ICD-10 Diagnosis Code L21.9

Seborrheic dermatitis, unspecified

Diagnosis Code L21.9

ICD-10: L21.9
Short Description: Seborrheic dermatitis, unspecified
Long Description: Seborrheic dermatitis, unspecified
This is the 2017 version of the ICD-10-CM diagnosis code L21.9

Code Classification
  • Diseases of the skin and subcutaneous tissue
    • Dermatitis and eczema (L20-L30)
      • Seborrheic dermatitis (L21)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code L21.9 is grouped in the following Diagnostic Related Group(s) (MS-DRG v33.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Acute seborrheic dermatitis
  • Chronic seborrheic dermatitis
  • Facial seborrheic dermatitis
  • Perianal dermatitis
  • Perianal seborrheic dermatitis
  • Seborrhea
  • Seborrheic blepharitis
  • Seborrheic dermatitis
  • Seborrheic eczema-like eruption
  • Seborrhoeide
  • Truncal seborrheic dermatitis

Index of Diseases and Injuries
References found for the code L21.9 in the Index of Diseases and Injuries:

Information for Patients


Also called: Dermatitis

Eczema is a term for several different types of skin swelling. Eczema is also called dermatitis. Most types cause dry, itchy skin and rashes on the face, inside the elbows and behind the knees, and on the hands and feet. Scratching the skin can cause it to turn red, and to swell and itch even more.

Eczema is not contagious. The cause is not known. It is likely caused by both genetic and environmental factors. Eczema may get better or worse over time, but it is often a long-lasting disease. People who have it may also develop hay fever and asthma.

The most common type of eczema is atopic dermatitis. It is most common in babies and children but adults can have it too. As children who have atopic dermatitis grow older, this problem may get better or go away. But sometimes the skin may stay dry and get irritated easily.

Treatments may include medicines, skin creams, light therapy, and good skin care. You can prevent some types of eczema by avoiding

  • Things that irritate your skin, such as certain soaps, fabrics, and lotions
  • Stress
  • Things you are allergic to, such as food, pollen, and animals

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases

  • Atopic dermatitis -- self-care
  • Atopic eczema
  • Dyshidrotic eczema
  • Nummular eczema
  • Seborrheic dermatitis

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