The Increasing Behavioral Health Treatment Act aims to improve access to mental health care for individuals in institutions for mental diseases by changing how Medicaid covers services for these patients. The main objective is to ensure that people receiving treatment in such facilities can also access necessary outpatient care, which is crucial for their recovery and reintegration into the community. One of the key provisions of this legislation is the removal of the existing exclusion in Medicaid that prevents coverage for items and services for patients in institutions for mental diseases.