ICD-10-CM 2027
ICD-10 code for Leiner's disease
From the official ICD-10-CM alphabetic index entry “Leiner's disease”. Page updated September 29, 2026.
About coding Leiner's disease
The ICD-10-CM code for Leiner's disease is L21.1 (Seborrheic infantile dermatitis).
Within L21 (seborrheic dermatitis), L21.1 is specifically for seborrheic infantile dermatitis. Related codes cover Seborrhea capitis (L21.0), other seborrheic dermatitis (L21.8) and unspecified (L21.9).
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.
Common questions about Leiner's disease ICD-10 codes
What is the ICD-10 code for Leiner's disease?
- L21.1 — Seborrheic infantile dermatitis.
Is L21.1 billable?
- Yes. L21.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L21.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L21.1 as a principal diagnosis.
Is L21.1 a CC or MCC?
- No. L21.1 is neither a CC nor an MCC under MS-DRG v44.0.