Abstract: Methods, non-transitory machine readable media, and bill review engine devices that provide customized rule engines for automated medical bill review are disclosed. With this technology, a selection of a reusable logical pattern from a pattern library is received. The reusable logical pattern comprises source code defining at least one action and one or more template fields. The template fields are populated based on received rule parameter data to generate and store a rule. The rule parameter data comprises one or more triggering codes. The rule is then applied to contents of a received electronic medical bill to determine when the rule is triggered based on the triggering codes. A pricing result for the electronic medical bill, determined based on the action, is subsequently returned to a source of the electronic medical bill, when the determination indicates that the rule is triggered.