Psoriatic arthritis mutilans

This code represents a severe and destructive form of psoriatic arthritis characterized by osteolysis, leading to telescoping digits (arthritis mutilans). It involves significant bone resorption and joint deformity, primarily affecting the hands and feet.

Apply this code when documentation explicitly states "psoriatic arthritis mutilans" or describes the characteristic features of severe joint destruction, bone resorption, and telescoping digits in a patient with psoriasis. Confirmation by a rheumatologist is often present in the medical record.

• Ensure the documentation clearly specifies "mutilans" to differentiate from other forms of psoriatic arthritis.
• Always code the underlying psoriasis (L40.0-L40.9) first, followed by this code, to fully capture the patient's condition.
• Do not confuse with other erosive arthropathies; the presence of psoriasis is key for this diagnosis.