L23 vs L24.A1
L23 (Allergic contact dermatitis) compared with L24.A1 (Irritant contact dermatitis due to saliva), 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.A1: “irritant contact dermatitis (L24.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. L24.A1 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 dermatitis | L24.A1Irritant contact dermatitis due to saliva | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) |
| Definition | Allergic contact dermatitis is a non-billable ICD-10-CM category code (L23). | Irritant contact dermatitis due to saliva is a billable ICD-10-CM diagnosis code (L24.A1). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources