The "Medicaid Program Improvement Act" aims to enhance the accuracy of enrollee address information within the Medicaid program. It amends the Social Security Act to require states, beginning January 1, 2026, to implement a process for regularly obtaining and acting upon reliable address data for individuals enrolled in Medicaid. This process mandates the use of specific reliable data sources , as outlined in federal regulations, to ensure that enrollee addresses are current and accurate. Furthermore, the bill extends this requirement to the Children's Health Insurance Program (CHIP) and obligates Medicaid managed care organizations to transmit any directly obtained or verified enrollee address information to the respective states, also effective January 1, 2026.