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L50.3 Cold Urticaria – Causes, Symptoms, Treatment

L50.3 is the ICD-10 code for cold urticaria, a physical allergic skin reaction causing hives, itching, and swelling after exposure to cold temperatures.

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Things worth knowing about "L50.3"

L50.3 is the ICD-10 code for cold urticaria, a physical allergic skin reaction causing hives, itching, and swelling after exposure to cold temperatures.

What is L50.3 – Cold Urticaria?

The ICD-10 code L50.3 refers to cold urticaria (also known as urticaria e frigore), a form of physical urticaria in which the skin reacts to cold stimuli – such as cold air, cold water, or contact with cold objects – by developing hives, redness, and itching. In severe cases, systemic reactions may also occur.

Causes

The exact cause of cold urticaria is not always clearly identifiable. Two main forms are distinguished:

Primary (idiopathic) cold urticaria: The most common form, in which no specific underlying disease can be identified. Cold stimuli are thought to trigger the release of histamine and other inflammatory mediators from mast cells in the skin.
Secondary cold urticaria: Less common, triggered by underlying conditions such as cryoglobulinemia, cold agglutinin disease, infections (e.g., mononucleosis, hepatitis), or other systemic diseases.

Symptoms

Symptoms typically appear within minutes of cold exposure and resolve after the skin warms up:

Hives (wheals) and skin redness at exposed areas
Itching and burning sensation of the skin
Swelling (angioedema), especially of the lips or eyelids
In severe cases: dizziness, palpitations, drop in blood pressure, or anaphylactic shock (e.g., when swimming in cold water)

Diagnosis

Diagnosis of cold urticaria is primarily clinical, supported by the ice cube test:

An ice cube is placed on the forearm for two to five minutes. A positive result is indicated by the appearance of a wheal after the skin rewarms.
Blood tests may be performed to rule out secondary causes (e.g., cryoglobulins, cold agglutinins, inflammatory markers).
A thorough medical history is essential.

Treatment

Treatment of cold urticaria aims to relieve symptoms and prevent severe reactions:

General Measures

Avoiding cold stimuli as much as possible
Wearing protective clothing in cold environments
Avoiding swimming in cold water without prior medical evaluation

Pharmacological Treatment

Antihistamines (H1 blockers): First-line treatment, e.g., cetirizine, loratadine, or fexofenadine. These medications block the effects of histamine and reduce hives and itching.
Omalizumab: A monoclonal antibody used in severe or treatment-resistant cold urticaria.
Emergency kit: Patients with severe reactions should carry an emergency kit including an epinephrine auto-injector, antihistamine, and corticosteroid.

Treatment of Secondary Causes

When cold urticaria is secondary, treating the underlying condition is the primary therapeutic goal.

Course and Prognosis

In many patients, primary cold urticaria resolves spontaneously after several years. Regular medical follow-up is still recommended. Severe systemic reactions, particularly during swimming, can be life-threatening and require special precaution.

References

Magerl, M. et al. – S3 Guideline Urticaria, German Dermatological Society (DDG), 2022.
Zuberbier, T. et al. – The EAACI/GA2LEN/EDF/WAO guideline for the definition, classification, diagnosis and management of urticaria. Allergy, 2022.
World Allergy Organization (WAO) – Cold Urticaria: Classification and Diagnostic Criteria, 2021.

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