Blister (nonthermal), left ankle, initial encounter

This diagnosis code signifies a non-heat-related fluid-filled lesion on the left ankle. It indicates the very first time this specific blister is being medically addressed. This type of blister typically arises from friction, pressure, or contact with irritants rather than burns.

Apply this code when documenting a patient's initial presentation to a healthcare provider for a blister on their left ankle that is not due to thermal injury. This is appropriate for blisters caused by ill-fitting shoes, prolonged pressure, or allergic contact dermatitis affecting the left ankle.

• Ensure the documentation clearly specifies "left ankle" and confirms the blister is nonthermal.
• Verify this is indeed the "initial encounter" for this specific injury; subsequent care would use a different encounter character.
• Look for supporting documentation regarding the cause of the blister to rule out thermal etiology.