Follow the steps below to reactivate a Payer.
Select Customer Setup > Payers.
Place a check in the Include inactive payers box.
Use the Show All button to view all payers. Or use the Search field to further drill down your search.
Select the Payer to reactivate.
Click OK when the “This payer is currently inactive.” pop-up displays.
Uncheck the Make this payer inactive checkbox.