Blister (nonthermal), left ankle, subsequent encounter

This code indicates a non-burn related blister located on the left ankle. It signifies that the patient is presenting for follow-up care, such as wound checks, dressing changes, or evaluation of healing progress, for a previously diagnosed blister.

Use this code when a patient returns for ongoing management of a blister on their left ankle that was not caused by heat or cold. This applies to encounters where the initial treatment has already been rendered and the focus is on subsequent care.

• Ensure the documentation specifies "left ankle" and confirms the blister is "nonthermal."
• Verify the encounter is for follow-up care, not the initial presentation of the blister.
• Pair with an external cause code (V00-Y99) if the cause of the non-thermal blister is known and documented.