Today, the Centers for Medicare and Medicaid Services (CMS) released an informational bulletin to remind states of their obligation to act timely on changes in circumstances with respect to residency and provides guidance on steps needed to identify and redetermine eligibility for concurrently enrolled beneficiaries. CMS will soon provide each state with a one-time file on Medicaid and Children’s Health Insurance Program (CHIP) beneficiaries identified as potentially also enrolled in another state, based on state-provided data from T-MSIS. States should review the information provided and, as appropriate, promptly redetermine eligibility for the identified beneficiaries and take necessary action to terminate coverage for those whom the state determines are no longer eligible based on residency.