Blister (nonthermal) of unspecified thumb, initial encounter

This diagnosis code signifies a non-burn related blister located on an unspecified thumb. It indicates the initial presentation of this injury, meaning the patient is receiving active treatment for the blister.

This code is appropriate for documenting a patient's first visit for a blister on their thumb caused by friction, pressure, or other non-thermal means. Examples include blisters from repetitive tasks, ill-fitting gloves, or minor trauma where a burn is ruled out.

• Ensure documentation clearly states the blister is non-thermal and located on the thumb.
• Verify that this is the initial encounter for treatment; subsequent encounters will require a different seventh character.
• If the specific thumb (right or left) is documented, a more specific code should be used.