ICD-10 Code L20.84 – Intrinsic (allergic) eczema (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L20.84 – Intrinsic (allergic) eczema
What it is
L20.84 identifies intrinsic, or allergic, eczema: a chronic inflammatory skin condition with recurrent flares. Use it when the documentation specifies this subtype rather than a broader eczema diagnosis.
Clinical signs
Typical findings include itchy, inflamed, dry, or scaly skin, often with periods of worsening and improvement. Clinical features vary; refer to documentation for the exact subtype and any noted distribution.
When to use this code
Use L20.84 when the provider documents intrinsic eczema, allergic eczema, or an equivalent term. It is appropriate when the record clearly distinguishes this condition from other eczema types or from unspecified dermatitis. Check documentation if the note only says “eczema” without further detail.
Do not use for
Do not use this code for unspecified eczema, atopic dermatitis, or contact dermatitis unless the documentation specifically supports intrinsic eczema. If the diagnosis is unclear, code the documented condition instead.
Coding tip
Look for the exact subtype wording in the assessment, because “eczema” alone is not enough to assign L20.84.