Sec. GGG-1. Private nonmedical institution rate standardization. The Department of Health and Human Services shall convene a provider working group to participate in the process of developing and implementing standardized rates for private nonmedical institutions, including substance abuse treatment facilities and community residences for persons with mental illness. The Department of Health and Human Services is authorized to adopt rules to establish a standardized rate structure for private nonmedical institutions that bill MaineCare under the MaineCare Benefits Manual, Chapter III, Section 97, Appendix B: Principles of Reimbursement for Substance Abuse Treatment Facilities, and Appendix E: Principles of Reimbursement for Community Residences for Persons with Mental Illness. The rules must achieve the savings included in Part A and may include a separate standardized rate for each different type and level of service specified. Rules adopted pursuant to this section are routine technical rules as defined in the Maine Revised Statutes, Title 5, chapter 375, subchapter 2-A.