Secondary malignant neoplasm of genital organs

This code signifies the presence of a malignant tumor in the genital organs that originated from a primary cancer site elsewhere in the body. It indicates metastatic disease affecting structures such as the ovaries, uterus, prostate, testes, or other reproductive organs. The tumor cells found in the genital organs are histologically identical to those of the primary malignancy.

Apply this code when documentation clearly states a secondary or metastatic malignant neoplasm affecting any genital organ. This is typically used in cases where a patient has a known primary cancer (e.g., breast, colon, lung) and subsequent imaging or biopsy confirms spread to the reproductive system. Supporting documentation includes pathology reports, operative reports, and physician notes detailing the metastatic nature and specific site.

• Always sequence the primary malignant neoplasm code before this secondary site code, unless the primary site is unknown or has been excised and is no longer being treated.
• Be specific about the affected genital organ if further detail is available (e.g., C79.60 for unspecified secondary malignant neoplasm of ovary).
• Do not use this code for primary malignant neoplasms originating in the genital organs; those have specific C51-C58 codes.