Blister of elbow, forearm, and wrist, infected

This code signifies an infected fluid-filled lesion (blister) located on the elbow, forearm, or wrist. The infection indicates a secondary bacterial involvement of the blister.

Apply this code when documentation specifies a blister on the specified upper extremity areas with clear signs of infection (e.g., erythema, purulent drainage, warmth, tenderness). This is typically seen following trauma, burns, or insect bites where the blister subsequently becomes infected.

• Ensure documentation explicitly states "infected" in relation to the blister.
• If the underlying cause of the blister (e.g., burn, insect bite) is known, code it as a primary diagnosis if appropriate, followed by this code.
• Distinguish from non-infected blisters, which would be coded differently.