Blister (nonthermal) of left thumb, subsequent encounter

This code signifies a non-burn related fluid-filled lesion on the left thumb that is being treated or evaluated after the initial encounter. This could result from friction, pressure, or other mechanical trauma, and the blister is not due to heat, cold, or chemical exposure.

Use this code when a patient presents for follow-up care, such as wound checks, dressing changes, or further evaluation, for a blister on their left thumb that was not caused by a thermal injury. This applies to situations where the initial injury has already been documented.

• Ensure documentation specifies the left thumb and confirms the non-thermal etiology of the blister.
• The "D" seventh character indicates a subsequent encounter, meaning the patient is receiving routine care during the healing phase.
• Do not use for initial treatment of the injury; refer to the acute phase code for the first encounter.