Secondary malignant neoplasm of oth parts of nervous system

This code signifies the presence of a metastatic cancerous tumor that has spread to a part of the nervous system other than the brain, spinal cord, or meninges. This includes secondary malignancies affecting peripheral nerves, autonomic nerves, or other specified nervous system structures. The primary site of the cancer originated elsewhere in the body.

Apply this code when documentation clearly indicates a secondary malignant neoplasm affecting a nervous system component not specifically covered by other C79 subcategories (e.g., C79.31 for brain, C79.32 for spinal cord, C79.40 for unspecified). This is appropriate for cases such as metastatic cancer to a cranial nerve or a peripheral nerve plexus. The medical record must specify the metastatic nature and the affected nervous system part.

• Always sequence the primary malignancy code first, followed by this code for the secondary site.
• Ensure the documentation specifies "secondary" or "metastatic" and identifies the affected nervous system part.
• Distinguish carefully from primary nervous system tumors (C70-C72) and secondary tumors of the brain (C79.31) or spinal cord (C79.32).