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Compare/L21 vs L55

L21 vs L55

L21 (Seborrheic dermatitis) compared with L55 (Sunburn), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. L21 carries an Excludes2 note covering L55: “radiation-related disorders of the skin and subcutaneous tissue (L55-L59)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

L21Seborrheic dermatitisL55Sunburn
Billing statusNon-billable header

Report instead: L21.0, L21.1, L21.8, L21.9

Non-billable header

Report instead: L55.0, L55.1, L55.2, L55.9

ClassificationL00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99)
DefinitionSeborrheic dermatitis is a non-billable ICD-10-CM category code (L21).Sunburn is a non-billable ICD-10-CM category code (L55).
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources