ICD-10 Code K55.011 – Focal (segmental) acute (reversible) ischemia of small intestine (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K55.011 – Focal (segmental) acute (reversible) ischemia of small intestine
What it is
K55.011 identifies a localized, sudden reduction in blood flow to part of the small intestine that is described as reversible. Use it when the record specifically documents focal or segmental acute ischemia of the small bowel.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include acute abdominal pain, tenderness, and imaging or operative evidence of a limited ischemic segment without established bowel necrosis.
When to use this code
Use this code when the provider documents focal or segmental acute reversible ischemia of the small intestine. It is appropriate for confirmed small-bowel ischemia limited to a defined segment, whether identified by imaging, surgery, or specialist assessment. Check documentation if the record only says mesenteric ischemia or bowel ischemia without site or acuity.
Do not use for
Do not use this code for chronic mesenteric ischemia, bowel infarction, or ischemia involving the colon or stomach. If the note does not specify the small intestine or reversibility, check documentation.
Coding tip
Code the documented anatomic site and acuity exactly; if the record is vague, query for whether the ischemia is focal, acute, reversible, and limited to the small intestine.