2027 ICD-10-CM Diagnosis Code K31.5Obstruction of duodenum
ICD-10-CM Codes›K00–K95›K20-K31›K31
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
K31.5 is a billable ICD-10-CM diagnosis code for obstruction of duodenum. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 380 through 382. 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 15 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Intestinal obstruction and ileus.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute duodenal ulcer with hemorrhage
- Acute duodenal ulcer with hemorrhage AND obstruction
- Acute duodenal ulcer with hemorrhage AND perforation
- Acute duodenal ulcer with hemorrhage, with perforation AND with obstruction
- Acute duodenal ulcer with obstruction
- Acute duodenal ulcer with perforation
- Acute duodenal ulcer with perforation AND obstruction
- Acute duodenal ulcer without hemorrhage AND without perforation
- Acute duodenal ulcer without hemorrhage AND without perforation but with obstruction
- Acute peptic ulcer with hemorrhage AND obstruction
- Acute peptic ulcer with hemorrhage and perforation
- Acute peptic ulcer with hemorrhage, with perforation AND with obstruction
- Acute peptic ulcer with perforation AND obstruction
- Chronic duodenal ileus
- Chronic duodenal ulcer with hemorrhage
- Chronic duodenal ulcer with hemorrhage AND obstruction
- Chronic duodenal ulcer with hemorrhage AND perforation
- Chronic duodenal ulcer with hemorrhage, with perforation AND with obstruction
- Chronic duodenal ulcer with obstruction
- Chronic duodenal ulcer with perforation
- Chronic duodenal ulcer with perforation AND obstruction
- Chronic duodenal ulcer without hemorrhage AND without perforation
- Chronic duodenal ulcer without hemorrhage AND without perforation but with obstruction
- Chronic peptic ulcer with hemorrhage AND obstruction
- Chronic peptic ulcer with hemorrhage AND perforation
- Chronic peptic ulcer with hemorrhage, with perforation AND with obstruction
- Chronic peptic ulcer with perforation AND obstruction
- Duodenal papillary stenosis
- Duodenal scar
- Duodenal ulcer with hemorrhage AND obstruction
- Duodenal ulcer with hemorrhage AND perforation
- Duodenal ulcer with hemorrhage, with perforation AND with obstruction
- Duodenal ulcer with perforation AND obstruction
- Duodenal ulcer without hemorrhage AND without perforation
- Duodenal ulcer without hemorrhage AND without perforation but with obstruction
- Intestinal volvulus
- Obstruction of duodenum
- Peptic ulcer with hemorrhage, with perforation AND with obstruction
- Stenosis of duodenum
- Stricture of duodenum
- Stricture of small intestine
- Volvulus of duodenum
- Volvulus of small intestine
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K31.5: its own notes plus those printed at K31, block K20-K31, and Chapter 11. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- functional disorders of stomach
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Constriction of duodenum
- Duodenal ileus (chronic)
- Stenosis of duodenum
- Stricture of duodenum
- Volvulus of duodenum
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- congenital stenosis of duodenum (Q41.0)
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- hiatus hernia (K44.-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name K31.5, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming K31.5: they are not reported together with it, unless the two conditions are unrelated.
- K56 Paralytic ileus and intestinal obstruction without herniaobstruction of duodenum (K31.5)
Excludes2 2
These codes carry an Excludes2 note naming K31.5: its condition is not part of those codes, and both may be reported when the patient has both.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Cicatrix (adherent) (contracted) (painful) (vicious) See Also: Scar; L90.5
Constriction See Also: Stricture;
duodenum K31.5
Scar, scarring See Also: Cicatrix; L90.5
duodenum, obstructive K31.5
Stenosis, stenotic (cicatricial) See Also: Stricture;
duodenum K31.5
Syndrome See Also: Disease;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Intestinal Obstruction
An intestinal obstruction occurs when food or stool cannot move through the intestines. The obstruction can be complete or partial. There are many causes. The most common are adhesions, hernias, cancers, and certain medicines.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert K31.5 to ICD-9-CMHistory
Code HistoryHistory
Questions About K31.5Overview
What is the ICD-10 code for obstruction of duodenum?
The ICD-10-CM code for obstruction of duodenum is K31.5 (sometimes written as K315). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is K31.5 (Other diseases of stomach and duodenum) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report obstruction of duodenum on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does K31.5 group to?
When obstruction of duodenum is the principal diagnosis on an inpatient stay, it groups to MS-DRG 381, 380, 382, with relative weights from 0.7283 to 1.9243 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K31.5 a CC or MCC?
CMS lists K31.5 as a CC (complication or comorbidity) for FY 2027. 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 15 closely related codes in its exclusion list.
Can K31.5 be reported with Q41.0?
Not as a rule. The Excludes1 note on K31.5 lists "congenital stenosis of duodenum (Q41.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
