L23

Non-billable

Allergic contact dermatitis

L23 is the ICD-10-CM code for Allergic contact dermatitis. It is a non-billable category code — use a more specific child code such as L23.0 for billing.

Status
Header (non-billable)
Chapter
L00-L99
Subcodes
10
Edition
FY2026

L00-L99 Diseases of the skin and subcutaneous tissue

What this means — in plain language

MedlinePlus · NIH

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…

Read more about Allergy at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes1 — not coded here

  • allergy NOS (T78.40)
  • contact dermatitis NOS (L25.9)
  • dermatitis NOS (L30.9)

Excludes2 — not included here

  • dermatitis due to substances taken internally (L27.-)
  • dermatitis of eyelid (H01.1-)
  • diaper dermatitis (L22)
  • eczema of external ear (H60.5-)
  • irritant contact dermatitis (L24.-)
  • perioral dermatitis (L71.0)
  • radiation-related disorders of the skin and subcutaneous tissue (L55-L59)

Medications indicated for this condition

FDA labeling

Drugs whose FDA labeling lists this condition's category among its indications. Informational only — not a treatment recommendation or medical advice.

Conditions mapped to this code

MedlinePlus · NIH

Plain-language health-topic references grounded in MedlinePlus (NIH/NLM).

Frequently asked questions

What is ICD-10 code L23?
L23 is the ICD-10-CM code for "Allergic contact dermatitis". It falls under L00-L99 Diseases of the skin and subcutaneous tissue.
Is L23 a billable code?
No — L23 is a non-billable header code. Use a more specific child code (such as L23.0) for billing.
What are the subcodes of L23?
L23 has 10 more specific child codes, including L23.0, L23.1, L23.2.
What is excluded from L23?
Excludes1 (not coded here): allergy NOS (T78.40); contact dermatitis NOS (L25.9); dermatitis NOS (L30.9).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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