C17.3

HCC Category Mapping

What This Code Means

This is a rare cancer that develops in Meckel's diverticulum, which is a small pouch-like remnant of tissue in the small intestine that some people are born with. The malignant tumor in this location requires specific coding to identify both the cancer and its unusual site.

Coding Tips

• •Verify documentation confirms malignancy in Meckel's diverticulum specifically, as this is a rare condition; do not confuse with benign Meckel's diverticulum (Q43.0)
• •Ensure the histological type of the malignancy is documented separately if available, as additional codes may be needed to specify the cancer type (e.g., carcinoid, adenocarcinoma)

Clinical Significance

Malignant Meckel diverticulum is an extremely rare cancer arising in a congenital remnant of the omphalomesenteric duct in the small intestine. This code is uniquely specific because it identifies both the malignant nature and the unusual anatomical origin. The rarity of this diagnosis makes accurate coding critical, as it affects both clinical research data and appropriate risk adjustment for an uncommon condition requiring complex surgical management.

Documentation Requirements

• ✓Documentation confirming both the presence of Meckel diverticulum and malignancy within it
• ✓Histological type of the malignancy (carcinoid, adenocarcinoma, sarcoma)
• ✓Pathological confirmation of malignancy (not just presence of Meckel diverticulum)
• ✓Stage of disease and extent of surgical resection
• ✓Distinction from benign Meckel diverticulum

Commonly Confused Codes