The Accelerating the Development of Advanced Psychology Trainees Act, or ADAPT Act, seeks to significantly expand access to crucial psychological mental and behavioral health services. Its primary goal is to make these services more readily available to beneficiaries of Medicare , Medicaid , and the Children's Health Insurance Program (CHIP) . A key provision of the bill allows for Medicare reimbursement of services furnished by advanced psychology trainees, including doctoral interns and postdoctoral residents, when under the general supervision of a clinical psychologist. These services must be billed by the supervising psychologist, and the Secretary of Health and Human Services is mandated to develop a specific "GC" modifier code for accurate billing. Furthermore, the bill directs the Secretary to issue guidance to states on overcoming barriers to covering these services under Medicaid and CHIP, offering recommendations on legal mechanisms, billing codes, and examples of successful state waivers.