ICD-10 Code L45 – Papulosquamous disorders in diseases classified elsewhere (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L45 – Papulosquamous disorders in diseases classified elsewhere
What it is
Code L45 identifies papulosquamous skin disorders that are caused by another underlying disease. Use it when the chart documents a papulosquamous eruption linked to a separate condition, not a primary skin diagnosis.
Clinical signs
These disorders usually show papules and scaly plaques on the skin. Clinical features vary; refer to documentation for the underlying disease and the described rash pattern.
When to use this code
Use L45 when the provider states the papulosquamous disorder is due to, or classified elsewhere because of, another condition. The record should connect the skin findings to the underlying diagnosis. If the cause is unclear, check documentation before coding.
Do not use for
Do not use L45 for a primary psoriasis or other standalone papulosquamous diagnosis. Do not assign it when the note only describes a rash without linking it to another disease.
Coding tip
Always code the underlying condition first when documentation supports a causal relationship.