Overpayment Unit (OPU)
The contact information for the Overpayment (OPU) unit is as follows:
●121C
PO Box 19009
Mail Drop 33S4
Phoenix AZ 85005-9009
Phone: (602) 774-9277 or toll free at (833) 470-0432
Fax: (602) 774-9262 or toll free at (833) 709-0827