ICD-10 Code L43.2 – Lichenoid drug reaction (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L43.2 – Lichenoid drug reaction
What it is
Lichenoid drug reaction is a skin eruption that resembles lichen planus but is caused by a medication. You should code it when the record identifies a drug-related lichenoid dermatitis or reaction.
Clinical signs
Typical findings include pruritic, violaceous, flat-topped papules or plaques, sometimes with a generalized distribution. Clinical features vary; refer to documentation for the specific rash pattern and suspected medication.
When to use this code
Use this code when the clinician documents a lichenoid drug eruption, lichenoid dermatitis due to a medication, or a similar drug-induced lichenoid reaction. Apply it when the diagnosis is confirmed or clearly stated in the note. If the record only says “rash” or “drug rash,” check documentation.
Do not use for
Do not use this code for idiopathic lichen planus or other non-drug-related lichenoid disorders. If the cause is unclear, check documentation before assigning L43.2.
Coding tip
Look for the word “drug-induced” or a named medication in the assessment to support L43.2.