ICD-10 Code L43.1 – Bullous lichen planus (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L43.1 – Bullous lichen planus
What it is
L43.1 identifies bullous lichen planus, a blistering form of lichen planus. Use it when documentation specifies lichen planus with bullae or vesicles.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include pruritic, violaceous lichen planus lesions with blister formation on or around affected skin.
When to use this code
Use this code when the provider documents bullous lichen planus, including cases described as lichen planus with bullae. It is appropriate when the blistering variant is clearly identified in the assessment or problem list. Check documentation if the note only says lichen planus without specifying the bullous form.
Do not use for
Do not use it for ordinary lichen planus without blistering or for other blistering disorders. If the record is unclear, check documentation rather than assuming this subtype.
Coding tip
Code L43.1 only when the chart explicitly supports the bullous subtype.