ICD-10 Code L24.9 – Irritant Contact Dermatitis, Unspecified Cause (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L24.9 – Irritant contact dermatitis, unspecified cause
What it is
L24.9 identifies irritant contact dermatitis when the cause is not specified in the record. It is used for skin inflammation caused by direct irritation rather than an allergic mechanism.
Clinical signs
Typical findings include localized redness, dryness, burning, itching, or scaling at the exposed skin site. Clinical features vary; refer to documentation.
When to use this code
Use L24.9 when the provider documents irritant contact dermatitis but does not identify the irritant or the specific cause is unknown. It also fits cases where the note confirms contact dermatitis from irritation, yet details are insufficient for a more specific code.
Do not use for
Do not use this code for allergic contact dermatitis or for dermatitis with a clearly documented external cause that has a more specific code. Check documentation if the record does not clearly distinguish irritant from allergic dermatitis.
Coding tip
If the irritant is named in the chart, code the more specific option instead of L24.9.