Prepare Written Notices & Determination Letters: Draft, finalize, and issue timely written notification letters for prospective participants who do not meet clinical, geographic, or financial eligibility criteria (denial of enrollment), as well as required notices for participants facing involuntary disenrollment (e.g., loss of MassHealth eligibility, relocation outside service area, failure to pay cost share, disruptive behavior/safety reasons) in accordance with CMS regulations, MassHealth rules, and organizational policies, ensuring proper inclusion of grievance and appeal/fair hearing rights. The Specialist is an integral member of the Intake & Enrollment team, collaborating closely with the Interdisciplinary Team (IDT), the Insurance/Billing Department, CMS, MassHealth, and external partner agencies to ensure all eligibility, payer source, and regulatory requirements are fulfilled accurately and on schedule.