(1) When a vocational rehabilitation provider receives a payment to which that provider is not entitled, the provider must repay the excess amount, plus accrued interest, without regard to whether the excess payment occurred due to provider or department error or oversight.

(2) Interest accrues on excess payments at the rate of one percent per month or portion of a month beginning on the thirty-first day after payment was made. Where partial repayment on an excess payment is made, interest accrues on the remaining balance.

(3) The department reserves the option of either requesting the provider to remit the amount of excess payment and accrued interest to the department or offsetting excess payments and accrued interest against future payments due the provider.