2027 ICD-10-CM Diagnosis Code K91.31Postprocedural partial intestinal obstruction
ICD-10-CM Codes›K00–K95›K90-K95›K91
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
K91.31 is a billable ICD-10-CM diagnosis code for postprocedural partial intestinal obstruction. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 388 through 390, 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 29 closely related codes. Coders also document this condition as partial obstruction of intestine. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Intestinal obstruction and ileus and Postprocedural or postoperative digestive system complication.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Partial obstruction of intestine
- Partial obstruction of intestine following procedure
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to K91.31: its own notes plus those printed at K91 and Chapter 11. A note printed at a category, block or chapter applies to every code under it.
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.
- Postprocedural incomplete intestinal obstruction
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.
- 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 K91.31, its category, or a range that includes it.
Excludes1 1
These codes carry an Excludes1 note naming K91.31: they are not reported together with it, unless the two conditions are unrelated.
Excludes2 1
These codes carry an Excludes2 note naming K91.31: 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.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
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Read the full article at MedlinePlus
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Convert K91.31 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code History & ChangesHistory
Replacement K91.31 replaces the following previously assigned code(s):
- K91.3 - Postprocedural intestinal obstruction
Questions About K91.31Overview
What is the ICD-10 code for postprocedural partial intestinal obstruction?
The ICD-10-CM code for postprocedural partial intestinal obstruction is K91.31 (sometimes written as K9131). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is K91.31 (Postprocedural intestinal obstruction) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report postprocedural partial intestinal obstruction on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does K91.31 group to?
When postprocedural partial intestinal obstruction is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 389, 388, 390, with relative weights from 0.5403 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is K91.31 a CC or MCC?
CMS lists K91.31 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 29 closely related codes in its exclusion list.
What is the ICD-9 equivalent of K91.31?
Under the General Equivalence Mappings, postprocedural partial intestinal obstruction converts to ICD-9-CM 997.49 (oth digestv system comp). The mapping is approximate, so confirm the match fits the documentation.
