2026 ICD-10-CM Diagnosis Code L20Atopic dermatitis

ICD-10-CM Codes›L00–L99›L20-L30›L20

ICD-10-CM L20
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L20 is a non-billable ICD-10-CM category code for atopic dermatitis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as L20.0, L20.81, L20.82, and L20.83.

Code Identity

ICD-10-CM Code
L20
Billable Status
No — Non-Billable Category
Code Describes
Atopic dermatitis
Chapter
L20-L30
Dermatitis and eczema

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL20-L30Dermatitis and eczema
CategoryL20Atopic dermatitis
This CodeL20Atopic dermatitis

Specific Coding for Atopic dermatitisOverview

Non-specific codes like L20 require more characters. Use one of these billable codes instead:

  • Use L20.0 for Besnier's prurigo

  • L20.8 for Other atopic dermatitis

  • Use L20.81 for Atopic neurodermatitis

  • Use L20.82 for Flexural eczema

  • Use L20.83 for Infantile (acute) (chronic) eczema

  • Use L20.84 for Intrinsic (allergic) eczema

  • Use L20.89 for Other atopic dermatitis

  • Use L20.9 for Atopic dermatitis, unspecified

Clinical InformationClinical

  • Atopic Dermatitis

    a common form of eczema that is characterized by chronic skin inflammation, dryness, pruritus, and irritation. it often presents in patients with allergies and may more commonly be noted on the folds of the skin or the scalp.

  • FAF2 wt Allele|ETEA|Expressed In T Cells and Eosinophils In Atopic Dermatitis 2 Gene|Expressed In T-Cells and Eosinophils In Atopic Dermatitis Gene|FAF Family, Member 2 Gene|Fas Associated Factor Family Member 2 wt Allele|Fas-Associated Factor Family, Member 2 Gene|KIAA0887|UBXD8|UBXN3B

    human faf2 wild-type allele is located in the vicinity of 5q35.2 and is approximately 62 kb in length. this allele, which encodes fas-associated factor 2 protein, plays a role in endoplasmic reticulum-associated degradation of misfolded proteins and the regulation of apoptosis. aberrant overexpression of the gene is associated with atopic dermatitis.

  • Immunodeficiency 11B with Atopic Dermatitis|Atopic Dermatitis, Elevated IgE, and Eosinophilia|CARD11/CID|IMD11B

    an autosomal dominant condition caused by mutation(s) in the card11 gene, encoding caspase recruitment domain-containing protein 11. it is characterized by the onset of moderate to severe atopic dermatitis in early childhood, defects in t-cell activation, increased ige, and eosinophilia.

Patient EducationClinical

Eczema

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L20Overview

Is L20 (Atopic dermatitis) a billable code?

No. This is a category header that groups the codes for atopic dermatitis, and headers cannot be submitted on claims. Claims for atopic dermatitis need a more specific code from this category, such as L20.0, L20.81, and L20.82.