ICD-10-CM > L00-L99 > L20-L30 > L21 L21 Seborrheic dermatitis Non-Billable/Non-Specific Type 2 Excludes infective dermatitis (L30.3)seborrheic keratosis (L82.-) Codes L21.0Seborrhea capitisL21.1Seborrheic infantile dermatitisL21.8Other seborrheic dermatitisL21.9Seborrheic dermatitis, unspecified