Abstract: A method, apparatus and computer program product are provided for providing rebate claim validation. A drug manufacturer or associated computer may receive rebate claims from pharmacy benefit managers (PBMs). The manufacturer should not be obligated to pay the rebate if the associated prescription drug was initially sold by the manufacturer under a discount program such as 340B. However, manufacturers may not be able to discern which rebate claims are associated with a discount program. A service provider utilizes adjudicated prescription claims from a contract pharmacy, and encounter data from a covered entity to validate the rebate claims and indicate to the manufacturer whether a rebate claim is associated with a discount program such as 340B.