An eligible client for intensive residential treatment services is an individual who: * Is age 18 or older * Is diagnosed with a mental illness * Because of a mental illness, has substantial disability and functional impairment * Has one or more of the following: a history of two or more inpatient hospitalizations in the past year, significant independent living instability, homelessness, or very frequent use of mental health and related services yielding poor outcomes * Needs mental health services that cannot be met with other available community-based services, or is likely to experience a mental health crisis or require a more restrictive setting if intensive rehabilitative mental health services are not provided