ICD-10 Code L11.9 – Acantholytic disorder, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L11.9 – Acantholytic disorder, unspecified
What it is
L11.9 identifies an unspecified acantholytic disorder, meaning a skin condition marked by loss of cohesion between epidermal cells. Use it when the record confirms an acantholytic process but does not name a more specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Acantholytic disorders commonly involve fragile skin or blisters, erosions, or crusted lesions, but the exact pattern depends on the underlying condition.
When to use this code
Use L11.9 when the clinician documents an acantholytic disorder and the chart does not specify a named subtype. It is appropriate for final diagnoses, problem lists, or pathology-supported documentation when the condition remains unspecified.
If the note identifies a more precise disorder, code that condition instead. Check documentation when the record only mentions acantholysis without a definitive diagnosis.
Do not use for
Do not use this code for a clearly documented specific acantholytic disease or for unrelated blistering or erosive skin disorders. If the diagnosis is uncertain or incomplete, check documentation.
Coding tip
Code L11.9 only after confirming the provider has documented an unspecified acantholytic disorder, not merely a histologic finding of acantholysis.