Secondary neuroendocrine tumors (C7B)

ICD-10 code range C7B is specifically used to classify secondary neuroendocrine tumors, which are cancerous growths that have spread from their original site to other parts of the body. These codes are crucial for identifying malignant tumors such as carcinoid tumors and Merkel cell carcinoma when they occur as metastases.

Within this range, the code C7B.0 covers secondary carcinoid tumors, including detailed locations such as distant lymph nodes (C7B.01), liver (C7B.02), bone (C7B.03), and peritoneum (C7B.04), with C7B.00 used when the site is unspecified. C7B.1 identifies secondary Merkel cell carcinoma, a rare and aggressive skin cancer that has metastasized. Additionally, C7B.8 encompasses other lesser-defined secondary neuroendocrine tumors and is associated with terms like secondary neuroendocrine carcinoma of peritoneum or carcinoma of peritoneum. Understanding these codes helps healthcare professionals accurately document and treat metastatic neuroendocrine malignancies based on their location and type.