ICD-10 Code K55.031 – Focal (segmental) acute (reversible) ischemia of large intestine (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K55.031 – Focal (segmental) acute (reversible) ischemia of large intestine
What it is
This code identifies a localized, acute episode of reduced blood flow affecting part of the large intestine. The “reversible” wording indicates ischemia that may improve if recognized promptly.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include abdominal pain, tenderness, and other signs of colonic ischemia confirmed by imaging, endoscopy, or operative notes.
When to use this code
Use K55.031 when the record clearly documents focal or segmental acute reversible ischemia of the large intestine. It is appropriate when the provider specifies the anatomic site and acute ischemic process. If the note only says “ischemic colitis,” check documentation for a more specific diagnosis.
Do not use for
Do not use this code for chronic intestinal ischemia, nonreversible bowel infarction, or ischemia limited to the small intestine. Check documentation if the site, acuity, or reversibility is unclear.
Coding tip
Code only when the provider documents both the large-intestine location and the focal, acute, reversible nature of the ischemia.