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ICD-10-CM 2027 diagnosis code

O03.4Incomplete spontaneous abortion without complication

✓ Billable / specificMaternity · age 9–64Female only

O03.4 is a valid, billable ICD-10-CM code for incomplete spontaneous abortion without complication. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Incomplete spontaneous abortion.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O03.4

O03.4 is the ICD-10-CM diagnosis code for incomplete spontaneous abortion without complication. It belongs to category O03 (spontaneous abortion), block O00-O08 (pregnancy with abortive outcome) and chapter 15 (pregnancy, childbirth and the puerperium). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within O03, choose O03.4 (Incomplete spontaneous abortion without complication) only when documentation doesn't support a more specific option: genital tract and pelvic infection following incomplete spontaneous abortion (O03.0), delayed or excessive hemorrhage following incomplete spontaneous abortion (O03.1), embolism following incomplete spontaneous abortion (O03.2), other and unspecified complications following incomplete spontaneous abortion (O03.3), genital tract and pelvic infection following complete or unspecified spontaneous abortion (O03.5), delayed or excessive hemorrhage following complete or unspecified spontaneous abortion (O03.6), embolism following complete or unspecified spontaneous abortion (O03.7), other and unspecified complications following complete or unspecified spontaneous abortion (O03.8) and 1 more.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 770 (Abortion with D&C, Aspiration Curettage or Hysterotomy, relative weight 1.0992) and DRG 779 (Abortion without D&C, relative weight 1.0203), in MDC 14 (Pregnancy, Childbirth and the Puerperium), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

The Medicare Code Editor treats this as a maternity diagnosis, expected only for patients age 9 through 64.

It is on the CMS list of diagnoses consistent only with female patients (the sex-conflict edit itself was retired in FY2025).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 634.91 (spontaneous abortion, without mention of complication, incomplete).

Notes that apply from higher levels

Instructions written at a parent level also apply to O03.4.

› From O03 Spontaneous abortion
Note
  • Incomplete abortion includes retained products of conception following spontaneous abortion
Includes
  • miscarriage

Broader instructions also apply from O00-O08 Pregnancy with abortive outcome and Chapter 15: Pregnancy, childbirth and the puerperium.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to O03.4.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 14 · Pregnancy, Childbirth and the Puerperium

MDC 14 · Pregnancy, Childbirth and the Puerperium

ICD-9-CM equivalent

Converter →
  • 634.91Spontaneous abortion, without mention of complication, incompleteapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about O03.4

Is O03.4 billable?

Yes. O03.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can O03.4 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict O03.4 as a principal diagnosis.

Is O03.4 a CC or MCC?

No. O03.4 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does O03.4 group to?

O03.4 is used in the MS-DRG v44.0 logic for MS-DRG 770 (Abortion with D&C, Aspiration Curettage or Hysterotomy) and MS-DRG 779 (Abortion without D&C). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for O03.4?

The CMS General Equivalence Mappings map O03.4 to ICD-9-CM 634.91.