C17.8
BillableMalignant neoplasm of overlapping sites of small intestine
HCC Category Mapping
V28HCC 20 — Lung and Other Severe Cancers
0.000V24HCC 9 — Lung and Other Severe Cancers
0.973ESRDHCC 9 — Lung and Other Severe Cancers
0.000RxHCCHCC 22 — Cancer, Other Specified Sites
0.000What This Code Means
Cancer involving multiple overlapping sites within the small intestine rather than being limited to one section.
Coding Tips
- •Specify which sections of small intestine are involved (duodenum, jejunum, ileum) in documentation
- •Overlapping involvement suggests more extensive disease requiring comprehensive staging
Clinical Significance
Overlapping sites of the small intestine indicates a malignant tumor spanning multiple segments (duodenum, jejunum, ileum), reflecting more extensive disease. These tumors are generally associated with a worse prognosis due to their size and extent, often requiring more extensive surgical resection. Accurate coding of overlapping versus single-site disease is important for both risk adjustment and clinical research tracking of advanced small bowel malignancies.
Documentation Requirements
- ✓Documentation confirming the tumor involves two or more distinct segments of the small intestine
- ✓Identification of the specific segments involved
- ✓Histological type
- ✓Confirmation this is a single primary tumor spanning segments, not multiple separate primaries
- ✓Stage of disease and extent of resection
Commonly Confused Codes
C17.9 — Small intestine, unspecified: C17.8 is for known multi-segment disease; C17.9 is for unknown locationC17.0-C17.2 — Specific small intestine segments: use site-specific code when tumor is confined to one segmentC18.8 — Overlapping sites of colon: if the tumor extends from small intestine into colon, code the primary origin
Code Hierarchy
└C17Malignant neoplasm of small intestine└C17.8Malignant neoplasm of overlapping sites of small intestine
└C17.8Malignant neoplasm of overlapping sites of small intestine