Solar urticaria

This code represents a rare form of physical urticaria characterized by the rapid development of wheals and erythema on skin exposed to ultraviolet (UV) or visible light. It is an immediate hypersensitivity reaction to light, resulting in itching, burning, and hives within minutes of exposure.

Assign this code when documentation clearly indicates a diagnosis of solar urticaria, typically following a history of light-induced skin reactions and often confirmed by phototesting. This code is appropriate for reporting the primary diagnosis when a patient presents with symptoms directly attributable to light exposure.

• Differentiate from other forms of photodermatitis or light-sensitive skin conditions, such as polymorphous light eruption (L56.4) or drug-induced photosensitivity (L56.1).
• Ensure the provider's documentation specifies "solar urticaria" to support code assignment.
• Consider any associated symptoms or complications, which may require additional codes.