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Page 6 – CMCS Informational Bulletin these contracted plans and entities often have the most up-to-date beneficiary address information. Section 71103 also requires CMS to establish, by October 1, 2029, a system that CMS and states will use to prevent an individual from being simultaneously enrolled under the state plans (or waivers of such plans) of multiple states. States will be required to submit data to the system at least monthly and during each determination or redetermination of eligibility of an individual for medical assistance under a state plan (or waiver of such plan). Information that states will be required to submit to the system will include an individual’s social security number (if an individual has a social security number and is required to provide such number to enroll under such plan or waiver), and other applicant and beneficiary information that the Secretary determines is necessary to prevent individuals from being inappropriately enrolled in Medicaid or CHIP in multiple states (unless such individual meets such an exception as the Secretary may specify). In addition, section 71103 requires that, at least once each month, the system described above transmits information to the states identifying whether individuals enrolled or seeking to enroll in their respective state are identified as also being enrolled under another state’s state plan (or waiver thereof). Should the system identify such an individual, the state will be required to take appropriate action as determined by the Secretary to determine whether that individual is a resident of the state and, if not, disenroll the individual (unless such individual meets such an exception as the Secretary may specify). This new provision does not eliminate the existing requirement under section 1903(r)(3) of the Act that states must have in operation an eligibility determination system which provides for data matching through the Public Assistance Reporting Information System (PARIS). However, it does provide that, beginning October 1, 2029, the Secretary may determine that a state is not required to have in operation such an eligibility determination system to comply with this requirement. Except as noted above with respect to section 1902(a)(88)(A) of the Act, section 71103 is applicable to all states, the District of Columbia, and the territories. Section 71104. Ensuring Deceased Individuals Do Not Remain Enrolled Section 71104 adds a new paragraph (89) to section 1902(a) of the Act by which a state plan must provide that a state, beginning on January 1, 2027, check the Social Security Administration’s (SSA) Death Master File (DMF) or a successor system on at least a quarterly basis to determine whether Medicaid enrollees are deceased. States will be required to treat such information as factual and, following the provision of notice and fair hearing rights consistent with 42 CFR part 431 subpart E, disenroll such individuals from Medicaid without requesting additional information from the household or authorized representative. If a state determines that the DMF misidentified an individual as deceased, such individual must be immediately reenrolled in Medicaid retroactive to the date of disenrollment. This section also provides that