ICD-10 Code L41.4 – Large plaque parapsoriasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L41.4 – Large plaque parapsoriasis
What it is
Large plaque parapsoriasis is a chronic skin disorder marked by persistent, scaly patches or plaques. It is usually considered a cutaneous lymphoproliferative condition and may require ongoing dermatologic follow-up.
Clinical signs
Typical findings include well-defined, larger plaques on the trunk or limbs, often with fine scale and variable color change. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents large plaque parapsoriasis specifically. It also fits follow-up visits for a confirmed diagnosis, even if the note focuses on surveillance or skin examination. Do not code it from nonspecific rash language alone.
Do not use for
Do not use this code for small plaque parapsoriasis or for undiagnosed dermatitis, psoriasis, or eczema. Check documentation if the lesion type is not clearly stated.
Coding tip
Code only when the record clearly identifies large plaque parapsoriasis by name or equivalent wording.