Urticaria due to cold and heat

This code signifies a specific type of urticaria (hives) that is triggered by exposure to either cold or heat stimuli. It represents a physical urticaria where the skin reaction, characterized by itchy wheals, is directly induced by temperature changes.

Use this code when documentation clearly indicates a diagnosis of urticaria where the causative agent is identified as either cold or heat. This typically applies to conditions like cold urticaria or heat urticaria, confirmed by patient history and/or provocation testing.

• Ensure documentation specifies "cold" or "heat" as the trigger; otherwise, a more general urticaria code may be appropriate.
• Do not use this code for urticaria due to other physical stimuli (e.g., pressure, sunlight); those have separate classifications.
• Consider sequencing this code after any underlying systemic condition if the urticaria is a manifestation of that condition.