Establish New Payment Methodology/ACHs: Directs the Department of Health and Human Services (DHHS) to establish and convene a workgroup to evaluate reimbursement options under managed care for adult care homes that takes into account all funding streams and to develop a service definition or definitions under managed care to accomplish the General Assembly’s intent to provide stable and reliable funding to adult care homes in order to ensure access, choice and quality of care. Requires the participation of representatives of the adult care home industry and other relevant stakeholders in the workgroup. Mandates the inclusion of the following components in the development of the service definition: (1) support for alternative payment models, including pay-for-performance initiatives, available under the State’s 1115 Medicaid waiver and Medicaid transformation; (2) best practices for long-term services and supports; and (3) efficient payment methodologies.