ICD-10 Code L40.59 – Other psoriatic arthropathy (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L40.59 – Other psoriatic arthropathy
What it is
L40.59 identifies psoriatic arthritis or related psoriatic joint disease that does not fit a more specific ICD-10 option. Use it when documentation confirms psoriatic arthropathy but gives no clearer subtype.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include inflammatory joint pain, swelling, stiffness, and psoriasis-related skin or nail changes, but the record should support the psoriatic arthropathy diagnosis.
When to use this code
Use this code when the clinician documents psoriatic arthropathy, psoriatic arthritis, or similar language and does not specify another psoriatic joint category. It is appropriate for encounters focused on the joint disease even if skin findings are also present. Check documentation if the note suggests another inflammatory arthritis diagnosis.
Do not use for
Do not use this code for psoriasis without joint involvement or for a different inflammatory arthropathy. If the record names a more specific psoriatic arthritis type, code that instead.
Coding tip
Look for explicit provider wording linking the joint disorder to psoriasis before assigning L40.59.