L21
⚠ Non-billable
Seborrheic dermatitis
ICD-10-CM · FY2026 · Diseases of the Skin and Subcutaneous Tissue
Code
L21
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Skin and Subcutaneous Tissue
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Excludes2 — not included here, but may code together
- infective dermatitis (L30.3)
- seborrheic keratosis (L82.-)
Frequently asked questions
What is ICD-10 code L21?
ICD-10-CM code L21 represents Seborrheic dermatitis. It is a non-billable header code requiring a more specific subcategory in the Diseases of the Skin and Subcutaneous Tissue chapter, effective October 1, 2025 – September 30, 2026.
Is L21 billable?
No. L21 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is L21 in?
L21 belongs to the Diseases of the Skin and Subcutaneous Tissue chapter (L00–L99) of ICD-10-CM.
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