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Compare/L23 vs L24

L23 vs L24

L23 (Allergic contact dermatitis) compared with L24 (Irritant contact dermatitis), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. L23 carries an Excludes2 note covering L24: “irritant contact dermatitis (L24.-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Yes, when both are documented. L24 carries an Excludes2 note covering L23: “allergic contact dermatitis (L23.-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

L23Allergic contact dermatitisL24Irritant contact dermatitis
Billing statusNon-billable header

Report instead: L23.0, L23.1, L23.2, L23.3, L23.4

Non-billable header

Report instead: L24.0, L24.1, L24.2, L24.3, L24.4

ClassificationL00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)
DefinitionAllergic contact dermatitis is a non-billable ICD-10-CM category code (L23).Irritant contact dermatitis is a non-billable ICD-10-CM category code (L24).
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources