ICD-10 Code L40.4 – Guttate psoriasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L40.4 – Guttate psoriasis
What it is
L40.4 identifies guttate psoriasis, a form of psoriasis that usually appears as many small, drop-shaped lesions. It is a distinct clinical subtype and should be coded when documentation specifies this pattern.
Clinical signs
Typical findings include numerous small, scattered papules or plaques with scale, often on the trunk and proximal limbs. Clinical features vary; refer to documentation for the exact diagnosis and lesion description.
When to use this code
Use L40.4 when the provider documents guttate psoriasis, including new-onset or flare presentations described with that term. It is also appropriate when the note clearly identifies a guttate pattern rather than another psoriasis subtype. Check documentation if the morphology is unclear.
Do not use for
Do not use this code for other psoriasis forms, such as plaque, pustular, inverse, or erythrodermic psoriasis, unless guttate psoriasis is specifically documented. If the record only says “psoriasis,” check documentation.
Coding tip
Code the most specific psoriasis subtype stated by the clinician, and do not infer guttate psoriasis from rash appearance alone.