ICD-10 Code L40.52 – Psoriatic arthritis mutilans (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L40.52 – Psoriatic arthritis mutilans
What it is
L40.52 identifies psoriatic arthritis mutilans, the most destructive form of psoriatic arthritis. It is used when psoriasis-related joint disease causes severe bone and joint damage with deforming changes.
Clinical signs
Clinical features vary; refer to documentation. Typical findings include marked joint destruction, telescoping digits, deformity, and severe erosive changes associated with psoriatic disease.
When to use this code
Use this code when the provider documents psoriatic arthritis mutilans, or clearly describes mutilating, destructive psoriatic arthropathy. It may appear in rheumatology, orthopedics, or problem lists when the diagnosis is established. Check the record for explicit linkage to psoriasis.
Do not use for
Do not use it for ordinary psoriatic arthritis without mutilating changes. Also avoid it when the chart only says arthritis, deformity, or psoriasis without a documented psoriatic arthritis mutilans diagnosis.
Coding tip
Code only when the provider documents the mutilans subtype; otherwise, query or check documentation for the most specific psoriatic arthritis code.