Mental health case managers handle a caseload of clients who have been diagnosed with short- or long-term mental illness or other mental health issues. As a mental health case manager, you are responsible for helping your clients access a variety of recovery services, such as admission to rehabilitation programs, substance abuse treatment and recovery facilities, and other health care services. You are also an advocate for your clients and work with them to develop recovery plans that meet their specific needs and goals, such as harm prevention and employment.