Malignant neoplasm of small intestine (C17) ICD-10-CM
The C17 code range covers malignant neoplasm of small intestine with 7 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- malignant carcinoid tumors of the small intestine C7A.01
Codes in the C17 Range 7 codes · 6 billable
- C17 Malignant neoplasm of small intestineNon-billable
- C17.0 Malignant neoplasm of duodenum
- C17.1 Malignant neoplasm of jejunum
- C17.2 Malignant neoplasm of ileum
- C17.3 Meckel's diverticulum, malignant
- C17.8 Malignant neoplasm of overlapping sites of small intestine
- C17.9 Malignant neoplasm of small intestine, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the C17 range.
Duodenal Neoplasms
Tumors or cancer of the DUODENUM.
Duodenum
The shortest and widest portion of the SMALL INTESTINE adjacent to the PYLORUS of the STOMACH. It is named for having the length equal to about the width of 12 fingers.
Jejunal Neoplasms
Tumors or cancer in the JEJUNUM region of the small intestine (INTESTINE, SMALL).
Jejunum
The middle portion of the SMALL INTESTINE, between DUODENUM and ILEUM. It represents about 2/5 of the remaining portion of the small intestine below duodenum.
About the C17 Code Range
The ICD-10 code section C17 covers malignant neoplasms, or cancers, of the small intestine and its specific parts. These codes are used to classify various types of cancer affecting the small bowel, including the duodenum, jejunum, ileum, Meckel's diverticulum, and overlapping sites within the small intestine.
This section includes detailed subcodes like C17.0 for cancers of the duodenum—often known as adenocarcinoma or lymphoma of the duodenum—and C17.1 and C17.2 for malignant tumors of the jejunum and ileum, respectively. C17.3 identifies cancers of Meckel's diverticulum, while C17.8 refers to overlapping malignant neoplasms that affect multiple areas of the small intestine. The C17.9 code is used when the exact site within the small intestine is unspecified but still malignant, covering conditions like B cell lymphoma, squamous cell carcinoma, and other primary adenocarcinomas. This ICD-10 code section helps healthcare providers and medical coders specifically identify and document the exact location and type of small intestine cancer for effective treatment and record-keeping.
Questions About This Page
How many billable codes are in the C17 range?
Of the 7 codes in this range, 6 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the C17 range classify?
The range classifies malignant neoplasm of small intestine. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
