ICD-10 Code L51.8 – Other erythema multiforme (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L51.8 – Other erythema multiforme
What it is
L51.8 identifies erythema multiforme that does not fit the more specific categories. It is used when the record supports erythema multiforme, but the documentation does not specify the exact type.
Clinical signs
Clinical features vary; refer to documentation. Erythema multiforme is typically described as an acute, target-like skin eruption, sometimes with mucosal involvement, and may follow an infectious trigger or medication exposure.
When to use this code
Use this code when the clinician documents erythema multiforme and no more specific ICD-10-CM option is stated. It is appropriate for charted cases labeled “other” or when the note does not distinguish the subtype. Check documentation if the record mentions Stevens-Johnson syndrome or another separate diagnosis.
Do not use for
Do not use L51.8 if the provider documents a more specific erythema multiforme code or a different blistering or drug-related rash diagnosis. If the condition is unclear, check documentation before assigning the code.
Coding tip
Code from the provider’s exact wording and confirm whether the note specifies erythema multiforme type or an alternative diagnosis.