Medical Flexible Benefit Plan. The Medical Flexible Benefit Plan will start September and end in August. Participants will make their elections for the plan year by September 1. Deductions will begin with the September payroll. Reimbursement of eligible medical expense will be available at the start of the plan year and may not exceed the election. Participants have a grace period of thirty (30) days after the end of the plan year to request reimbursement of eligible expenses. Any unused flex dollars will be forfeited to the District after the grace period has lapsed.