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    v1.0.28
    OpenPayerBilling CodesDermatitis and eczemaICD-10-CM l20-atopic-dermatitis
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    ICD-10-CM Code For Atopic Dermatitis: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group L20 includes atopic dermatitis and related atopic eczema conditions, covering localized and generalized presentations, acute and chronic forms, and variant descriptors such as infantile or flexural involvement. These ICD-10-CM diagnosis codes are used to document patient encounters for pruritic, inflammatory skin conditions, capturing disease severity, extent of skin involvement, and presence of complications such as lichenification or infection. Accurate coding within the ICD-10-CM L20 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM L20: Atopic Dermatitis Overview

    The diagnoses in the ICD-10-CM L20 group represent atopic dermatitis and related atopic eczema conditions affecting the skin. These disorders target the integumentary system and commonly involve pruritic, inflammatory skin lesions that may be acute or chronic. Accurate coding matters for appropriate clinical documentation and can affect reimbursement by reflecting disease severity and complexity.

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    When to Use

    Use a code from this group when documenting a clinical encounter for atopic dermatitis or atopic eczema to reflect the specific type, distribution, and any complications present. Select the most specific code available to capture severity, chronicity, and associated findings such as lichenification or secondary infection.

    ICD-10-CM Codes

    7 rows

    ICD-10-CM CodeDescription
    L20.0Besnier's prurigo
    L20.81Atopic neurodermatitis
    L20.82Flexural eczema
    L20.83Infantile (acute) (chronic) eczema
    L20.84Intrinsic (allergic) eczema
    L20.89Other atopic dermatitis
    L20.9Atopic dermatitis, unspecified

    DRG Codes

    2 rows

    DRG CodeDescription
    606Minor Skin Disorders with MCC
    607Minor Skin Disorders without MCC

    Typical Clinical Scenarios

    • A 6-month-old infant presents to the pediatric clinic with intensely pruritic, erythematous, weeping patches in the creases of the elbows and behind the knees, parents report chronic flares since 3 months of age and frequent sleep disturbance. The clinician documents a long-standing atopic dermatitis with widespread eczematous involvement requiring ongoing topical therapy and skin-care counseling, so a code reflecting generalized or unspecified atopic eczema is assigned. Typical codes: L20.9, L20.81
    • A 28-year-old adult arrives at urgent care with an acute, sharply demarcated flare of itchy, erythematous plaques on the neck and antecubital fossae after a new cosmetic product; lesions are oozing and there is secondary bacterial crusting. Treatment focuses on controlling the acute exacerbation and addressing possible secondary infection; an atopic dermatitis code specifying acute exacerbation or infected/complicated eczema is used. Typical codes: L20.0, L20.82
    • A 45-year-old patient with a long history of atopic dermatitis is seen in dermatology for persistent lichenified, hyperpigmented patches due to chronic scratching and postinflammatory changes, reporting reduced quality of life and sleep disruption. The visit documents chronic, pruritic hand and body involvement with lichenification and treatment-resistant disease warranting ongoing specialized management; a chronic or nonacute atopic dermatitis code is assigned. Typical codes: L20.84, L20.89

    Related Codes

    L21-SEBORRHEIC-DERMATITIS

    ICD-10-CM Code For Seborrheic Dermatitis: Group Overview

    L22-DIAPER-DERMATITIS

    ICD-10-CM Code For Diaper Dermatitis: Group Overview

    L23-ALLERGIC-CONTACT-DERMATITIS

    ICD-10-CM Code For Allergic Contact Dermatitis: Group Overview

    L24-IRRITANT-CONTACT-DERMATITIS

    ICD-10-CM Code For Irritant Contact Dermatitis: Group Overview

    L25-UNSPECIFIED-CONTACT-DERMATITIS

    ICD-10-CM Code For Unspecified Contact Dermatitis: Group Overview

    L26-EXFOLIATIVE-DERMATITIS

    ICD-10-CM Code For Exfoliative Dermatitis: Group Overview

    L27-DERMATITIS-DUE-TO-SUBSTANCES-TAKEN-INTERNALLY

    ICD-10-CM Code For Dermatitis Due To Substances Taken Internally: Group Overview

    L28-LICHEN-SIMPLEX-CHRONICUS-AND-PRURIGO

    ICD-10-CM Code For Lichen Simplex Chronicus And Prurigo: Group Overview

    L29-PRURITUS

    ICD-10-CM Code For Pruritus: Group Overview

    L30-OTHER-AND-UNSPECIFIED-DERMATITIS

    ICD-10-CM Code For Other And Unspecified Dermatitis: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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