This guide describes the interface that states with Financial Alignment Initiative Demonstrations use to conduct Medicare eligibility verification and MMP enrollment submission to the CMS MARx systems. The MMP technical guide has been updated in version 5 to enhance the Medicare Eligibility data response. Several new data components will be included in the Medicare eligibility response in all eligibility mediums, including UI eligibility screens, batch and webservice responses. These changes will be implemented on Thursday, March 10, 2022.