Malignant neoplasm of ileum

This code signifies the presence of a cancerous tumor originating in the ileum, the final section of the small intestine. It indicates a primary malignancy rather than a metastatic spread from another site. The tumor arises from the cells lining the ileal wall.

Assign this code when documentation confirms a primary malignant neoplasm located specifically within the ileum. This typically follows a biopsy and pathological confirmation of malignancy. Use for cases where the tumor is confined to the ileum and has not spread to the ileocecal valve.

• Ensure documentation clearly specifies "ileum" as the primary site; avoid using for unspecified small intestine malignancies.
• Distinguish carefully from malignancies of the ileocecal valve, which are coded separately.
• Sequence this code as the primary diagnosis when the ileal malignancy is the reason for the encounter.