Secondary malignant neoplasm of small intestine including duodenum

This code signifies the presence of a metastatic cancerous tumor that originated elsewhere in the body and has spread to the small intestine, including the duodenum. It indicates that the small intestine is not the primary site of the malignancy but rather a secondary location for tumor growth.

Use this code when medical record documentation clearly states a secondary or metastatic malignant neoplasm affecting any part of the small intestine (duodenum, jejunum, or ileum). This diagnosis is typically supported by pathology reports confirming metastatic disease, imaging studies showing spread, and clinical notes indicating a known primary malignancy.

• Always code the primary malignancy first, followed by this code for the secondary site.
• Distinguish carefully between primary small intestine cancers and metastatic disease; this code is exclusively for secondary involvement.
• Ensure documentation specifies "secondary" or "metastatic" to the small intestine; "malignant neoplasm of small intestine" alone is insufficient.