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L50.6 Contact Urticaria – Causes & Treatment

L50.6 is the ICD-10 code for contact urticaria, a skin reaction causing hives and redness triggered by direct contact with specific substances.

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Things worth knowing about "L50.6"

L50.6 is the ICD-10 code for contact urticaria, a skin reaction causing hives and redness triggered by direct contact with specific substances.

What is L50.6 – Contact Urticaria?

The ICD-10 code L50.6 refers to contact urticaria, a form of hives (urticaria) in which skin reactions are triggered by direct contact with certain substances. Unlike other types of urticaria, the reaction occurs at the site of contact and typically develops within 30 to 60 minutes of exposure.

Causes and Triggering Substances

Contact urticaria can be caused by a wide range of substances. It is divided into two main types:

Immunological (allergic) contact urticaria: Triggered by an IgE-mediated allergic response to substances such as natural latex, animal proteins, foods (e.g., fish, nuts), plants, or cosmetic ingredients.
Non-immunological contact urticaria: Occurs without immune system involvement through direct release of mediators such as histamine. Common triggers include stinging nettles, cinnamon, benzoic acid, or certain preservatives.
Unknown mechanism: In some cases, the exact mechanism cannot be clearly identified.

Symptoms

Symptoms of contact urticaria are usually limited to the area of contact but may spread in severe cases:

Itching, burning, or tingling at the affected skin site
Redness (erythema) of the skin
Wheals (raised, whitish-red swellings)
Swelling (oedema) in the affected area
In severe cases: systemic reactions such as rhinitis, conjunctivitis, asthma, or – rarely – anaphylactic shock

Diagnosis

Diagnosis of contact urticaria is primarily clinical, supported by specific tests:

Medical history: Detailed inquiry into triggers, time course, and previous reactions
Patch test: Used to identify contact allergies
Prick test and RAST/EAST: Indicated when an IgE-mediated reaction is suspected
Provocation test: Controlled skin contact with the suspected substance under medical supervision

Treatment

The most important measure is avoiding the triggering substance. Additional treatment options include:

Antihistamines (H1-blockers): Relieve itching and wheal formation; considered first-line treatment
Corticosteroids: Can be used short-term for pronounced or systemic reactions
Adrenaline (epinephrine): Essential in cases of anaphylaxis; affected individuals should carry an emergency kit
Skin care products and protective barriers: To prevent skin contact (e.g., protective gloves for occupational exposure)

Special Considerations and Risks

Contact urticaria is particularly relevant in occupational settings, such as among healthcare workers (latex allergy), food handlers, or hairdressers. Early diagnosis and consistent allergen avoidance are essential to prevent worsening or systemic reactions. Individuals with known contact urticaria to latex or food proteins have an elevated risk of severe anaphylactic reactions.

References

Magerl M. et al. – German Guidelines on Urticaria (Deutsche Dermatologische Gesellschaft, DDG), 2022.
Zuberbier T. et al. – The EAACI/GA²LEN/EDF/WAO guideline for the definition, classification, diagnosis and management of urticaria. Allergy, 2022.
Gimenez-Arnau A. et al. – Contact urticaria syndrome. In: Contact Dermatitis (Johanssen J.D. et al., eds.), Springer, 2021.

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