The charity ADHD UK has sent a legal letter to the West Yorkshire NHS integrated care board, seen by the Guardian, stating that the board's decision to force patients to wait at least two years for assessments is unlawful and that the charity will seek a judicial review if the policy is not reversed.
West Yorkshire is one of four integrated care boards (ICBs) in England that have introduced such minimum waiting times, patient groups say. The boards cite surging demand for ADHD and autism assessments and the cost of providing them as reasons for the policy. Critics describe the delays as "scandalous" and warn they leave people without the support they need for years.
The legal challenge puts pressure on the NHS to address waiting times for neurodevelopmental assessments, which have grown significantly in recent years. The charity alleges the approach violates patients' rights and fails to meet legal standards for timely care.
The West Yorkshire ICB has not publicly responded to the legal threat. The other ICBs imposing similar waits have not yet faced formal legal action.
The Guardian reported the developments exclusively.