ICD-10-CM 2027 diagnosis code
O02.1Missed abortion
O02.1 is a valid, billable ICD-10-CM code for missed abortion. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
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 O02.1
O02.1 is the ICD-10-CM diagnosis code for Missed abortion. It belongs to category O02 (other abnormal products of conception), 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 O02 (other abnormal products of conception), O02.1 is specifically for Missed abortion. Related codes cover Blighted ovum and nonhydatidiform mole (O02.0), other specified abnormal products of conception (O02.8) and abnormal product of conception, unspecified (O02.9).
Don't report O02.1 together with the conditions in its Excludes1 note: failed induced abortion (O07.-), fetal death (intrauterine) (late) (O36.4), missed abortion with blighted ovum (O02.0), missed abortion with hydatidiform mole (O01.-) and 4 more.
Use an additional code from category O08 to identify any associated complication.
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 632 (Missed abortion).
Coding notes
- Early fetal death, before completion of 20 weeks of gestation, with retention of dead fetus
- failed induced abortion (O07.-)
- fetal death (intrauterine) (late) (O36.4)
- missed abortion with blighted ovum (O02.0)
- missed abortion with hydatidiform mole (O01.-)
- missed abortion with nonhydatidiform (O02.0)
- missed abortion with other abnormal products of conception (O02.8-)
- missed delivery (O36.4)
- stillbirth (P95)
Notes that apply from higher levels
Instructions written at a parent level also apply to O02.1.
Broader instructions also apply from O00-O08 Pregnancy with abortive outcome and Chapter 15: Pregnancy, childbirth and the puerperium.
Alphabetic index entries
12 entriesTerms in the official ICD-10-CM index that lead to O02.1.
- Abortion (complete) (spontaneous) › missed
- Dead › fetus, retained (mother) › early pregnancy
- Delivery (childbirth) (labor) › complicated › by › fetal › death, early
- Delivery (childbirth) (labor) › complicated › by › intrauterine fetal death, early
- Missed › abortion
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › death of fetus (near term) › early pregnancy
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › fetal (maternal care for) › death (near term) › early pregnancy
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › intrauterine fetal death (near term) › early pregnancy
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › missed › abortion
- Retention › dead › fetus (at or near term) (mother) › early fetal death
- Retention › fetus › dead › early
- Retention › products of conception › early pregnancy (dead fetus)
Codes whose notes reference O02.1
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 →- 632Missed abortionexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about O02.1
Is O02.1 billable?
- Yes. O02.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can O02.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict O02.1 as a principal diagnosis.
Is O02.1 a CC or MCC?
- No. O02.1 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does O02.1 group to?
- O02.1 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 O02.1?
- The CMS General Equivalence Mappings map O02.1 to ICD-9-CM 632.