Blister (nonthermal) of left thumb, initial encounter

This code signifies a non-heat-related fluid-filled lesion on the thumb of the left hand. It indicates a superficial epidermal separation, often caused by friction or pressure, without involvement of thermal injury.

Apply this code for patients presenting with a blister on their left thumb that is explicitly documented as not being caused by burns or frostbite. This is appropriate for the initial visit for treatment of such a blister.

• Ensure documentation specifies the left thumb and explicitly rules out thermal etiology.
• Confirm this is the patient's first encounter for this specific injury.
• Distinguish from other superficial injuries like abrasions or contusions.