Malignant neoplasm of overlapping sites of small intestine

This code signifies a cancerous tumor that originates in or spreads across multiple contiguous or overlapping anatomical sites within the small intestine, such as the duodenum, jejunum, and ileum, making it impossible to assign a single, more specific small intestine site. It indicates a primary malignancy affecting more than one distinct region of the small bowel.

Use this code when the medical record explicitly documents a malignant neoplasm involving overlapping or contiguous sites of the small intestine, and the physician cannot specify a single primary site within the small bowel. This typically applies when the tumor spans across boundaries of different small intestinal segments or when the exact origin within the small intestine is unclear due to extensive involvement.

• Ensure documentation clearly states "overlapping" or "contiguous" involvement of multiple small intestine sites.
• Do not use if a specific primary site within the small intestine (e.g., duodenum, jejunum, ileum) can be identified.
• Always sequence this code as the primary diagnosis when it represents the reason for the encounter, followed by any relevant secondary diagnoses.