2026 ICD-10-CM Diagnosis Code L50.0Allergic urticaria

ICD-10-CM Codes›L00–L99›L49-L54›L50

ICD-10-CM L50.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L50.0 is a billable ICD-10-CM diagnosis code for allergic urticaria. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Allergic reactions and Other specified inflammatory condition of skin.

Code Identity

ICD-10-CM Code
L50.0
Billable Status
Yes — Valid for Submission
Code Describes
Allergic urticaria
Short Description
Allergic urticaria
Same as the full description in the CMS dataset.
Parent Code
L50
Urticaria

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL49-L54Urticaria and erythema
CategoryL50Urticaria
This CodeL50.0Allergic urticaria

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Allergic contact urticaria
  • Allergic urticaria
  • Allergic urticaria and/or angioedema
  • Allergic urticaria caused by ingested food
  • Allergic urticaria due to bite and/or sting
  • Allergic urticaria due to inhaled allergen
  • Anaphylactic urticaria
  • Contact urticaria
  • Contact urticaria caused by food
  • Harara
  • Immunologic urticaria
  • Occupational allergic contact urticaria
  • Occupational contact urticaria
  • Urticaria caused by food additive
  • Urticaria caused by salicylate
  • Urticaria medicamentosa
  • Urticarial transfusion reaction

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Allergy, allergic(reaction) (to)
      • urticaria
    • Urticaria
      • allergic
    • Urticaria
      • due to
        • drugs
    • Urticaria
      • due to
        • food
    • Urticaria
      • due to
        • inhalants

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ031
Allergic reactions
Default principal diagnosis: inpatient No · outpatient No
CCSR SKN002
Other specified inflammatory condition of skin
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Angioedema

    swelling involving the deep dermis, subcutaneous, or submucosal tissues, representing localized edema. angioedema often occurs in the face, lips, tongue, and larynx.

  • Chronic Inducible Urticaria

    chronic urticaria with identified triggering factor which is either physical, e.g., vibratory urticaria, or non-physical, e.g., aquagenic urticaria.

  • Chronic Urticaria

    wheals (urticaria) and/or angioedema presented with daily symptoms lasting for more than 6 weeks. it may be classified into chronic spontaneous and chronic inducible urticaria depending on whether a specific trigger can be linked to the development of vascular reaction.

  • Cold Urticaria

    various skin flares developing after exposure to cold temperature. while most are characterized by a limited episodic cutaneous condition characterized by urticarial wheals, such as in allergic urticaria, other types are more severe and generalized and rarely familial, e.g., cryopyrin-associated periodic syndromes.

  • Cryopyrin-Associated Periodic Syndromes

    a group of rare autosomal dominant diseases, commonly characterized by atypical urticaria (hives) with systemic symptoms that develop into end-organ damage. the atypical hives do not involve t-cell or autoantibody. cryopyrin-associated periodic syndrome includes three previously distinct disorders: familial cold autoinflammatory syndrome; muckle-wells syndrome; and cinca syndrome, that are now considered to represent a disease continuum, all caused by nlrp3 protein mutations.

  • Exercise-Induced Allergies

    allergic reactions following a period of exercise. elevated serum histamine and tryptase levels and cutaneous mast cell degranulation are often associated with post-exertional allergic reactions which sometimes are triggered only in combination with prior consumption of a specific food such as wheat. allergic symptoms produced post-exercise range from skin eruption, asthma, bronchospasm, and anaphylaxis.

  • Urticaria

    a vascular reaction of the skin characterized by erythema and wheal formation due to localized increase of vascular permeability. the causative mechanism may be allergy, infection, or stress.

  • Urticaria Pigmentosa

    the most common form of cutaneous mastocytosis (mastocytosis, cutaneous) that occurs primarily in children. it is characterized by the multiple small reddish-brown pigmented pruritic macules and papules.

  • Urticaria, Solar

    chromophore-dependent photodermatosis triggered by uv and visible light.

Patient EducationClinical

Allergy

An allergy is a reaction by your immune system to something that does not bother most other people. People who have allergies often are sensitive to more than one thing. Substances that often cause reactions are:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert L50.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
708.0 Allergic urticaria
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L50.0Overview

Is L50.0 (Urticaria) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report allergic urticaria on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L50.0 group to?

When allergic urticaria is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of L50.0?

Under the General Equivalence Mappings, allergic urticaria converts to ICD-9-CM 708.0 (allergic urticaria). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.