ICD-10 Code K55.012 – Diffuse acute (reversible) ischemia of small intestine (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K55.012 – Diffuse acute (reversible) ischemia of small intestine
What it is
K55.012 identifies diffuse acute ischemia affecting the small intestine that is considered reversible. Use it when documentation describes widespread, sudden loss of blood flow to the small bowel without infarction.
Clinical signs
Clinical features vary; refer to documentation. Typical records may note acute abdominal pain, signs of intestinal hypoperfusion, and imaging or operative findings consistent with ischemia that has not progressed to necrosis.
When to use this code
Use this code when the provider documents diffuse acute reversible ischemia of the small intestine, or clearly describes acute small-bowel ischemia without infarction. It fits inpatient and emergency encounters where the diagnosis is confirmed clinically, radiographically, or surgically. Check documentation if the record is unclear about reversibility or extent.
Do not use for
Do not use this code for bowel infarction, chronic mesenteric ischemia, or ischemia limited to another intestinal segment. If the chart only says abdominal pain or mesenteric ischemia without small-intestine detail, check documentation.
Coding tip
Code only when the record specifically supports diffuse acute reversible small-intestine ischemia; otherwise, query for clarification.