ICD-10 Code L40.9 – Psoriasis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L40.9 – Psoriasis, unspecified
What it is
L40.9 identifies psoriasis when the record confirms psoriasis but does not specify the type or body site. Use it for a general diagnosis without more detail.
Clinical signs
Psoriasis commonly presents with well-demarcated erythematous plaques and silvery scale. Clinical features vary; refer to documentation if the note does not clearly describe the pattern or subtype.
When to use this code
Use this code when the clinician documents psoriasis and no more specific ICD-10 option is supported by the chart. It also fits cases where the site, subtype, or severity is not stated. If later documentation identifies plaque, guttate, inverse, or another form, code the more specific diagnosis instead.
Do not use for
Do not use L40.9 when the record specifies a different psoriasis type or another papulosquamous disorder. Check documentation if the diagnosis is uncertain or if the note describes only a rash without confirming psoriasis.
Coding tip
Choose the unspecified code only after reviewing the note for a more precise psoriasis diagnosis.