ICD-10 Code L50.0 – Allergic urticaria (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L50.0 – Allergic urticaria
What it is
L50.0 identifies urticaria triggered by an allergic reaction, commonly called hives. It describes a skin condition with transient wheals caused by exposure to an allergen.
Clinical signs
Typical findings include itchy, raised, pale or red wheals that appear suddenly and may change location. Clinical features vary; refer to documentation.
When to use this code
Use L50.0 when the provider documents allergic urticaria or hives due to a specific or suspected allergen. This code fits encounters where the allergic cause is stated in the record. If the note only says urticaria without an allergic link, check documentation.
Do not use for
Do not use this code for nonallergic urticaria, chronic idiopathic urticaria, or angioedema alone. Check documentation when the cause is unclear.
Coding tip
Code L50.0 only when the allergic relationship is documented, not inferred from rash or itching alone.