Malignant neoplasm of unspecified ovary

This code identifies a primary cancerous tumor originating in an ovary when the specific ovary (left or right) is not documented. It signifies an uncontrolled growth of abnormal cells within ovarian tissue, confirmed as malignant.

Use this code when the medical record clearly indicates a malignant neoplasm of the ovary, but the laterality (left or right) is not specified by the provider. This is appropriate for initial diagnoses or follow-up when laterality remains undetermined.

• Avoid using this code if the documentation specifies laterality; instead, use C56.1 (right ovary) or C56.2 (left ovary).
• Always query the provider for laterality if possible, as more specific coding improves data accuracy.
• Sequence this code as the primary diagnosis when ovarian malignancy is the reason for the encounter, unless another condition is the principal diagnosis.