Blister (nonthermal) of left index finger, initial encounter

This code signifies a fluid-filled lesion on the left index finger that is not caused by heat or cold exposure. It represents a localized collection of serous fluid under the epidermis, resulting from friction, pressure, or other non-thermal trauma.

Apply this code when documenting a patient's first presentation for a blister on their left index finger due to causes like repetitive rubbing, pinching, or chemical irritation. It is appropriate for initial evaluations and treatment of such non-burn related skin injuries.

• Ensure the documentation clearly specifies the left index finger and a non-thermal etiology.
• Confirm this is the patient's first encounter for this specific injury; subsequent care would use a different encounter character.
• Distinguish from blisters caused by burns (T23.xx) or frostbite (T34.xx).