L51.2

Billable

Toxic epidermal necrolysis [Lyell]

HCC Category Mapping

V24HCC 162 — Severe Skin Burn or Condition

0.517

ESRDHCC 162 — Severe Skin Burn or Condition

0.000

What This Code Means

A life-threatening condition involving widespread blistering and peeling of the skin and mucous membranes, usually triggered by medications or infections, requiring intensive medical care.

Coding Tips

•Toxic epidermal necrolysis (TEN) is a medical emergency with high mortality; document the percentage of body surface area affected
•Identify the causative agent (typically medications like antibiotics, NSAIDs, or anticonvulsants) and document systemic involvement

Clinical Significance

Toxic epidermal necrolysis (TEN, Lyell syndrome) is the most severe form of drug-induced skin reaction, characterized by widespread epidermal detachment affecting more than 30% of body surface area. It is a dermatologic emergency with mortality rates of 25-35%, requiring burn unit-level care. Survivors face significant long-term complications. Accurate coding captures the extreme resource utilization and morbidity.

Documentation Requirements

✓Provider documentation of toxic epidermal necrolysis (TEN)
✓Percentage of body surface area with epidermal detachment (>30% for TEN)
✓Identification of causative medication
✓Documentation of the severity using SCORTEN or similar prognostic tool
✓Treatment setting (ICU, burn unit) and management plan
✓Complications (sepsis, fluid/electrolyte imbalance, respiratory failure, ocular damage)
✓Adverse drug reaction reporting

Commonly Confused Codes

L51.1 (Stevens-Johnson syndrome) — less severe; <10% body surface area detachment L51.3 (SJS-TEN overlap syndrome) — intermediate; 10-30% body surface area detachment T20-T25 (Burns) — thermal burns are coded differently from TEN despite similar wound management L51.0 (Nonbullous erythema multiforme) — much milder condition without significant skin loss

Code Hierarchy

└L51Erythema multiforme └L51.2Toxic epidermal necrolysis [Lyell]

└L51.2Toxic epidermal necrolysis [Lyell]