ICD-10 Code L91.8 – Other hypertrophic disorders of the skin (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L91.8 – Other hypertrophic disorders of the skin
What it is
L91.8 identifies other specified hypertrophic skin disorders. Use it for skin thickening or overgrowth that is documented as hypertrophic but does not fit a more specific code.
Clinical signs
Clinical features vary; refer to documentation. You may see localized thickened, raised, or firm skin changes, often described as hypertrophic, without a more precise diagnosis such as a keloid or scar.
When to use this code
Use this code when the provider documents a hypertrophic disorder of the skin and no more specific ICD-10-CM option applies. It is appropriate for cases labeled “other” or “unspecified” within hypertrophic skin conditions.
Check that the note supports a skin overgrowth disorder rather than a scar, cyst, infection, or inflammatory lesion. If the documentation names a specific condition, code that diagnosis instead.
Do not use for
Do not use L91.8 for keloids, hypertrophic scars, or other separately coded skin lesions. If the record points to a different skin disorder, choose the more specific code.
Coding tip
Code only when the provider clearly documents a hypertrophic skin disorder and no better-defined diagnosis is available.