1. Home
  2. ICD-10-CM Codes
  3. L00–L99
  4. L20-L30
  5. L23
  6. 2024 ICD-10-CM Code L23.9

2024 ICD-10-CM Diagnosis Code L23.9

Allergic contact dermatitis, unspecified cause

ICD-10-CM Code:
L23.9
ICD-10 Code for:
Allergic contact dermatitis, unspecified cause
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)
    • Dermatitis and eczema
      (L20-L30)
      • Allergic contact dermatitis
        (L23)

L23.9 is a billable diagnosis code used to specify a medical diagnosis of allergic contact dermatitis, unspecified cause. 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 L23.9 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:

  • Allergic contact dermatitis
  • Allergic contact dermatitis of external auditory canal
  • Allergic contact dermatitis of face
  • Allergic contact dermatitis of female genitalia
  • Allergic contact dermatitis of foot
  • Allergic contact dermatitis of hands
  • Allergic contact dermatitis of lower leg
  • Allergic contact dermatitis of male genitalia
  • Allergic contact dermatitis of neck
  • Allergic contact dermatitis of perianal skin
  • Allergic contact dermatitis of scalp
  • Allergic contact sensitization of skin and skin-associated mucous membrane
  • Allergic contact sensitization of skin and skin-associated mucous membrane
  • Allergic contact urticaria
  • Allergic disorder of skin
  • Allergic sensitization
  • Allergic sensitization
  • Allergic vulvitis
  • Chronic contact dermatitis
  • Contact dermatitis of external ear
  • Contact dermatitis of female genitalia
  • Contact dermatitis of foot
  • Contact dermatitis of lower leg
  • Contact dermatitis of male genitalia
  • Contact dermatitis of neck
  • Contact dermatitis of perianal skin
  • Contact dermatitis of scalp
  • Contact urticaria
  • Contact urticaria
  • Contact urticaria
  • Disseminated allergic contact urticaria
  • Exacerbation of constitutional dermatitis due to occupation
  • Exacerbation of constitutional dermatitis due to occupational exposure to contact allergen
  • Lichen simplex chronicus
  • Lichenoid allergic contact dermatitis
  • Lichenoid allergic contact reaction
  • Localized allergic contact urticaria
  • Occupational allergic contact dermatitis
  • Occupational allergic contact sensitization
  • Perianal dermatitis
  • Protein contact dermatitis
  • Systemic contact dermatitis

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.
Contact dermatitisSKN005Y - 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

  • Allergic Contact Dermatitis

    an inflammatory skin condition caused by an immune response to direct contact between the skin and an allergen. it consists of a delayed type of allergic reaction at the affected site with resulting red, swollen, and blistered skin that may itch or leak.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Allergic contact eczema NOS

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 L23.9 to ICD-9-CM

  • ICD-9-CM Code: 692.9 - Dermatitis NOS
    Approximate Flag - The approximate mapping means there is not an exact match between the ICD-10 and ICD-9 codes and the mapped code is not a precise representation of the original code.

Patient Education


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:

  • Pollen
  • Dust mites
  • Mold spores
  • Pet dander
  • Food
  • Insect stings
  • Medicines

Normally, your immune system fights germs. It is your body's defense system. In most allergic reactions, however, it is responding to a false alarm. Genes and the environment probably both play a role.

Allergies can cause a variety of symptoms such as a runny nose, sneezing, itching, rashes, swelling, or asthma. Allergies can range from minor to severe. Anaphylaxis is a severe reaction that can be life-threatening. Doctors use skin and blood tests to diagnose allergies. Treatments include medicines, allergy shots, and avoiding the substances that cause the reactions.


[Learn More in MedlinePlus]

Rashes

A rash is an area of irritated or swollen skin. Many rashes are itchy, red, painful, and irritated. Some rashes can also lead to blisters or patches of raw skin. Rashes are a symptom of many different medical problems. Other causes include irritating substances and allergies. Certain genes can make people more likely to get rashes.

Contact dermatitis is a common type of rash. It causes redness, itching, and sometimes small bumps. You get the rash where you have touched an irritant, such as a chemical, or something you are allergic to, like poison ivy.

Some rashes develop right away. Others form over several days. Although most rashes clear up fairly quickly, others are long-lasting and need long-term treatment.

Because rashes can be caused by many different things, it's important to figure out what kind you have before you treat it. If it is a bad rash, if it does not go away, or if you have other symptoms, you should see your health care provider. Treatments may include moisturizers, lotions, baths, cortisone creams that relieve swelling, and antihistamines, which relieve itching.


[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.