O02.1
Missed abortion
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
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)
Early fetal death, before completion of 20 weeks of gestation, with retention of dead fetus
supervision of normal pregnancy (Z34.-)
mental and behavioral disorders associated with the puerperium (F53.-) obstetrical tetanus (A34) postpartum necrosis of pituitary gland (E23.0) puerperal osteomalacia (M83.0)
code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
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
Official Guidelines for O02.1
FY 2026 ›Subsections
- I.C.15.aGeneral Rules for Obstetric Cases
- I.C.15.bSelection of OB Principal or First-listed Diagnosis
- I.C.15.cPre-existing conditions versus conditions due to the pregnancy
- I.C.15.dPre-existing hypertension in pregnancy
- I.C.15.eFetal Conditions Affecting the Management of the Mother
- I.C.15.fHIV Infection in Pregnancy, Childbirth and the Puerperium
- I.C.15.gDiabetes mellitus in pregnancy
- I.C.15.hLong term use of insulin and oral hypoglycemics
- I.C.15.iGestational (pregnancy induced) diabetes
- I.C.15.jSepsis and septic shock complicating abortion, pregnancy, childbirth and the puerperium
- I.C.15.kPuerperal sepsis
- I.C.15.lAlcohol, tobacco and drug use during pregnancy, childbirth and the puerperium
- I.C.15.mPoisoning, toxic effects, adverse effects and underdosing in a pregnant patient
- I.C.15.nNormal Delivery, Code O80
- I.C.15.oThe Peripartum and Postpartum Periods
- I.C.15.pCode O94, Sequelae of complication of pregnancy, childbirth, and the puerperium
- I.C.15.qTermination of Pregnancy and Spontaneous abortions
- I.C.15.rAbuse in a pregnant patient
- I.C.15.sCOVID-19 infection in pregnancy, childbirth, and the puerperium
Sections that reference O02.1
- I.C.15.a.1)Codes from chapter 15 and sequencing priority
Obstetric cases require codes from chapter 15, codes in the range O00- O9A, Pregnancy, Childbirth, and the Puerperium. …
- I.C.21.c.11)Encounters for Obstetrical and Reproductive ServicesChapter 21
… Category Z3A codes should not be assigned for pregnancies with abortive outcomes (categories O00- O08), elective termination of pregnancy (code Z33.2), nor for postpartum conditions, as category Z3A is not applicable to these …
Sections whose FY 2026 text names O02.1, its O02 category, or a range containing it — the chapter guidance above is the authoritative source.
Find O02.1 in the alphabetic index
12 index paths lead to this code
- Abortion › missed
- Missed › abortion
- Dead › fetus, retained › early pregnancy
- Retention › products of conception › early pregnancy
- Delivery › complicated › by › intrauterine fetal death, early
- Pregnancy › complicated by › death of fetus › early pregnancy
- Pregnancy › complicated by › intrauterine fetal death › early pregnancy
- Pregnancy › complicated by › missed › abortion
- Retention › dead › fetus › early fetal death
- Retention › fetus › dead › early
- Delivery › complicated › by › fetal › death, early
- Pregnancy › complicated by › fetal › death › early pregnancy