ICD-10 Code L40.3 – Pustulosis palmaris et plantaris (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L40.3 – Pustulosis palmaris et plantaris
What it is
L40.3 identifies pustulosis palmaris et plantaris, a chronic inflammatory skin disorder with recurrent sterile pustules on the palms and soles. It is coded when documentation names this specific condition.
Clinical signs
Typical findings include crops of small pustules, scaling, redness, and crusting on the palms, soles, or both. Clinical features vary; refer to documentation if the record does not clearly describe the distribution or appearance.
When to use this code
Use L40.3 when the provider documents pustulosis palmaris et plantaris, palmoplantar pustulosis, or an equivalent diagnosis. Code it from dermatology notes, problem lists, or discharge summaries when the condition is confirmed. Check documentation if the note only says “rash” or “pustules” without a specific diagnosis.
Do not use for
Do not use this code for nonspecific dermatitis, infection-related pustules, or other psoriasis types unless the record specifically supports this diagnosis. Check documentation when the cause or site is unclear.
Coding tip
Code the documented diagnosis, not the symptom pattern, and verify whether the provider uses an alternate name for palmoplantar pustulosis.