A consensus definition has been established for complex-to-manage and treatment-refractory psoriatic arthritis as part of a GRAPPA initiative. This development may help refine the understanding and treatment of difficult-to-treat cases, although the relationship between diagnostic delay and treatment outcomes is still being studied. The broader concept of difficult-to-treat disease in rheumatology is also being explored, with potential implications for various conditions, including rheumatoid arthritis and ankylosing spondylitis.