Blister (nonthermal) of unsp back wall of thorax, init

This code signifies a non-burn related blister located on an unspecified area of the back of the torso. This injury involves the superficial layers of the skin, resulting in a fluid-filled lesion without evidence of thermal damage.

Use this code for initial encounters involving blisters on the back caused by friction, pressure, or other non-thermal mechanisms. Examples include blisters from ill-fitting clothing, prolonged pressure, or chemical irritants, where the specific location on the back is not documented.

• Ensure documentation clearly states the blister is non-thermal.
• Only use this code when the specific back wall (e.g., scapular region, lumbar region) is not specified in the medical record.
• Remember the "A" suffix indicates an initial encounter for this injury.