L21 ICD-10-CM Code: Seborrheic dermatitis
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Official description
L21Seborrheic dermatitis
ICD-10-CM diagnosis code · United States clinical modification
Where L21 sits
- 1
Chapter 12
Diseases of the skin and subcutaneous tissue (L00-L99)
- 2
Section
Dermatitis and eczema (L20-L30)
- 3
Category L21
Seborrheic dermatitis
- 4
Code L21
Seborrheic dermatitis
Codes under L21
L21 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Notes for this code
Inclusion terms
No inclusion terms are listed for L21.
Code first
No “code first” instruction is listed for L21.
Use additional code
No “use additional code” instruction is listed for L21.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for L21.
Excludes2
Conditions not included here that may be reported separately when present.
- infective dermatitis (L30.3)
- seborrheic keratosis (L82.-)
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code L21 mean?
L21 is the FY 2027 U.S. ICD-10-CM code for “Seborrheic dermatitis.”
Is L21 a billable or specific ICD-10-CM code?
No. L21 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is L21 located in ICD-10-CM?
L21 is listed in Chapter 12, Diseases of the skin and subcutaneous tissue (L00-L99), within Dermatitis and eczema (L20-L30) (L20–L30), under category L21, Seborrheic dermatitis.
What coding notes are listed for L21?
No inclusion terms are listed for L21 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: infective dermatitis (L30.3); seborrheic keratosis (L82.-).