C58 vs O01.9
C58 (Malignant neoplasm of placenta) compared with O01.9 (Hydatidiform mole, unspecified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. C58 carries an Excludes1 note covering O01.9: “hydatidiform mole NOS (O01.9)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| C58Malignant neoplasm of placenta | O01.9Hydatidiform mole, unspecified | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) |
| Definition | Malignant neoplasm of placenta is a billable ICD-10-CM diagnosis code (C58). | Hydatidiform mole, unspecified is a billable ICD-10-CM diagnosis code (O01.9). |
| Includes | choriocarcinoma NOS chorionepithelioma NOS malignant neoplasm of skin of female genital organs | Trophoblastic disease NOS Vesicular mole NOS |
| Use additional code | — | code from category O08 to identify any associated complication. |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources