2026 ICD-10-CM Diagnosis Code K55.022Diffuse acute infarction of small intestine

ICD-10-CM Codes›K00–K95›K55-K64›K55

ICD-10-CM K55.022
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K55.022 is a billable ICD-10-CM diagnosis code for diffuse acute infarction of small intestine. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 393 through 395. Coders also document this condition as acute bowel infarction. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders and Peripheral and visceral vascular disease.

Code Identity

ICD-10-CM Code
K55.022
Billable Status
Yes — Valid for Submission
Code Describes
Diffuse acute infarction of small intestine
Short Description
Diffuse acute infarction of small intestine
Same as the full description in the CMS dataset.
Parent Code
K55.02
Acute infarction of small intestine

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK55-K64Other diseases of intestines
CategoryK55Vascular disorders of intestine
This CodeK55.022Diffuse acute infarction of small intestine

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute bowel infarction
  • Acute diffuse infarction of small intestine
  • Acute infarction of small intestine

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.

    • Infarct, infarction
      • intestine (acute) (agnogenic) (embolic) (hemorrhagic) (nonocclusive) (nonthrombotic) (occlusive) (thrombotic) (with gangrene)
        • small
          • diffuse

Clinical ClassificationClinical

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

CCSR DIG025
Other specified and unspecified gastrointestinal disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR CIR026
Peripheral and visceral vascular disease
Default principal diagnosis: inpatient No · outpatient No

Convert K55.022 to ICD-9-CMHistory

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

ICD-9-CM
557.0 Ac vasc insuff intestine
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement K55.022 replaces the following previously assigned code(s):

  • K55.0 - Acute vascular disorders of intestine
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 K55.022Overview

Is K55.022 (Acute infarction of small intestine) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report diffuse acute infarction of small intestine on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does K55.022 group to?

When diffuse acute infarction of small intestine is the principal diagnosis on an inpatient stay, it groups to MS-DRG 393, 394, 395, with relative weights from 0.6490 to 1.5993 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of K55.022?

Under the General Equivalence Mappings, diffuse acute infarction of small intestine converts to ICD-9-CM 557.0 (ac vasc insuff 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.