2026 ICD-10-CM Diagnosis Code K31.0Acute dilatation of stomach
ICD-10-CM Codes›K00–K95›K20-K31›K31
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
K31.0 is a billable ICD-10-CM diagnosis code for acute dilatation of stomach. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 1 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified disorders of stomach and duodenum.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute dilatation of stomach
- Bouchard's disease
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Acute distention of stomach
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
Gastrectasis K31.0
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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 K31.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About K31.0Overview
What is the ICD-10 code for acute dilatation of stomach?
The ICD-10-CM code for acute dilatation of stomach is K31.0 (sometimes written as K310). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is K31.0 (Other diseases of stomach and duodenum) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report acute dilatation of stomach on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does K31.0 group to?
When acute dilatation of stomach is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, 791, 793, with relative weights from 0.7796 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K31.0 a CC or MCC?
CMS lists K31.0 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 1 closely related codes in its exclusion list.
What is the ICD-9 equivalent of K31.0?
Under the General Equivalence Mappings, acute dilatation of stomach converts to ICD-9-CM 536.1 (ac dilation of stomach). The mapping is a direct match.
