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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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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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