ICD-10 Code K55.9 – Vascular disorder of intestine, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K55.9 – Vascular disorder of intestine, unspecified
What it is
K55.9 identifies an unspecified vascular disorder affecting the intestine. Use it when the record documents intestinal blood vessel disease or ischemia, but does not name a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly documented findings may include abdominal pain, signs of intestinal ischemia, or other evidence of impaired bowel blood flow.
When to use this code
Use K55.9 when the provider documents a vascular disorder of the intestine without further detail. It is appropriate when the chart lacks a specific site, cause, or subtype.
Apply this code for nonspecific intestinal vascular disease descriptions in inpatient or outpatient records. If the note identifies a more precise condition, code that diagnosis instead.
Do not use for
Do not use K55.9 when the documentation clearly names mesenteric ischemia, intestinal infarction, or another specified vascular disorder. Check documentation if the diagnosis is more precise.
Coding tip
Code the highest level of specificity supported by the provider’s documentation, and query when “vascular disorder” is mentioned without a clear intestinal diagnosis.