3. If you get a Part D-covered insulin product and pay more than $35 for any month’s supply between January 1, 2023 and March 31, 2023, your Part D plan must reimburse you within 30 calendar days for the amount you paid that’s over $35 per month’s supply. (Part D plans have until March 31, 2023, to update their systems to make sure you’re charged the correct amount.) If you haven’t received reimbursement within 30 days, contact your plan.