Excludes1 pair
C58 vs D39.2
C58 and D39.2 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 C58
chorioadenoma (destruens) (D39.2)
C58
Malignant neoplasm of placenta
Billable
- Chapter 2
- Neoplasms
- Section
- C51-C58
Use when the record says
- choriocarcinoma NOS
- chorionepithelioma NOS
Indexed under
- Choriocarcinoma › unspecified site › female
- Carcinoma › chorionic › unspecified site › female
D39.2
Neoplasm of uncertain behavior of placenta
Billable
- Chapter 2
- Neoplasms
- Section
- D37-D48
Use when the record says
- Chorioadenoma destruens
- Invasive hydatidiform mole
- Malignant hydatidiform mole
Indexed under
- Chorioadenoma (destruens)
- Mola destruens
- Hydatidiform mole › invasive
- Hydatidiform mole › malignant
- Mole › destructive
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