2026 ICD-10-CM Diagnosis Code D01.49Carcinoma in situ of other parts of intestine

ICD-10-CM Codes›C00–D49›D00-D09›D01

ICD-10-CM D01.49
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D01.49 is a billable ICD-10-CM diagnosis code for carcinoma in situ of other parts of intestine. 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 carcinoma in situ of duodenum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Gastrointestinal cancers - small intestine.

Code Identity

ICD-10-CM Code
D01.49
Billable Status
Yes — Valid for Submission
Code Describes
Carcinoma in situ of other parts of intestine
Short Description
Carcinoma in situ of other parts of intestine
Same as the full description in the CMS dataset.
Parent Code
D01.4
Carcinoma in situ of other and unspecified parts of intestine

Code Classification

ChapterC00–D49Neoplasms
SectionD00-D09In situ neoplasms
CategoryD01Carcinoma in situ of other and unspecified digestive organs
This CodeD01.49Carcinoma in situ of other parts of intestine

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Carcinoma in situ of duodenum
  • Carcinoma in situ of ileum
  • Carcinoma in situ of jejunum
  • Carcinoma in situ of Meckel's diverticulum
  • Carcinoma in situ of small intestine
  • Neoplasm of Meckel's diverticulum

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.

  • 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.

Table of NeoplasmsClinical

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

SiteMalig.
Primary		Malig.
Secondary		Ca
in situ		BenignUncertainUnspec.
duodenojejunal junctionC17.8C78.4D01.49D13.39D37.2D49.0
duodenumC17.0C78.4D01.49D13.2D37.2D49.0
ileumC17.2C78.4D01.49D13.39D37.2D49.0
intestine, intestinal › small › duodenumC17.0C78.4D01.49D13.2D37.2D49.0
intestine, intestinal › small › ileumC17.2C78.4D01.49D13.39D37.2D49.0
intestine, intestinal › small › jejunumC17.1C78.4D01.49D13.39D37.2D49.0
jejunumC17.1C78.4D01.49D13.39D37.2D49.0
Meckel diverticulum, malignantC17.3C78.4D01.49D13.39D37.2D49.0

Patient EducationClinical

Colorectal Cancer

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Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert D01.49 to ICD-9-CMHistory

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

ICD-9-CM
230.7 Ca in situ bowel NEC/NOS
Approximate The match is approximate rather than exact.

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 D01.49Overview

Is D01.49 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report carcinoma in situ of other parts of intestine on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does D01.49 group to?

When carcinoma in situ of other parts of intestine 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 D01.49?

Under the General Equivalence Mappings, carcinoma in situ of other parts of intestine converts to ICD-9-CM 230.7 (ca in situ bowel NEC/NOS). The mapping is approximate, so confirm the match fits the documentation.

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.