Secondary malignant neoplasm of other parts of nervous system

This code signifies the presence of a metastatic cancerous tumor that has spread to various parts of the nervous system, excluding the brain, spinal cord, and cranial nerves. These secondary tumors originate from a primary malignancy located elsewhere in the body. It indicates the nervous system is affected by cancer that did not start there.

Apply this code when documentation specifies a secondary or metastatic malignant neoplasm affecting peripheral nerves, autonomic nervous system, or other unspecified parts of the nervous system. This diagnosis is supported by pathology reports confirming metastatic disease or imaging studies demonstrating lesions consistent with metastases in these locations.

• Always sequence the primary malignancy code first, followed by this code for the secondary site.
• Distinguish carefully between primary nervous system tumors and secondary (metastatic) tumors; this code is exclusively for secondary sites.
• Do not use this code for metastases to the brain (198.3), spinal cord (198.3), or cranial nerves (198.3).