2026 ICD-10-CM Diagnosis Code C17.0Malignant neoplasm of duodenum

ICD-10-CM Codes›C00–D49›C15-C26›C17

ICD-10-CM C17.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

C17.0 is a billable ICD-10-CM diagnosis code for malignant neoplasm of duodenum. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal cancers - small intestine.

Code Identity

ICD-10-CM Code
C17.0
Billable Status
Yes — Valid for Submission
Code Describes
Malignant neoplasm of duodenum
Short Description
Malignant neoplasm of duodenum
Same as the full description in the CMS dataset.
Parent Code
C17
Malignant neoplasm of small intestine

Code Classification

ChapterC00–D49Neoplasms
SectionC15-C26Malignant neoplasms of digestive organs
CategoryC17Malignant neoplasm of small intestine
This CodeC17.0Malignant neoplasm of duodenum

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Adenocarcinoma of duodenum
  • Adenocarcinoma of small intestine
  • Carcinoma of duodenum
  • Leiomyosarcoma of duodenum
  • Leiomyosarcoma of small intestine
  • Lymphoma of small bowel
  • Malignant lymphoma of duodenum
  • Malignant mesenchymal neoplasm of duodenum
  • Malignant neoplasm of duodenum
  • Primary carcinoma of duodenum
  • Primary malignant mesenchymal neoplasm of duodenum
  • Primary malignant neoplasm of duodenum
  • Primary sarcoma of small intestine

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR NEO014
Gastrointestinal cancers - small intestine
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • 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.

Table of NeoplasmsClinical

Anatomical sites in the Table of Neoplasms that reference this code family.

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
duodenumC17.0C78.4D01.49D13.2D37.2D49.0
intestine, intestinal › small › duodenumC17.0C78.4D01.49D13.2D37.2D49.0

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 C17.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
152.0 Malignant neopl duodenum
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About C17.0Overview

Is C17.0 (Malignant neoplasm of small intestine) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report malignant neoplasm of duodenum on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does C17.0 group to?

When malignant neoplasm of duodenum 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 C17.0?

Under the General Equivalence Mappings, malignant neoplasm of duodenum converts to ICD-9-CM 152.0 (malignant neopl duodenum). 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.