ICD-10 L51
Non-Billable HeaderErythema multiforme
About ICD-10-CM L51
ICD-10-CM code L51 represents Erythema multiforme. This is a non-billable header code in the Skin and Subcutaneous Tissue chapter (block L51). The 2026 edition of ICD-10-CM L51 became effective on October 1, 2025. Non-billable codes cannot be used as a primary or secondary diagnosis on a claim, use a more specific child code instead.
Type 1 Excludes
Pure excludes, these codes can never be coded together with L51. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- staphylococcal scalded skin syndrome (L00)
- Ritter's disease (L00)
Use Additional Code
When coding L51, also report these additional codes when applicable.
- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
Medicare LCD Coverage for L51
Local Coverage Determinations (LCDs) from CMS MACs that list L51 as a covered diagnosis.
This doesn't mean the code isn't covered, it means no MAC has issued a Local Coverage Determination naming this specific code. Coverage may still apply under National Coverage Determinations or general medical-necessity rules.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing L51.
Our payer policy database covers Aetna, Cigna, Anthem, BCBS, Humana, and Medicare Advantage plans, but L51 doesn't currently appear in any indexed policy. The code may still be covered under standard plan benefits.
CPT Codes Commonly Billed with L51
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Codes Adjacent To L51
Other codes in section L49-L54 (Urticaria and erythema).
ICD-10 L51, Billing FAQ
Is ICD-10 code L51 billable? +
No, L51 is a non-billable header code. Use a more specific child code from block L51 when submitting claims.
What codes are Type 1 Excludes for L51? +
Type 1 Excludes (never code together with L51): staphylococcal scalded skin syndrome (L00); Ritter's disease (L00)
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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