ICD-10 Code L57.1 – Actinic reticuloid (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L57.1 – Actinic reticuloid
What it is
L57.1 identifies actinic reticuloid, a severe chronic photosensitive dermatitis. It is used when ultraviolet exposure triggers a persistent skin reaction that resembles eczema or a lymphoproliferative disorder.
Clinical signs
Patients typically have long-lasting, intense itching, redness, and thickened or lichenified skin on sun-exposed areas. Clinical features vary; refer to documentation for the exact pattern and severity.
When to use this code
Use L57.1 when the provider documents actinic reticuloid or clearly describes a chronic photosensitivity disorder with this diagnosis. It is appropriate when the record links symptoms to ultraviolet exposure and distinguishes the condition from routine sunburn or simple photodermatitis.
If the note only says “photosensitivity” or “eczema after sun exposure,” check documentation before assigning this code. Make sure the diagnosis is specific enough to support actinic reticuloid.
Do not use for
Do not use this code for uncomplicated sunburn, other dermatitis types, or nonspecific rash without a documented diagnosis. Check documentation if the chart does not clearly identify actinic reticuloid.
Coding tip
Assign L57.1 only when the provider names the condition or clearly documents the same diagnosis in equivalent terms.