Creates the Mental Health and Substance Use Disorder Professional Support Grant Program Act. Creates within the Department of Human Services a Mental Health and Substance Use Disorder Professional Support Grant Program to provide grants to mental health facilities and substance use disorder treatment programs. Creates the Mental Health and Substance Use Disorder Professional Support Grant Fund as a special fund in the State treasury. Provides that money in the Fund shall be used by the Secretary of the Department to make grants to eligible mental health facilities and substance use disorder treatment programs. Requires grant recipients to use grant funds for expenses related to recruiting, retaining, and compensating licensed mental health or substance use disorder professionals. Provides that each grant recipient shall receive up to $200,000 in grant funding for each mental health or substance use disorder professional employed, engaged, or contracted by the recipient. Contains provisions concerning application requirements and Department rulemaking authority. Amends the Substance Use Disorder Act. Provides that the amendatory provisions may be referred to as the Equity in Accessibility Law. Requires the Department to provide funding and reimbursement for those costs associated with the provision of American Sign Language services and interpretive services for non-English speaking patients at substance use disorder treatment programs and facilities. Provides that funding and reimbursement shall be based upon the actual cost incurred by the substance use disorder treatment program or facility and shall reflect regional differences in costs and expenses related to the provision of American Sign Language and interpretive services at each location. Contains provisions on applications requirements and Department rulemaking authority. Effective immediately.