2026 ICD-10-CM Diagnosis Code K55.8Other vascular disorders of intestine

ICD-10-CM Codes›K00–K95›K55-K64›K55

ICD-10-CM K55.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K55.8 is a billable ICD-10-CM diagnosis code for other vascular disorders of 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.

Code Identity

ICD-10-CM Code
K55.8
Billable Status
Yes — Valid for Submission
Code Describes
Other vascular disorders of intestine
Short Description
Other vascular disorders of intestine
Same as the full description in the CMS dataset.
Parent Code
K55
Vascular disorders of intestine

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK55-K64Other diseases of intestines
CategoryK55Vascular disorders of intestine
This CodeK55.8Other vascular disorders of intestine

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired telangiectasia of small and large intestines
  • Acute GIT vascular insufficiency
  • Acute intestinal ischemia due to obstruction of vasculature of intestine
  • Acute ischemic colitis
  • Acute vascular insufficiency of intestine
  • Angiodysplasia of gastrointestinal tract
  • Angiodysplasia of intestine
  • Angiodysplasia of small intestine
  • Gastrointestinal tract vascular insufficiency
  • Increased vascular pattern of colon
  • Insufficiency of mesenteric artery
  • Ischemic colitis
  • Superior mesenteric artery syndrome
  • Telangiectasia of colon
  • Transient ischemic colitis
  • Vascular disorder of large 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.

    • Disorder(of)
      • intestine, intestinal
        • vascular
          • specified NEC

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

Clinical InformationClinical

  • Superior Mesenteric Artery Syndrome

    duodenal obstruction by the superior mesenteric artery (mesenteric artery, superior) which travels in the root of the mesentery and crosses over the duodenum. the syndrome is characterized by the dilated proximal duodenum and stomach, bloating, abdominal cramps, and vomiting. often it is observed in patient with body casts after spinal surgery.

  • Superior Mesenteric Artery Syndrome

    a very rare syndrome characterized by compression of the third portion of the duodenum against the aorta. the compression is caused by the superior mesenteric artery. it results in complete or partial duodenal obstruction. signs and symptoms include nausea, vomiting, abdominal pain and distention, failure to gain weight, and weight loss.

Patient EducationClinical

Digestive Diseases

When you eat, your body breaks food down to a form it can use to build and nourish cells and provide energy. This process is called digestion.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert K55.8 to ICD-9-CMHistory

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

ICD-9-CM
557.9 Vasc insuff intest NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K55.8Overview

Is K55.8 (Vascular disorders of intestine) a billable code?

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

What MS-DRG does K55.8 group to?

When other vascular disorders of 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 K55.8?

Under the General Equivalence Mappings, other vascular disorders of intestine converts to ICD-9-CM 557.9 (vasc insuff intest NOS). 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.