Secondary malignant neoplasm of unspecified ovary

This code indicates the presence of a malignant tumor in the ovary that originated from a primary cancer site elsewhere in the body, where the specific ovary (left or right) is not documented. It signifies metastatic disease to the ovary, not a primary ovarian cancer.

Use this code when medical record documentation confirms a secondary (metastatic) malignant neoplasm of the ovary, but the laterality (left or right) is unspecified. This typically occurs when a patient has a known primary cancer and subsequent imaging or biopsy reveals ovarian involvement without specifying the side.

• Do not use this code for primary ovarian cancer; refer to codes in the C56.- category for primary malignant neoplasms of the ovary.
• Always attempt to clarify laterality with the provider if possible to use a more specific code (C79.61 for right, C79.62 for left).
• Sequence this code after the code for the primary malignant neoplasm, unless the secondary site is the reason for the encounter.