2027 ICD-10-CM Diagnosis Code C17Malignant neoplasm of small intestine

ICD-10-CM Codes›C00–D49›C15-C26›C17

ICD-10-CM C17
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

C17 is a non-billable ICD-10-CM category code for malignant neoplasm of small intestine, so it cannot be submitted on claims. Use a more specific code from this category instead, such as C17.0, C17.1, C17.2, and C17.3.

Code Identity

ICD-10-CM Code
C17
Billable Status
No — Non-Billable Category
Code Describes
Malignant neoplasm of small intestine
Short Description
Malignant neoplasm of small intestine
Same as the full description in the CMS dataset.
Chapter
C15-C26
Malignant neoplasms of digestive organs

Code Classification

ChapterC00–D49Neoplasms
SectionC15-C26Malignant neoplasms of digestive organs
CategoryC17Malignant neoplasm of small intestine
This CodeC17Malignant neoplasm of small intestine

Specific Coding for Malignant neoplasm of small intestineOverview

Non-specific codes like C17 require more characters. Use one of these billable codes instead:

  • Use C17.0 for Malignant neoplasm of duodenum

  • Use C17.1 for Malignant neoplasm of jejunum

  • Use C17.2 for Malignant neoplasm of ileum

  • Use C17.3 for Meckel's diverticulum, malignant

  • Use C17.8 for Malignant neoplasm of overlapping sites of small intestine

  • Use C17.9 for Malignant neoplasm of small intestine, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to C17: its own notes plus those printed at block C15-C26 and Chapter 2. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On C17 itself
  • malignant carcinoid tumors of the small intestine (C7A.01)
From Block C15-C26 Malignant neoplasms of digestive organs applies to 60 codes
  • Kaposi's sarcoma of gastrointestinal sites (C46.4)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block C15-C26 Malignant neoplasms of digestive organs applies to 60 codes
  • gastrointestinal stromal tumors (C49.A-)

Notes

General instructions on how these codes are used.

From Chapter 2 (C00-D49) Neoplasms applies to 1,730 codes
  • Functional activity
  • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
  • Morphology [Histology]
  • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
  • Primary malignant neoplasms overlapping site boundaries
  • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
  • Malignant neoplasm of ectopic tissue
  • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name C17, its category, or a range that includes it.

Applicable To 2

These notes mention C17.

  • Z85.068 Personal history of other malignant neoplasm of small intestine
    Conditions classifiable to C17
  • Z80.0 Family history of malignant neoplasm of digestive organs
    Conditions classifiable to C15-C26 names C15-C26, which includes this code

Clinical InformationClinical

  • Malignant Small Intestinal Neoplasm

    a primary or metastatic malignant neoplasm that affects the small intestine.

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.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About C17Overview

What is the ICD-10 code for malignant neoplasm of small intestine?

C17 is the ICD-10-CM category for malignant neoplasm of small intestine, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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

No. This is a category header that groups the codes for malignant neoplasm of small intestine, and headers cannot be submitted on claims. Claims for malignant neoplasm of small intestine need a more specific code from this category, such as C17.0, C17.1, and C17.2.

Can C17 be reported with C7A.01?

Not as a rule. The Excludes1 note on C17 lists "malignant carcinoid tumors of the small intestine (C7A.01)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).