Secondary carcinoid tumors of other sites

This code signifies the presence of metastatic neuroendocrine tumors, specifically carcinoid tumors, that have spread from a primary site to other, unspecified locations in the body. These secondary tumors originate from enterochromaffin cells and are characterized by their ability to secrete vasoactive substances.

Use this code when documentation confirms metastatic carcinoid tumor involvement in sites not specifically classified elsewhere, and the primary site is either unknown or has been previously treated. This code is appropriate when the physician explicitly states "secondary carcinoid tumor of other sites" or similar language indicating widespread or unspecific metastatic disease.

• Always sequence the primary malignant neoplasm code first, if known and still active.
• Distinguish from C7A.0x codes, which specify the primary site of malignant carcinoid tumors.
• Ensure documentation clearly states "secondary" or "metastatic" to justify using this code.