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L50.4 Cold Urticaria – Causes and Treatment

L50.4 is the ICD-10 code for cold urticaria, a skin condition triggered by cold stimuli such as cold air, water, or objects, causing hives and itching.

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Things worth knowing about "L50.4"

L50.4 is the ICD-10 code for cold urticaria, a skin condition triggered by cold stimuli such as cold air, water, or objects, causing hives and itching.

Definition and ICD-10 Code L50.4

L50.4 is the ICD-10 diagnosis code for cold urticaria (also known as cold-induced urticaria or cold hives). It is a form of physical urticaria in which cold stimuli trigger an allergic or pseudo-allergic skin reaction. The condition belongs to the group of physical urticaria disorders and can significantly impact quality of life.

Causes and Triggers

Cold urticaria occurs due to an exaggerated response of mast cells in the skin to cold stimuli. This causes the release of histamine and other inflammatory mediators, leading to the characteristic skin changes.

Contact with cold water (e.g., swimming, showering)
Cold air or wind
Touching cold objects or surfaces
Consuming cold food or drinks (lips and throat may be affected)

A distinction is made between primary (idiopathic) cold urticaria, where no underlying disease is identified, and secondary cold urticaria, which may be associated with conditions such as cryoglobulinemia, infections, or autoimmune diseases.

Symptoms

Typical symptoms appear within minutes of cold exposure and usually resolve within 30 to 60 minutes:

Wheals (raised, reddened skin patches with a pale center)
Intense itching and burning sensation
Swelling, particularly of the lips, eyelids, and throat (angioedema)
In severe cases: dizziness, drop in blood pressure, difficulty breathing – up to and including anaphylactic shock (especially when swimming in cold water)

Diagnosis

Cold urticaria is generally diagnosed clinically. A simple ice cube test is the standard procedure: an ice cube is placed on the forearm for 5 minutes, and a wheal forming after rewarming confirms the diagnosis.

Medical history (timing, triggers, course of symptoms)
Provocation test with an ice cube or cold stimulus device (TempTest®)
Blood tests to rule out secondary causes (e.g., cryoglobulins, ANA, infection serology)

Treatment

Treatment of cold urticaria depends on the severity of the condition:

General Measures

Consistent avoidance of cold stimuli
Wearing warm clothing
Avoiding cold food and drinks

Pharmacological Treatment

Non-sedating second-generation H1 antihistamines (e.g., cetirizine, loratadine, bilastine) are the first-line treatment and reduce itching and wheal formation.
In cases of insufficient response: dose increase or switching to a different antihistamine.
Omalizumab (anti-IgE monoclonal antibody) is an approved option for severe, treatment-resistant cold urticaria.
Patients with severe symptoms should carry an emergency kit with an adrenaline auto-injector.

Prognosis

In many patients, cold urticaria improves spontaneously over time. Studies suggest that approximately 50% of patients experience remission within 5 years. Regular medical follow-up is recommended.

References

Zuberbier T. et al.: The international EAACI/GA2LEN/EuroGuiDerm/APAAACI guideline for the definition, classification, diagnosis, and management of urticaria. Allergy, 2022; 77(3):734–766.
Magerl M. et al.: AWMF Guideline on the Definition, Classification, Diagnosis and Therapy of Urticaria, 2022.
World Allergy Organization (WAO): Cold Urticaria – Classification and Management Overview, 2021.

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