FY2027
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Excludes1 pair

O01- vs O02.1

O01 and O02.1 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 O02.1
missed abortion with hydatidiform mole (O01.-)
O01

Hydatidiform mole

Not billable
Chapter 15
Pregnancy, childbirth and the puerperium
Section
O00-O08
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

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