An individual is eligible to participate in the REM program if the individual: Is eligible for Maryland Medicaid Managed Care as specified in COMAR 10.67.02.01; Has one or more of the diagnoses specified in Regulation .17 of this chapter; and Elects to participate in the REM program. The Department shall render a determination of an individual's eligibility within 5 business days on receipt of: A completed REM application; Any requested documentation verifying an individual meets the criteria set forth in §A of this regulation; and Verbal or written confirmation an individual elects to participate.