Blister (nonthermal), unspecified foot, subsequent encounter

This code signifies a non-burn related blister located on an unspecified part of the foot, indicating that the patient is receiving follow-up care for this condition. This could include blisters caused by friction, allergic reactions, or other non-thermal etiologies.

Apply this code when a patient presents for ongoing management, dressing changes, or evaluation of a previously diagnosed non-thermal foot blister. This is appropriate for visits following the initial encounter where the blister was first identified and treated.

• Ensure the documentation clearly states the encounter is for follow-up care of a foot blister.
• Verify the blister is explicitly documented as non-thermal; otherwise, a burn code may be more appropriate.
• If the specific foot (left or right) is documented, use a more specific code from the S90.82- series.