Acute ischemia of large intestine, extent unspecified

This code signifies a sudden, temporary reduction in blood flow to the large intestine that has not been specified as to the extent of the affected area. This ischemia is reversible, meaning the tissue damage is not permanent, and it can resolve with appropriate intervention. It typically presents with acute abdominal pain, often accompanied by bloody diarrhea.

Use this code for patients presenting with symptoms and diagnostic findings consistent with acute colonic ischemia where the specific segment of the large intestine involved (e.g., cecum, transverse colon) is not documented. This diagnosis is often supported by colonoscopy findings showing mucosal changes indicative of ischemia, or imaging studies (e.g., CT angiography) demonstrating reduced blood flow.

• Ensure documentation clearly states "acute" and "reversible" or implies a temporary nature of the ischemia.
• If the specific segment of the large intestine affected is documented, a more specific code from the K55.03 subcategory should be used.
• Distinguish from chronic ischemic colitis (K55.1) or infarction of the intestine (K55.0- with a more specific fourth character).