In this reflection we summarise the various obstacles to accessing healthcare encountered by people with neurodevelopmental disorders (intellectual disability, autism and attention-deficit hyperactivity disorder) with and without mental health problems. We outline different service models from around the world, ranging from the person centred to the institutional. Finally, we suggest ways of addressing some of the problems identified, including a model of integrated care involving intellectual disability, neurodevelopmental and mental health services that would better serve this population.