U.S. ICD-10-CM · FY 2027

L23 ICD-10-CM Code: Allergic contact dermatitis

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

L23

Allergic contact dermatitis

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where L23 sits

  1. 1

    Chapter 12

    Diseases of the skin and subcutaneous tissue (L00-L99)

  2. 2

    Section

    Dermatitis and eczema (L20-L30)

  3. 3

    Category L23

    Allergic contact dermatitis

  4. 4

    Code L23

    Allergic contact dermatitis

More specific choices

Codes under L23

L23 is a non-billable category. Choose the child code that best matches the documented diagnosis.

L23.0

Allergic contact dermatitis due to metals

L23.1

Allergic contact dermatitis due to adhesives

L23.2

Allergic contact dermatitis due to cosmetics

L23.3

Allergic contact dermatitis due to drugs in contact with skin

L23.4

Allergic contact dermatitis due to dyes

L23.5

Allergic contact dermatitis due to other chemical products

L23.6

Allergic contact dermatitis due to food in contact with the skin

L23.7

Allergic contact dermatitis due to plants, except food

L23.8

Allergic contact dermatitis due to other agents

L23.9

Allergic contact dermatitis, unspecified cause

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for L23.

Code first

No “code first” instruction is listed for L23.

Use additional code

No “use additional code” instruction is listed for L23.

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

  • 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)

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code L23 mean?

L23 is the FY 2027 U.S. ICD-10-CM code for “Allergic contact dermatitis.”

Is L23 a billable or specific ICD-10-CM code?

No. L23 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is L23 located in ICD-10-CM?

L23 is listed in Chapter 12, Diseases of the skin and subcutaneous tissue (L00-L99), within Dermatitis and eczema (L20-L30) (L20–L30), under category L23, Allergic contact dermatitis.

What coding notes are listed for L23?

No inclusion terms are listed for L23 in this reference record. No code-first instruction is listed. Excludes1 notes: allergy NOS (T78.40); contact dermatitis NOS (L25.9); dermatitis NOS (L30.9). Excludes2 notes: 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).

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