Blister (nonthermal) of unspecified finger, init encntr

This code signifies a non-thermal blister located on an unspecified finger. This injury is in its initial phase of treatment, meaning the patient is receiving active care for the blister.

Apply this code when documenting a patient presenting with a blister on any finger that is not caused by heat, cold, or chemical exposure. This is appropriate for the first encounter where the blister is diagnosed and treatment initiated.

• Ensure the documentation clearly states the blister is non-thermal and the specific finger is not identified.
• Confirm this is the initial encounter for this specific injury; subsequent encounters will require a different seventh character.
• If the cause of the blister is known (e.g., friction from a tool), consider if a more specific external cause code is also warranted.