FY2027
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Excludes1 pair

O02.1 vs Z33.2

O02.1 and Z33.2 are not coded together. ICD-10-CM declares them mutually exclusive with an Excludes1 note — the two conditions are not expected to occur together, so exactly one of them is normally correct for a given encounter. The Official Guidelines carve out one exception: if the two conditions are clearly unrelated to each other, both may be reported.

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
  • Missed › abortion
  • Dead › fetus, retained › early pregnancy
  • Retention › products of conception › early pregnancy (dead fetus)
  • Delivery › complicated › by › intrauterine fetal death, early
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 (encounter for)
  • Encounter › termination of pregnancy, elective
  • 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