Blister (nonthermal), right thigh, sequela

This code describes a non-heat-related blister located on the patient's right thigh, indicating that the blister is a residual effect or complication of a previous injury or condition. It signifies that the original acute phase of the blister has passed, and the current presentation is a long-term consequence.

Use this code when documenting a patient presenting with a chronic or residual blister on the right thigh that is not due to a burn or frostbite. This is appropriate for follow-up encounters where the blister is a persistent issue stemming from an earlier, resolved acute event.

• Ensure documentation clearly states the blister is on the right thigh and is not thermally induced.
• The "S" seventh character indicates a sequela, meaning this code is used for complications or conditions arising directly from a previous injury or disease.
• Always link this sequela code to an external cause code (V00-Y99) if the original cause of the blister is known and documented.