Blister of trunk, infected

This code signifies a blister located on the patient's trunk (torso), which has become secondarily infected. The infection typically presents with signs such as erythema, warmth, pain, purulent discharge, or fever, superimposed on the original blister formation.

Apply this code when documentation clearly indicates an infected blister on the chest, back, abdomen, or flank. Supporting documentation should specify both the presence of a blister and clinical signs or a physician's statement confirming infection.

• Ensure the anatomical site is explicitly documented as the trunk; avoid using for blisters on extremities or head/neck.
• Distinguish from non-infected blisters; if no infection is present, a different code for an uninfected blister would be appropriate.
• Consider an additional code for the underlying cause of the blister (e.g., burn, insect bite) if known and documented.