Most Medicare beneficiaries are enrolled in Medicare Advantage (MA) plans, but MA claims are not used in Medicare rate-setting. It is imperative for stakeholders to have access to MA data along with Medicare fee-for-service (FFS) data to improve the rate-setting process. Nimitt created this article to help providers advocate for access to MA claims data and encourage CMS to study the impact of MA claims’ exclusion on FFS rate-setting.