L21.9Billable

Seborrheic dermatitis, unspecified

Chapter
12. Diseases of the skin and subcutaneous tissue
Category
L21
Effective date
October 1, 2026

Related codes in category L21

L21Seborrheic dermatitisL21.0Seborrhea capitisYesL21.1Seborrheic infantile dermatitisYesL21.8Other seborrheic dermatitisYes

Frequently asked questions

What is ICD-10 code L21.9?

L21.9 is an ICD-10-CM diagnosis code for Seborrheic dermatitis, unspecified.

Is L21.9 a billable code?

Yes. L21.9 is billable and specific enough to be used on a claim.

What ICD-10-CM chapter is L21.9 in?

L21.9 falls under Chapter 12: Diseases of the skin and subcutaneous tissue.

When did L21.9 become effective?

L21.9 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to L21.9?

L21.9 belongs to category L21, which includes 4 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.