2026 ICD-10-CM Diagnosis Code D37.1Neoplasm of uncertain behavior of stomach
ICD-10-CM Codes›C00–D49›D37-D48›D37
- Billable — Valid for Submission
- Not Chronic
D37.1 is a billable ICD-10-CM diagnosis code for neoplasm of uncertain behavior of stomach. 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 neoplasm of uncertain behavior of body of stomach. 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.
- Neoplasm of uncertain behavior of body of stomach
- Neoplasm of uncertain behavior of cardia of stomach
- Neoplasm of uncertain behavior of fundus of stomach
- Neoplasm of uncertain behavior of greater curvature of stomach
- Neoplasm of uncertain behavior of lesser curvature of stomach
- Neoplasm of uncertain behavior of pyloric antrum
- Neoplasm of uncertain behavior of pylorus
- Neoplasm of uncertain behavior of stomach
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Esophagogastric Junction
the area covering the terminal portion of esophagus and the beginning of stomach at the cardiac orifice.Pyloric Stenosis
narrowing of the pyloric canal with varied etiology. a common form is due to muscle hypertrophy (pyloric stenosis, hypertrophic) seen in infants.Pylorus
the region of the stomach at the junction with the duodenum. it is marked by the thickening of circular muscle layers forming the pyloric sphincter to control the opening and closure of the lumen.Bariatric Surgery
surgical procedures aimed at affecting metabolism and producing major weight reduction in patients with morbid obesity.Diverticulosis, Stomach
a pathological condition characterized by the presence of a number of gastric diverticula in the stomach.Diverticulum, Stomach
saccular, outward protrusion of all or a portion of the wall of the stomach.Gastric Absorption
uptake of substances via the stomach.Gastric Antral Vascular Ectasia
a distinct vascular lesion in the pyloric antrum that is characterized by tortuous dilated blood vessels (ectasia) radiating outward from the pylorus. the vessel pattern resembles the stripes on the surface of a watermelon. this lesion causes both acute and chronic gastrointestinal hemorrhage.Gastric Dilatation
abnormal distention of the stomach due to accumulation of gastric contents that may reach 10 to 15 liters. gastric dilatation may be the result of gastric outlet obstruction; ileus; gastroparesis; or denervation.Gastric Fistula
abnormal passage communicating with the stomach.Gastric Stump
that portion of the stomach remaining after gastric surgery, usually gastrectomy or gastroenterostomy for cancer of the stomach or peptic ulcer. it is a common site of cancer referred to as stump cancer or carcinoma of the gastric stump.Gastrointestinal Contents
the contents included in all or any segment of the gastrointestinal tract.Receptor-Like Protein Tyrosine Phosphatases, Class 3
a subclass of receptor-like protein tryosine phosphatases that contain a single cytosolic protein tyrosine phosphate domain and multiple extracellular fibronectin iii-like domains.Stomach
an organ of digestion situated in the left upper quadrant of the abdomen between the termination of the esophagus and the beginning of the duodenum.Stomach Diseases
pathological processes involving the stomach.Stomach Neoplasms
tumors or cancer of the stomach.Stomach Rupture
bursting of the stomach.Stomach Ulcer
ulceration of the gastric mucosa due to contact with gastric juice. it is often associated with helicobacter pylori infection or consumption of nonsteroidal anti-inflammatory drugs (nsaids).Stomach Volvulus
twisting of the stomach that may result in gastric ischemia and gastric outlet obstruction. it is often associated with diaphragmatic hernia.Stomach, Avian
a component of the digestive system of birds which consists of the gizzard and proventriculus.Stomach, Ruminant
a component of the digestive system of ruminants which consists of the abomasum; omasum; reticulum; and rumen.
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. |
|---|---|---|---|---|---|---|
| antrum (Highmore) (maxillary) › pyloric | C16.3 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| cardia (gastric) | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| cardiac orifice (stomach) | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| cardio-esophageal junction | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| cardio-esophagus | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| corpus › gastric | C16.2 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| esophagogastric junction | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| fundus | C16.1 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| fundus › stomach | C16.1 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| gastroesophageal junction | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| junction › cardioesophageal | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| junction › esophagogastric | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| junction › gastroesophageal | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| prepylorus | C16.4 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| pyloric | C16.3 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| pyloric › antrum | C16.3 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| pyloric › canal | C16.4 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| pylorus | C16.4 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach | C16.9 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › antrum (pyloric) | C16.3 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › body | C16.2 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › cardia | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › cardiac orifice | C16.0 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › corpus | C16.2 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › fundus | C16.1 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › greater curvature NEC | C16.6 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › lesser curvature NEC | C16.5 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › prepylorus | C16.4 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › pylorus | C16.4 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › wall NEC | C16.9 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › wall NEC › anterior NEC | C16.8 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
| stomach › wall NEC › posterior NEC | C16.8 | C78.89 | D00.2 | D13.1 | D37.1 | D49.0 |
Patient EducationClinical
Stomach Disorders
Your stomach is an organ between your esophagus and small intestine. It is where digestion of protein begins. The stomach has three tasks. It stores swallowed food. It mixes the food with stomach acids. Then it sends the mixture on to the small intestine.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert D37.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About D37.1Overview
Is D37.1 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neoplasm of uncertain behavior of stomach on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does D37.1 group to?
When neoplasm of uncertain behavior of stomach 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 D37.1?
Under the General Equivalence Mappings, neoplasm of uncertain behavior of stomach 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.
