ICD-10-CM 2027
ICD-10 code for seborrheic dermatitis
From the official ICD-10-CM alphabetic index entry “Dermatitis (eczematous) › seborrheic”. Page updated September 29, 2026.
About coding seborrheic dermatitis
The ICD-10-CM code for seborrheic dermatitis is L21.9 (Seborrheic dermatitis, unspecified). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on L21.9.
Within L21, choose L21.9 (unspecified) only when documentation doesn't support a more specific option: Seborrhea capitis (L21.0), seborrheic infantile dermatitis (L21.1) and other seborrheic dermatitis (L21.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific seborrheic dermatitis codes (official index)
Common questions about seborrheic dermatitis ICD-10 codes
What is the ICD-10 code for seborrheic dermatitis?
- L21.9 — Seborrheic dermatitis, unspecified. More specific codes apply when the documentation supports them: L21.1, L21.8.
What is the ICD-10 code for infantile seborrheic dermatitis?
- L21.1 — Seborrheic infantile dermatitis.
Is L21.9 billable?
- Yes. L21.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L21.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L21.9 as a principal diagnosis.
Is L21.9 a CC or MCC?
- No. L21.9 is neither a CC nor an MCC under MS-DRG v44.0.