Diffuse acute (reversible) ischemia of large intestine

This code signifies a widespread, acute reduction in blood flow to the large intestine that is potentially reversible. This ischemic event can lead to cellular damage and dysfunction within the colon, but without permanent tissue death (infarction). It represents a critical, yet potentially transient, compromise of the large bowel's vascular supply.

Use this code when documentation explicitly states diffuse acute (reversible) ischemia affecting the large intestine. This often presents with sudden abdominal pain, bloody diarrhea, and signs of hypoperfusion, and is supported by imaging (e.g., CT angiography) or endoscopic findings consistent with acute, non-infarcted ischemia.

• Differentiate from focal ischemia (K55.031) or ischemia with infarction (K55.01x, K55.02x).
• Ensure documentation specifies "diffuse" and "reversible" or "acute" without evidence of necrosis.
• Code any underlying cause of the ischemia (e.g., shock, vasculitis) as an additional diagnosis.