O02.1 vs Z33.2
O02.1 and Z33.2 can never be reported together. ICD-10-CM declares them mutually exclusive with an Excludes1 note, meaning the two conditions cannot occur in the same patient — so exactly one of them is correct for any given encounter.
The official note, declared on Z33.2
early fetal death with retention of dead fetus (O02.1)
O02.1
Missed abortion
Billable
- Chapter 15
- Pregnancy, childbirth and the puerperium
- Section
- O00-O08
Use when the record says
- Early fetal death, before completion of 20 weeks of gestation, with retention of dead fetus
Indexed under
- Abortion › missed (complete) (spontaneous)
- Missed › abortion
- Dead › fetus, retained › early pregnancy
- Retention › products of conception › early pregnancy
- Delivery › complicated › by › intrauterine fetal death, early (childbirth) (labor)
Z33.2
Encounter for elective termination of pregnancy
Billable
- Chapter 21
- Factors influencing health status and contact with health services
- Section
- Z30-Z39
Indexed under
- Abortion › induced (complete) (spontaneous)
- Encounter › termination of pregnancy, elective (with health service) (for)
- Termination › pregnancy, elective
These two codes sit in different chapters of the Tabular List, which is usually the clearest signal that they describe different underlying processes rather than different degrees of the same one.
Excludes1 is not always absolute: where two conditions covered by the note are genuinely unrelated, CMS guidance permits reporting both. Document the reasoning rather than assuming it. More on Excludes1 vs Excludes2 · FY2027