ICD10BillableValid for clinical use
ICD-10 Code L23.9: Allergic contact dermatitis, unspecified cause
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the skin and subcutaneous tissue (L00-L99).
When is it used?
- May be used when a clinician documents allergic contact dermatitis, unspecified cause in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
12Diseases of the skin and subcutaneous tissue (L00-L99)
block
L20-L30Dermatitis and eczema
category
L23Allergic contact dermatitis
currentL23
Official coding notes
Inclusion terms
- Allergic contact eczema NOS
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
Dermatologist
Related codes
L23.0Allergic contact dermatitis due to metalscodeL23.1Allergic contact dermatitis due to adhesivescodeL23.2Allergic contact dermatitis due to cosmeticscodeL23.3Allergic contact dermatitis due to drugs in contact with skincodeL23.4Allergic contact dermatitis due to dyescodeL23.5Allergic contact dermatitis due to other chemical productscodeL23.6Allergic contact dermatitis due to food in contact with the skincodeL23.7Allergic contact dermatitis due to plants, except foodcodeL23.8Allergic contact dermatitis due to other agentscategory
Sibling codes
L23.0Allergic contact dermatitis due to metalsbillableL23.1Allergic contact dermatitis due to adhesivesbillableL23.2Allergic contact dermatitis due to cosmeticsbillableL23.3Allergic contact dermatitis due to drugs in contact with skinbillableL23.4Allergic contact dermatitis due to dyesbillableL23.5Allergic contact dermatitis due to other chemical productsbillableL23.6Allergic contact dermatitis due to food in contact with the skinbillableL23.7Allergic contact dermatitis due to plants, except foodbillableL23.8Allergic contact dermatitis due to other agents
Coverage-related procedures and services
CPT 95065high
DIRECT NASAL MUCOUS MEMBRANE TEST
Source: CMS coverage guidance
CPT 95060high
OPHTHALMIC MUCOUS MEMBRANE TESTS
Source: CMS coverage guidance
CPT 95044high
PATCH OR APPLICATION TEST(S) (SPECIFY NUMBER OF TESTS)
Source: CMS coverage guidance
CPT 95052high
PHOTO PATCH TEST(S) (SPECIFY NUMBER OF TESTS)
Source: CMS coverage guidance
CPT 95056high
PHOTO TESTS
Source: CMS coverage guidance
CPT 86005high
ALLERGEN SPECIFIC IGE; QUALITATIVE, MULTIALLERGEN SCREEN (EG, DISK, SPONGE, CARD)
Source: CMS coverage guidance
Mapped diagnoses and classifications
SNOMED_CT 238575004high
Allergic contact dermatitis
Source: SNOMED International ICD-10 map
SNOMED_CT 724825001high
Allergic contact dermatitis caused by hairdressing product
Source: SNOMED International ICD-10 map
SNOMED_CT 870749003high
Allergic contact dermatitis caused by usnic acid
Source: SNOMED International ICD-10 map
SNOMED_CT 1251427000high
Allergic contact dermatitis of face
Source: SNOMED International ICD-10 map
SNOMED_CT 402257005high
Allergic contact dermatitis of female genitalia
Source: SNOMED International ICD-10 map
SNOMED_CT 1251428005high
Allergic contact dermatitis of foot
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
L23.9
Common synonyms
Allergic contact dermatitis, unspecified causeAllergic contact dermatitis
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.