Blister (nonthermal) of unspecified upper arm, sequela

This code signifies a non-burn related blister located on an unspecified part of the upper arm, representing a late effect or complication of an earlier injury or condition. It indicates that the blister is no longer an acute event but rather a residual problem.

Apply this code when documenting a patient presenting with a blister on the upper arm that is clearly identified as a sequela of a previous trauma, infection, or other non-thermal cause. This is appropriate for conditions like a chronic blister resulting from an old friction injury or a persistent blister after a resolved skin condition.

• Ensure documentation clearly links the blister to a previous, resolved condition or injury.
• Confirm the blister is non-thermal; otherwise, a burn code would be more appropriate.
• Use this code only when a more specific site on the upper arm (e.g., shoulder, elbow) is not documented.