Other malignant neuroendocrine tumors

This code signifies the presence of a malignant neuroendocrine neoplasm that does not fit into more specific categories of neuroendocrine tumors. These are rare cancers originating from neuroendocrine cells throughout the body, exhibiting features of both nerve and endocrine cells. The tumor's behavior can range from indolent to aggressive, depending on its primary site and differentiation.

Utilize this code when documentation clearly identifies a malignant neuroendocrine tumor, but a more specific ICD-10-CM code for the primary site or type (e.g., carcinoid tumor of a specific organ, pancreatic neuroendocrine tumor) is not available or appropriate. This code is supported by pathology reports confirming malignancy and neuroendocrine differentiation, along with clinical notes detailing the tumor's location and characteristics.

• Ensure the documentation explicitly states "malignant neuroendocrine tumor" and that no more specific code is applicable.
• Always sequence this code after the primary malignancy if the neuroendocrine tumor is a metastasis or a secondary site.
• Avoid using this code if a specific site-defined neuroendocrine tumor code (e.g., C7A.0xx series) can be assigned.