ICD-10 Code L51.2 – Toxic epidermal necrolysis [Lyell] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L51.2 – Toxic epidermal necrolysis [Lyell]
What it is
L51.2 identifies toxic epidermal necrolysis, a severe skin reaction with widespread epidermal detachment. It is a medical emergency and is often documented with extensive mucosal involvement.
Clinical signs
Typical findings include painful skin, blistering, and large areas of sheet-like peeling. Clinical features vary; refer to documentation for extent of skin and mucosal involvement.
When to use this code
Use L51.2 when the provider documents toxic epidermal necrolysis or Lyell syndrome. Code it when the record clearly supports this diagnosis, even if the triggering cause is also noted.
If the chart only says severe rash, drug reaction, or Stevens-Johnson syndrome, do not assume TEN. Check documentation for the exact diagnosis and whether overlap or alternative coding is specified.
Do not use for
Do not use this code for uncomplicated erythema multiforme, nonspecific dermatitis, or a drug eruption without TEN. Check documentation if the diagnosis is uncertain.
Coding tip
Verify the provider’s exact wording, because Stevens-Johnson syndrome and toxic epidermal necrolysis are not interchangeable in coding.