ICD-10 Code L10.9 – Pemphigus, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L10.9 – Pemphigus, unspecified
What it is
L10.9 identifies pemphigus when the specific type is not documented. Pemphigus is an autoimmune blistering disorder that affects the skin and sometimes the mucous membranes.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include fragile blisters, erosions, and painful skin or oral lesions, with a history consistent with pemphigus.
When to use this code
Use L10.9 when the record states pemphigus but does not specify the subtype. It also fits when the clinician documents blistering disease consistent with pemphigus and no more precise diagnosis is available. Check documentation if a named form is recorded.
Do not use for
Do not use this code for a documented pemphigus subtype such as vulgaris or foliaceus. Avoid it when the condition is another blistering disorder or when the chart does not support pemphigus.
Coding tip
Code the most specific pemphigus diagnosis documented; use L10.9 only when the subtype is not stated.