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L50.0 – Allergic Urticaria: Symptoms & Treatment
L50.0 is the ICD-10 code for allergic urticaria (hives) – an immune-mediated skin reaction causing itchy welts, triggered by allergens such as food or medications.
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L50.0 is the ICD-10 code for allergic urticaria (hives) – an immune-mediated skin reaction causing itchy welts, triggered by allergens such as food or medications.
What is L50.0 – Allergic Urticaria?
L50.0 is the ICD-10 code for allergic urticaria, commonly known as allergic hives. It is an immune-mediated skin condition in which the body overreacts to specific triggers called allergens. When an allergen is encountered, mast cells in the skin release histamine and other chemical mediators, causing the characteristic itchy, raised skin lesions known as wheals or hives.
Causes and Triggers
Allergic urticaria is caused by a type I (IgE-mediated) hypersensitivity reaction. Common triggers include:
- Foods: nuts, shellfish, eggs, milk, wheat
- Medications: antibiotics (e.g., penicillin), aspirin, non-steroidal anti-inflammatory drugs (NSAIDs)
- Insect stings: bee or wasp venom
- Latex
- Animal dander and pollen (less commonly as direct skin triggers)
Symptoms
The typical symptoms of allergic urticaria include:
- Wheals: raised, red or pale skin swellings with intense itching
- Burning or heat sensation on the skin
- Angioedema: deeper swelling affecting the lips, eyelids, or tongue
- General discomfort or malaise
In severe cases, an anaphylactic reaction may occur, which is a medical emergency requiring immediate treatment.
Diagnosis
The diagnosis of allergic urticaria is established through:
- Medical history: identifying potential triggers, symptom onset, and progression
- Skin prick test: to detect specific allergic sensitivities
- Blood test: measurement of specific IgE antibodies in serum
- Provocation test: under controlled medical supervision in unclear cases
Treatment
Acute Management
The most important step is avoiding the identified allergen. Symptomatic treatment options include:
- Antihistamines (e.g., cetirizine, loratadine) as first-line therapy
- Corticosteroids (e.g., prednisolone) for severe episodes
- Adrenaline (epinephrine) for anaphylactic reactions – as emergency medication
Long-term Management
When the allergen is identified, allergen-specific immunotherapy (AIT), also called desensitization, may be recommended to reduce the immune system overreaction over time. Patients with a history of severe reactions should always carry an epinephrine auto-injector (EpiPen) as an emergency measure.
References
- Zuberbier T. et al. – The EAACI/GA²LEN/EDF/WAO guideline for the definition, classification, diagnosis and management of urticaria. Allergy, 2022.
- Bernstein J.A. et al. – The diagnosis and management of acute and chronic urticaria. Journal of Allergy and Clinical Immunology, 2014.
- World Allergy Organization (WAO) – White Book on Allergy, 2020.
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