L50.9
Urticaria, unspecified
Diseases of the skin and subcutaneous tissue Billable
Quick Reference
Hives or welts on skin without specification of acute vs chronic or trigger
Clinical Information
When to Use This Code
Hives or welts on skin without specification of acute vs chronic or trigger
Common Clinical Scenarios
- Acute urticaria/hives
- Allergic reaction with hives
- Antihistamine prescribing
- Chronic idiopathic urticaria
Documentation Requirements
- Document distribution and appearance of hives
- Record duration (acute <6 weeks, chronic ≥6 weeks)
- Note triggers if identified (food, medication, physical)
- Specify response to antihistamines
Coding Guidelines
Inclusion Terms
These terms are included in this code:
HivesUrticaria NOSWheals
Exclusion Terms
Do NOT use this code for:
- Angioedema (T78.3)
- Anaphylaxis (T78.2)
- Drug-induced urticaria (use drug code + L50.0)
Coding Notes
Acute urticaria (<6 weeks) often allergic
Chronic urticaria (≥6 weeks) usually idiopathic
Consider autoimmune workup if chronic
Related ICD-10 Codes
Consider these related codes based on patient presentation:
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Code
L50.9
Category
Diseases of the skin and subcutaneous tissue
Billable Status
Billable
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