I don't like the term case management. It implies that the patient/client is a "case" to be worked on. They are however in practice remarkable programs.

In the outpatient setting it refers to something similar to a "social worker" who can help you in more aspects of your life than just your Mental Health. They may manage your finances, real estate etc., They can arrange housing, jobs and use the "system" to your benefit.

In an inpatient setting a case manager may facilitate your transition back into the community. They may be part of a team that makes sure you follow-up with your pdoc visits, are compliant with your medications and have a safe living condition.