A system and method for rules-driven adjudication is disclosed. The system includes a storage includes a rule library having a plurality of rules, each rule being in a human-readable format and including a first data tag, a comparator, a comparison value, and a result. The system also includes a rules manager configured to receive and store a new rule. The system includes a rules evaluator configured to receive an adjudication request having a data object associated with a data tag, and evaluate the request and create a primary determination by applying a first rule to the request, and further applying a first subsequent rule and all logically adjacent rules until all logically adjacent rules have been exhausted and the primary determination is an indefinite outcome or the applying of a final rule returns an outcome that becomes the primary determination.