2024 ICD-10-CM Diagnosis Code L21.8

Other seborrheic dermatitis

ICD-10-CM Code:
L21.8
ICD-10 Code for:
Other seborrheic dermatitis
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Not chronic
Code Navigator:

Code Classification

  • Diseases of the skin and subcutaneous tissue
    (L00–L99)
    • Dermatitis and eczema
      (L20-L30)
      • Seborrheic dermatitis
        (L21)

L21.8 is a billable diagnosis code used to specify a medical diagnosis of other seborrheic dermatitis. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Acute generalized seborrheic dermatitis
  • Acute seborrheic dermatitis
  • Diffuse dermatitis
  • Erythematosquamous dermatosis
  • Erythrodermic seborrheic dermatitis
  • Flexural seborrheic dermatitis
  • Greasy skin
  • Neonatal sebaceous gland hyperplasia
  • Parakeratosis
  • Physiological anomaly of neonatal skin
  • Pityriasiform seborrheic dermatitis
  • Post-encephalitic seborrhea
  • Sebaceous hyperplasia
  • Sebaceous hyperplasia
  • Sebaceous hyperplasia
  • Seborrhea adiposa
  • Seborrhea corporis
  • Seborrhea faciei
  • Seborrhea nasi
  • Senile sebaceous gland hyperplasia

Clinical Classification

Clinical Information

  • Parakeratosis

    persistence of the nuclei of the keratinocytes into the stratum corneum of the skin. this is a normal state only in the epithelium of true mucous membranes in the mouth and vagina. (dorland, 27th ed)
  • Parapsoriasis

    the term applied to a group of relatively uncommon inflammatory, maculopapular, scaly eruptions of unknown etiology and resistant to conventional treatment. eruptions are both psoriatic and lichenoid in appearance, but the diseases are distinct from psoriasis, lichen planus, or other recognized dermatoses. proposed nomenclature divides parapsoriasis into two distinct subgroups, pityriasis lichenoides and parapsoriasis en plaques (small- and large-plaque parapsoriasis).
  • Pityriasis Lichenoides

    a subgroup of parapsoriasis itself divided into acute and chronic forms. the acute form is characterized by the abrupt onset of a generalized, reddish-brown, maculopapular eruption. lesions may be vesicular, hemorrhagic, crusted, or necrotic. histologically the disease is characterized by epidermal necrolysis. the chronic form shows milder skin changes with necrosis.
  • Hyperparakeratosis

    a morphologic finding indicating increased keratin formation, preservation of the nuclei in the superficial cells, and absence of the stratum granulosum in a skin or squamous mucosa sample.
  • Parakeratosis

    abnormal retention of nuclei, and the resulting incomplete keratinization, of epithelial cells in the stratum corneum layer of the skin.
  • Tobacco Induced Hyperparakeratosis

    hyperparakeratosis of the oral mucosa caused by chronic tobacco use. it manifests as oral leukoplakia.
  • Sebaceous Hyperplasia

    enlargement of the sebaceous glands.
  • Senile Sebaceous Hyperplasia

    a hyperplasia of the sebaceous glands. it is usually seen as small yellow papules in the face of middle aged-older population.
  • Erythematosquamous Dermatosis

    a skin condition that primarily affects the scalp and face and presents as scaly inflammation. examples include itchy, dry skin and dandruff.

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert L21.8 to ICD-9-CM

  • ICD-9-CM Code: 690.18 - Sebrrheic dermatitis NEC

Patient Education


Dandruff, Cradle Cap, and Other Scalp Conditions

Your scalp is the skin on the top of your head. Unless you have hair loss, hair grows on your scalp. Different skin problems can affect your scalp.

Dandruff is a flaking of the skin. The flakes are yellow or white. Dandruff may make your scalp feel itchy. It usually starts after puberty, and is more common in men. Dandruff is usually a symptom of seborrheic dermatitis, or seborrhea. It is a skin condition that can also cause redness and irritation of the skin.

Most of the time, using a dandruff shampoo can help control your dandruff. If that does not work, contact your health care provider.

There is a type of seborrheic dermatitis that babies can get. It is called cradle cap. It usually lasts a few months, and then goes away on its own. Besides the scalp, it can sometimes affect other parts of the body, such as the eyelids, armpits, groin, and ears. Normally, washing your baby's hair every day with a mild shampoo and gently rubbing their scalp with your fingers or a soft brush can help. For severe cases, your health care provider may give you a prescription shampoo or cream to use.

Other problems that can affect the scalp include:

  • Scalp ringworm, a fungal infection that causes itchy, red patches on your head. It can also leave bald spots. It usually affects children.
  • Scalp psoriasis, which causes itchy or sore patches of thick, red skin with silvery scales. About half of the people with psoriasis have it on their scalp.

[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.