FY2027
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Excludes1 pair

O36- vs O36.2-

O36 and O36.2 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 O36.2
hydrops fetalis associated with ABO isoimmunization (O36.1-)
O36

Maternal care for other fetal problems

Not billable
Chapter 15
Pregnancy, childbirth and the puerperium
Section
O30-O48
Use when the record says
  • the listed conditions in the fetus as a reason for hospitalization or other obstetric care of the mother, or for termination of pregnancy
O36.2

Maternal care for hydrops fetalis

Not billable
Chapter 15
Pregnancy, childbirth and the puerperium
Section
O30-O48
Use when the record says
  • Maternal care for hydrops fetalis NOS
  • Maternal care for hydrops fetalis not associated with isoimmunization
Indexed under
  • Pregnancy › complicated by › hydrops › fetalis

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