Polyneuropathy in malignant disease

This code describes a condition where multiple peripheral nerves are damaged or diseased (polyneuropathy) as a direct consequence or complication of a malignant (cancerous) disease. This neurological dysfunction is not due to direct tumor invasion or metastasis, but rather paraneoplastic effects or other systemic impacts of the malignancy.

Use this code when documentation clearly indicates a diagnosis of polyneuropathy that is attributed to an underlying malignant neoplasm. This typically applies to paraneoplastic syndromes affecting the nervous system, or other indirect effects of cancer on nerve function. The physician's notes should explicitly link the polyneuropathy to the malignancy.

• Always code the underlying malignant neoplasm first, as this polyneuropathy is a manifestation of the cancer.
• Distinguish from polyneuropathy caused by chemotherapy or radiation, which would be coded differently (e.g., drug-induced polyneuropathy).
• Ensure documentation specifies "malignant disease" as the etiology; avoid using for benign tumors or unspecified neoplasms.