O02.1 Missed abortion

Billable ICD-10-CM code, FY2026.

Applicable to

• Early fetal death, before completion of 20 weeks of gestation, with retention of dead fetus

Excludes1 (never code together)

• 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)

Applies from O02 Other abnormal products of conception

Excludes1 (never code together)

• papyraceous fetus (O31.0-)

Use additional code

• code from category O08 to identify any associated complication.

MS-DRG index

Defines the logic of DRG(s) 770 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 632 Missed abortion

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O02.1

Back-references to O02.1

• Type 1 Excludes: O36.4 Maternal care for intrauterine death ("missed abortion (O02.1)")
• Type 1 Excludes: P95 Stillbirth ("missed abortion (O02.1)")
• Type 1 Excludes: Z33.2 Encounter for elective termination of pregnancy ("early fetal death with retention of dead fetus (O02.1)")

Back-references to O02

• Type 1 Excludes: D65 Disseminated intravascular coagulation [defibrination syndrome] ("abortion or ectopic or molar pregnancy (O00-O07, O08.1)")
• Type 2 Excludes: D68 Other coagulation defects ("coagulation defects complicating abortion or ectopic or molar pregnancy (O00-O07, O08.1)")
• Type 1 Excludes: G08 Intracranial and intraspinal phlebitis and thrombophlebitis ("abortion, ectopic or molar pregnancy (O00-O07, O08.7)")
• Type 2 Excludes: I26 Pulmonary embolism ("pulmonary embolism complicating abortion, ectopic or molar pregnancy (O00-O07, O08.2)")
• Code First: I47 Paroxysmal tachycardia ("abortion or ectopic or molar pregnancy (O00-O07, O08.8)")
• Code First: I49 Other cardiac arrhythmias ("abortion or ectopic or molar pregnancy (O00-O07, O08.8)")
• Code First: I50 Heart failure ("heart failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)")
• Code First: I74 Arterial embolism and thrombosis ("embolism and thrombosis complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)")
• Code First: I80 Phlebitis and thrombophlebitis (", if applicable: phlebitis and thrombophlebitis complicating abortion, ectopic or molar pregnancy (O00-O07, O08.7)")
• Code First: I82 Other venous embolism and thrombosis ("abortion, ectopic or molar pregnancy (O00-O07, O08.7)")
• Type 1 Excludes: K65 Peritonitis ("peritonitis with or following abortion or ectopic or molar pregnancy (O00-O07, O08.0)")
• Type 2 Excludes: K72 Hepatic failure, not elsewhere classified ("hepatic failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)")
• Type 1 Excludes: O20 Hemorrhage in early pregnancy ("pregnancy with abortive outcome (O00-O08)")
• Type 1 Excludes: R34 Anuria and oliguria ("anuria and oliguria complicating abortion or ectopic or molar pregnancy (O00-O07, O08.4)")
• Type 1 Excludes: R55 Syncope and collapse ("shock complicating or following abortion or ectopic or molar pregnancy (O00-O07, O08.3)")
• Type 1 Excludes: R57 Shock, not elsewhere classified ("shock complicating or following ectopic or molar pregnancy (O00-O07, O08.3)")
• Type 1 Excludes: T79.0 Air embolism (traumatic) ("air embolism complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)")
• Type 1 Excludes: T79.1 Fat embolism (traumatic) ("abortion or ectopic or molar pregnancy (O00-O07, O08.2)")
• Type 1 Excludes: T79.4 Traumatic shock ("shock complicating abortion or ectopic or molar pregnancy (O00-O07, O08.3)")
• Type 1 Excludes: T81.1 Postprocedural shock ("shock following abortion or ectopic or molar pregnancy (O00-O07, O08.3)")
• Type 1 Excludes: T81.7 Vascular complications following a procedure, not elsewhere classified ("embolism complicating abortion or ectopic or molar pregnancy (O00-O07, O08.2)")

Diagnosis Index entries for 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)

Nearby codes

• O02 Other abnormal products of conception
• O02.0 Blighted ovum and nonhydatidiform mole
• O02.1 Missed abortion (this code)
• O02.8 Other specified abnormal products of conception
• O02.81 Inappropriate change in quantitative human chorionic gonadotropin (hCG) in early pregnancy
• O02.89 Other abnormal products of conception
• O02.9 Abnormal product of conception, unspecified