead the official text

Use additional code

Add the listed code as a secondary code, if known.

Also from chapter/block level (1 note)
Inherited from Chapter 15 Pregnancy, childbirth and the puerperium
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Also from chapter/block level (2 notes)
Inherited from O00–O08 Pregnancy with abortive outcome
  • continuing pregnancy in multiple gestation after abortion of one fetus or more (O31.1-, O31.3-)
Inherited from Chapter 15 Pregnancy, childbirth and the puerperium
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Also from chapter/block level (4 notes)
Inherited from Chapter 15 Pregnancy, childbirth and the puerperium
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Includes

Further defines or gives examples of the content of the category.

This code
  • miscarriage

Notes

This code
  • Incomplete abortion includes retained products of conception following spontaneous abortion
Also from chapter/block level (6 notes)
Inherited from Chapter 15 Pregnancy, childbirth and the puerperium
  • 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

More specific codes under O03 10