2026 ICD-10-CM Diagnosis Code K91.31Postprocedural partial intestinal obstruction

ICD-10-CM Codes›K00–K95›K90-K95›K91

ICD-10-CM K91.31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K91.31 is a billable ICD-10-CM diagnosis code for postprocedural partial intestinal obstruction. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 388 through 390. 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

ICD-10-CM Code
K91.31
Billable Status
Yes — Valid for Submission
Code Describes
Postprocedural partial intestinal obstruction
Short Description
Postprocedural partial intestinal obstruction
Same as the full description in the CMS dataset.
Parent Code
K91.3
Postprocedural intestinal obstruction

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK90-K95Other diseases of the digestive system
CategoryK91Intraoperative and postprocedural complications and disorders of digestive system, not elsewhere classified
This CodeK91.31Postprocedural partial intestinal obstruction

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Partial obstruction of intestine
  • Partial obstruction of intestine following procedure

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Postprocedural incomplete intestinal obstruction

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Obstruction, obstructed, obstructive
      • intestine
        • postoperative
          • incomplete
    • Obstruction, obstructed, obstructive
      • intestine
        • postoperative
          • partial

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG012
Intestinal obstruction and ileus
Default principal diagnosis: inpatient No · outpatient No
CCSR DIG024
Postprocedural or postoperative digestive system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert K91.31 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
997.49 Oth digestv system comp
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement K91.31 replaces the following previously assigned code(s):

  • K91.3 - Postprocedural intestinal obstruction
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K91.31Overview

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, 2025 through September 30, 2026.

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 388, 389, 390, with relative weights from 0.5440 to 1.4768 depending on complications. Higher weights mean higher Medicare reimbursement.

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.

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.