L21 vs L71.0
L21 (Seborrheic dermatitis) compared with L71.0 (Perioral dermatitis), 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 L71.0: “perioral dermatitis (L71.0)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| L21Seborrheic dermatitis | L71.0Perioral dermatitis | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) | L00-L99 — Diseases of the Skin and Subcutaneous Tissue (L00-L99) |
| Definition | Seborrheic dermatitis is a non-billable ICD-10-CM category code (L21). | Perioral dermatitis is a billable ICD-10-CM diagnosis code (L71.0). |
| Use additional code | — | code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources