2026 ICD-10-CM Diagnosis Code D37.9Neoplasm of uncertain behavior of digestive organ, unspecified
ICD-10-CM Codes›C00–D49›D37-D48›D37
- Billable — Valid for Submission
- Not Chronic
D37.9 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of digestive organ, unspecified. 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
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Gastrinoma
- Neoplasm of uncertain behavior of digestive and respiratory systems
- Neoplasm of uncertain behavior of digestive organ
- Neoplasm of uncertain behavior of gastrointestinal tract
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- unspecified site - D37.9
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Gastrinoma
- unspecified site
- Tumor
- papillary
- cystic
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
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.
| Site | Malig. Primary | Malig. Secondary | Ca in situ | Benign | Uncertain | Unspec. |
|---|---|---|---|---|---|---|
| alimentary canal or tract NEC | C26.9 | C78.80 | D01.9 | D13.99 | D37.9 | D49.0 |
| digestive organs, system, tube, or tract NEC | C26.9 | C78.89 | D01.9 | D13.99 | D37.9 | D49.0 |
| gastrocolic | C26.9 | C78.89 | D01.9 | D13.99 | D37.9 | D49.0 |
| gastrointestinal (tract) NEC | C26.9 | C78.89 | D01.9 | D13.99 | D37.9 | D49.0 |
Patient EducationClinical
Digestive Diseases
When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D37.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D37.9Overview
Is D37.9 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neoplasm of uncertain behavior of digestive organ, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D37.9 group to?
When neoplasm of uncertain behavior of digestive organ, unspecified 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 D37.9?
Under the General Equivalence Mappings, neoplasm of uncertain behavior of digestive organ, unspecified converts to ICD-9-CM 235.5 (unc behav neo GI NEC). 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.
