Malignant neoplasm of bilateral ovaries

This code signifies the presence of a primary cancerous tumor affecting both the left and right ovaries. It indicates that the malignancy originated in the ovarian tissue and is present in both adnexa.

Apply this code when documentation clearly states a primary malignant neoplasm involving both ovaries. This typically occurs following pathological confirmation from biopsy or surgical resection, or based on definitive imaging and clinical findings.

• Ensure the documentation explicitly states "bilateral" involvement; otherwise, use codes for unilateral ovarian malignancy (C56.1 or C56.2).
• Do not use this code for metastatic disease to the ovaries; instead, code the primary site and secondary malignant neoplasm of ovary (C79.61 or C79.62).
• Sequence this code as the primary diagnosis when the ovarian malignancy is the reason for the encounter, followed by any relevant histology codes.