L24 vs L25.9
L24 (Irritant contact dermatitis) compared with L25.9 (Unspecified contact dermatitis, unspecified cause), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. L24 carries an Excludes1 note covering L25.9: “contact dermatitis NOS (L25.9)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. L25.9 carries an Excludes1 note covering L24: “irritant contact dermatitis (L24.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| L24Irritant contact dermatitis | L25.9Unspecified contact dermatitis, unspecified cause | |
|---|---|---|
| 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 | Irritant contact dermatitis is a non-billable ICD-10-CM category code (L24). | Unspecified contact dermatitis, unspecified cause is a billable ICD-10-CM diagnosis code (L25.9). |
| Includes | — | Contact dermatitis (occupational) NOS Contact eczema (occupational) NOS |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources