ICD-10-CM 2027
ICD-10 code for dermatitis seborrhea
From the official ICD-10-CM alphabetic index entry “Seborrhea, seborrheic › dermatitis”. Page updated September 29, 2026.
About coding dermatitis seborrhea
The ICD-10-CM code for dermatitis seborrhea is L21.9 (Seborrheic dermatitis, unspecified). The official index lists 1 more specific code, 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 dermatitis seborrhea codes (official index)
- infantile L21.1 — Seborrheic infantile dermatitis
Common questions about dermatitis seborrhea ICD-10 codes
What is the ICD-10 code for dermatitis seborrhea?
- L21.9 — Seborrheic dermatitis, unspecified. More specific codes apply when the documentation supports them: L21.1.
What is the ICD-10 code for infantile dermatitis seborrhea?
- 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.