If Palmetto GBA is your HHH MAC, don't be surprised when no payments or remittance advices are issued Tues. May 17 and Wed. May 18. Those are "dim days" required to implement Palmetto's next transition phase to the Jurisdiction 11 MAC contract, the MAC says on its website. Don't worry: To avoid cash flow problems, your May 17 and 18 payments should have been made on May 13 instead, Palmetto notes.