ICD-10 Code L50.6 – Contact urticaria (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L50.6 – Contact urticaria
What it is
Use this code for hives that appear after direct skin contact with a triggering substance. It describes an immediate urticarial reaction limited to contact exposure, not a generalized allergic rash.
Clinical signs
Typical findings include localized wheals, redness, itching, and swelling at the site of contact. Clinical features vary; refer to documentation if the record does not clearly identify a contact-triggered urticarial reaction.
When to use this code
Assign L50.6 when the provider documents contact urticaria, such as hives developing after exposure to a specific material, chemical, or other irritant/allergen. Use it when the reaction is described as immediate and linked to contact rather than ingestion, inhalation, or an unspecified cause. Check documentation if the trigger or timing is unclear.
Do not use for
Do not use this code for nonspecific urticaria, chronic urticaria, or allergic reactions without documented contact exposure. If the record only says “rash” or “dermatitis,” verify the diagnosis before coding.
Coding tip
Look for explicit documentation of both contact exposure and urticaria before assigning L50.6.