This document is about a compendium of guidance provided by the U.S. Department of Labor, Department of Health and Human Services, and Department of the Treasury on categories of violations identified under the Mental Health Parity and Addiction Equity Act (MHPAEA) and the corresponding rules and guidance issued by the Departments to address those violations. It includes references to the MHPAEA Final and Interim Final Rules, as well as various FAQs, compliance tools, and other guidance documents related to MHPAEA compliance.