Secondary malignant neoplasm of other specified sites

This code signifies the presence of a malignant tumor that has spread from a primary cancer site to other specific, but not otherwise classified, secondary locations in the body. It indicates metastatic disease where the secondary site is known but doesn't have a more specific ICD-10-CM code.

This code is appropriate when documentation specifies metastatic cancer to a site not covered by more specific C79.x codes, such as secondary malignancy of the peritoneum (C79.60-C79.62) or bone (C79.51-C79.52). Use this code when the medical record clearly states "metastatic to other specified sites" or lists a specific site that lacks its own dedicated metastatic code.

• Always sequence the primary malignancy code first, followed by this code for the secondary site.
• Avoid using this code if a more specific C79.x code exists for the documented metastatic site.
• Ensure the documentation clearly identifies the site as metastatic and not a primary tumor.