Other specified urticaria

This code signifies forms of urticaria that do not fit into the more common categories of allergic, idiopathic, or contact urticaria. It encompasses various less frequently encountered or uniquely identified types of hives, such as cold-induced, heat-induced, solar, or aquagenic urticaria. The condition is characterized by transient, pruritic wheals and angioedema.

Use this code when the patient's medical record clearly documents a specific type of urticaria that is not classified elsewhere, such as cholinergic urticaria, pressure urticaria, or vibratory urticaria. Documentation should explicitly state the specific trigger or characteristic that differentiates it from other forms of urticaria. Avoid using this code for unspecified urticaria or clearly allergic reactions.

• Ensure the physician's documentation specifies the type of urticaria (e.g., "cold urticaria," "dermographism") to support this code.
• Do not use this code for "urticaria, unspecified" (which has a different code) or for allergic urticaria where a specific allergen is identified.
• Consider sequencing this code after any underlying systemic condition if the urticaria is a manifestation of another disease (e.g., lupus erythematosus).