2024 ICD-10-CM Diagnosis Code L50.9

Urticaria, unspecified

ICD-10-CM Code:
L50.9
ICD-10 Code for:
Urticaria, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Diseases of the skin and subcutaneous tissue
    (L00–L99)
    • Urticaria and erythema
      (L49-L54)
      • Urticaria
        (L50)

L50.9 is a billable diagnosis code used to specify a medical diagnosis of urticaria, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like L50.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Acute urticaria
  • Angioedema and/or urticaria
  • Injection site edema
  • Injection site urticaria
  • Urticaria
  • Urticarial skin test reaction
  • Wheal

Clinical Classification

Clinical CategoryCCSR Category CodeInpatient Default CCSROutpatient Default CCSR
Allergic reactionsINJ031N - Not default inpatient assignment for principal diagnosis or first-listed diagnosis.N - Not default outpatient assignment for principal diagnosis or first-listed diagnosis.
Other specified inflammatory condition of skinSKN002Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

Clinical Information

  • 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.
  • 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.

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert L50.9 to ICD-9-CM

  • ICD-9-CM Code: 708.9 - Urticaria NOS

Patient Education


Hives

Hives are red and sometimes itchy bumps on your skin. An allergic reaction to a drug or food usually causes them. Allergic reactions cause your body to release chemicals that can make your skin swell up in hives. People who have other allergies are more likely to get hives than other people. Other causes include infections and stress.

Hives are very common. They usually go away on their own, but if you have a serious case, you might need medicine or a shot. In rare cases, hives can cause a dangerous swelling in your airways, making it hard to breathe - which is a medical emergency.


[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

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.