2026 ICD-10-CM Diagnosis Code C17.2Malignant neoplasm of ileum
ICD-10-CM Codes›C00–D49›C15-C26›C17
- Billable — Valid for Submission
- Chronic Condition
C17.2 is a billable ICD-10-CM diagnosis code for malignant neoplasm of ileum. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 374 through 376. Coders also document this condition as adenocarcinoma of ileum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal cancers - small intestine.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adenocarcinoma of ileum
- Adenocarcinoma of small intestine
- Malignant neoplasm of ileum
- Primary adenocarcinoma of ileum
- Primary adenocarcinoma of small intestine
- Primary malignant neoplasm of ileum
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
- malignant neoplasm of ileocecal valve C18.0
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.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Table of NeoplasmsClinical
Patient EducationClinical
Intestinal Cancer
Your small intestine is part of your digestive system. It is a long tube that connects your stomach to your large intestine. Intestinal cancer is rare, but eating a high-fat diet or having Crohn's disease, celiac disease, or a history of colonic polyps can increase your risk.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert C17.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About C17.2Overview
Is C17.2 (Malignant neoplasm of small intestine) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of ileum on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does C17.2 group to?
When malignant neoplasm of ileum is the principal diagnosis on an inpatient stay, it groups to MS-DRG 374, 375, 376, with relative weights from 0.9243 to 2.1387 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of C17.2?
Under the General Equivalence Mappings, malignant neoplasm of ileum converts to ICD-9-CM 152.2 (malignant neoplasm ileum). The mapping is a direct match.
Footnotes
[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:
- The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
- The condition places limitations on self-care, independent living, and social interactions.
