Blister of foot and toe(s), infected

This code signifies a localized collection of fluid under the skin on the foot or toes, which has become secondarily infected by bacteria or other microorganisms. The blister itself is the primary lesion, with infection being a complication.

Apply this code when documentation clearly indicates an infected blister on any part of the foot or toes. This includes blisters that have ruptured and subsequently become infected, or intact blisters showing signs of infection (e.g., pus, erythema, warmth, pain).

• Ensure documentation specifies "infected" to differentiate from non-infected blisters.
• Do not use for blisters due to burns or frostbite; specific codes exist for those etiologies.
• Consider an additional code for the underlying cause of the blister if known and clinically relevant (e.g., friction, contact dermatitis).