Systems and methods are provided for generating an individual's longitudinal medication history. Consent to generate an individual's longitudinal medication history across a pharmacy(s) and a claims processor(s) is received. A first collection of medication history data corresponding to the individual is selectively identified from medication history data files associated with the claims processor(s) and a first plurality of individuals. The selective identification is based on a claims processor patient identifier(s) associated with the individual and the claims processor(s). A second collection of medication history data corresponding to the individual is selectively identified from medication history data files associated with the pharmacy(s) and a second plurality of individuals. The selective identification is based on a linking index(s) associated with the claims processor patient identifier(s). An individual's longitudinal medication history is generated, based on the first collection of medication history data and the second collection of medication history data.