2026 ICD-10-CM Diagnosis Code D37.2Neoplasm of uncertain behavior of small intestine

ICD-10-CM Codes›C00–D49›D37-D48›D37

ICD-10-CM D37.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

D37.2 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of small 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 gastrinoma. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neoplasms of unspecified nature or uncertain behavior.

Code Identity

ICD-10-CM Code
D37.2
Billable Status
Yes — Valid for Submission
Code Describes
Neoplasm of uncertain behavior of small intestine
Short Description
Neoplasm of uncertain behavior of small intestine
Same as the full description in the CMS dataset.
Parent Code
D37
Neoplasm of uncertain behavior of oral cavity and digestive organs

Code Classification

ChapterC00–D49Neoplasms
SectionD37-D48Neoplasms of uncertain behavior, polycythemia vera and myelodysplastic syndromes
CategoryD37Neoplasm of uncertain behavior of oral cavity and digestive organs
This CodeD37.2Neoplasm of uncertain behavior of small intestine

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Gastrinoma
  • Gastrinoma of duodenum
  • Neoplasm of Meckel's diverticulum
  • Neoplasm of uncertain behavior of duodenum
  • Neoplasm of uncertain behavior of ileum
  • Neoplasm of uncertain behavior of jejunum
  • Neoplasm of uncertain behavior of Meckel's diverticulum
  • Neoplasm of uncertain behavior of small intestine
  • Neuroendocrine neoplasm of duodenum
  • Well-differentiated neuroendocrine tumor of duodenum

Clinical ClassificationClinical

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

CCSR NEO072
Neoplasms of unspecified nature or uncertain behavior
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.

  • Gastrinoma

    a gastrin-secreting neuroendocrine tumor of the non-beta islet cells, the gastrin-secreting cells. this type of tumor is primarily located in the pancreas or the duodenum. majority of gastrinomas are malignant. they metastasize to the liver; lymph nodes; and bone but rarely elsewhere. the presence of gastrinoma is one of three requirements to be met for identification of zollinger-ellison syndrome, which sometimes occurs in families with multiple endocrine neoplasia type 1; (men 1).

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 › smallC17.9C78.4D01.40D13.30D37.2D49.0
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

Small Intestine Disorders

Your small intestine is the longest part of your digestive system - about twenty feet long! It connects your stomach to your large intestine (or colon) and folds many times to fit inside your abdomen. Your small intestine does most of the digesting of the foods you eat. It has three areas called the duodenum, the ileum, and the jejunum.

Read the full article at MedlinePlus

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

Convert D37.2 to ICD-9-CMHistory

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

ICD-9-CM
235.2 Unc behav neo intestine
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 D37.2Overview

Is D37.2 a billable code?

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

What MS-DRG does D37.2 group to?

When neoplasm of uncertain behavior of small 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 D37.2?

Under the General Equivalence Mappings, neoplasm of uncertain behavior of small intestine converts to ICD-9-CM 235.2 (unc behav neo intestine). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.