ICD-10 Code L40.5 – Arthropathic psoriasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L40.5 – Arthropathic psoriasis
What it is
L40.5 identifies psoriasis with associated joint disease, also called psoriatic arthropathy. Use it when the record shows both psoriatic skin disease and inflammatory joint involvement.
Clinical signs
Common findings include joint pain, swelling, stiffness, and reduced range of motion in a patient with psoriasis. Clinical features vary; refer to documentation for the specific pattern of arthritis or enthesitis.
When to use this code
Use L40.5 when the provider documents psoriatic arthritis, arthropathic psoriasis, or psoriasis with joint involvement. It may also apply when the note clearly links inflammatory arthritis to psoriasis. Check documentation if the joint condition is not explicitly connected.
Do not use for
Do not use this code for psoriasis without joint disease, or for non-psoriatic arthritis. If the record only mentions joint pain or swelling without a documented psoriatic association, check documentation.
Coding tip
Code L40.5 only when the psoriasis-joint relationship is documented, not assumed from symptoms alone.