ICD-10 Code L85.8 – Other specified epidermal thickening (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L85.8 – Other specified epidermal thickening
What it is
L85.8 is used for epidermal thickening that does not fit a more specific ICD-10 diagnosis. It covers a documented skin thickening of the outer layer, with the exact cause or pattern not otherwise classified.
Clinical signs
Typical findings include localized thickened skin, often with a rough, raised, or plaque-like surface. Clinical features vary; refer to documentation for the specific appearance, location, and any associated skin condition.
When to use this code
Use L85.8 when the record clearly states other specified epidermal thickening and no more specific code applies. It is appropriate when the provider documents epidermal thickening but does not identify a better-defined disorder. Check documentation if the note suggests a named keratinization or hyperkeratotic condition.
Do not use for
Do not use this code for general skin thickening with a more specific diagnosis available, such as callus or keratosis. Also avoid it when the documentation does not support epidermal thickening.
Coding tip
Code the most specific skin condition documented, and use L85.8 only when the provider’s wording supports a nonspecific epidermal thickening.