2026 ICD-10-CM Diagnosis Code O02.1Missed abortion
ICD-10-CM Codes›O00-O9A›O00-O08›O02
- Billable — Valid for Submission
- Not Chronic
O02.1 is a billable ICD-10-CM diagnosis code for missed abortion. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). Coders also document this condition as missed miscarriage. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Molar pregnancy and other abnormal products of conception.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O02.1.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Missed miscarriage
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Early fetal death, before completion of 20 weeks of gestation, with retention of dead fetus
Type 1 Excludes
- 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
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Abortion (complete) (spontaneous) - O03.9
- missed - O02.1
- Dead
- fetus, retained (mother) - O36.4
- early pregnancy - O02.1
- Delivery (childbirth) (labor)
- complicated - O75.9
- by
- fetal
- death, early - O02.1
- intrauterine fetal death, early - O02.1
- Pregnancy (single) (uterine) - See Also: Delivery and Puerperal; - Z33.1
- complicated by (care of) (management affected by)
- death of fetus (near term) - O36.4
- early pregnancy - O02.1
- early pregnancy - O02.1
- intrauterine fetal death (near term) - O36.4
- early pregnancy - O02.1
- missed
- abortion - O02.1
- Retention - See Also: Retained;
- dead
- fetus (at or near term) (mother) - O36.4
- early fetal death - O02.1
- fetus
- early pregnancy (dead fetus) - O02.1
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- 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)
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Missed Abortion
retention in uterus of an abortus.
Patient EducationClinical
Miscarriage
A miscarriage is an unexpected loss of pregnancy before the 20th week. Most miscarriages happen very early in the pregnancy, often before a woman even knows she is pregnant.
The full article covers:
- What is a miscarriage?
- What causes a miscarriage?
- What are the signs of a miscarriage?
- How is a miscarriage diagnosed?
- What is the treatment for a miscarriage?
- Can a miscarriage be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O02.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O02.1Overview
Is O02.1 (Other abnormal products of conception) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report missed abortion on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Who can O02.1 be reported for?
The Medicare Code Editor checks missed abortion against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
What is the ICD-9 equivalent of O02.1?
Under the General Equivalence Mappings, missed abortion converts to ICD-9-CM 632 (missed abortion). The mapping is a direct match.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
