ICD-10 Code K55.021 – Focal (segmental) acute infarction of small intestine (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K55.021 – Focal (segmental) acute infarction of small intestine
What it is
This code identifies a localized area of dead small-bowel tissue caused by loss of blood flow. Use it when documentation specifies an acute focal or segmental infarction of the small intestine.
Clinical signs
Typical findings include sudden abdominal pain, tenderness, and signs of bowel ischemia or peritonitis. Clinical features vary; refer to documentation for imaging, operative, or pathology confirmation.
When to use this code
Use K55.021 when the record clearly states focal or segmental acute infarction of the small intestine. It may be supported by imaging, surgery, or pathology showing ischemic necrosis limited to a small-bowel segment. Code the documented condition, not suspected ischemia alone.
Do not use for
Do not use this code for chronic mesenteric ischemia, nonspecific abdominal pain, or infarction involving other bowel locations. Check documentation if the record only says bowel ischemia or necrosis without small-intestine specificity.
Coding tip
Match the code to the exact anatomic site and acuity stated in the chart.