This report, written by Robert Seifert and Rachel Gershon of the Center for Health Law and Economics at UMass Medical School, examines the key components of the most recent Massachusetts health reform law - Chapter 224 of the Acts of 2012 - as they pertain to the Massachusetts Medicaid program (“MassHealth”). Under the new law, MassHealth will be subject to the annual spending growth benchmark and will be required to implement alternative payment arrangements for most of its members, among other new requirements and responsibilities. For a broader overview of Chapter 224 of the Acts of 2012, see the Foundation’s report: Summary of Chapter 224 of the Acts of 2012. For additional information about scheduled stakeholder meetings, grant opportunities, and other implementation updates, see the state's website, Implementing Health Care Cost Containment.