Blister (nonthermal) of left hand, subsequent encounter

This code signifies a non-heat-related fluid-filled lesion on the left hand, occurring during a follow-up visit for the initial injury. It indicates that the patient is receiving ongoing care for a blister that was not caused by burns or frostbite.

Apply this code when a patient presents for a subsequent visit related to a blister on their left hand that resulted from friction, pressure, or other non-thermal causes. This includes scenarios where the blister is being re-evaluated, dressed, or monitored for healing after the initial encounter.

• Ensure the blister is explicitly documented as non-thermal and located on the left hand.
• Verify that the encounter type is clearly documented as subsequent care for the existing blister.
• Do not use for initial presentations of the blister; a different seventh character would be appropriate for the initial encounter.