ABSTRACT: The Version 53 Summary provides a synopsis, by topic, of the changes that will be contained as part of Transmittal 86 of the CABS Billing Output Specifications. The Version Summary explains, on an item-by-item approach, the changes being made for a particular version. This item-by-item approach avoids a review of the entire CABS BOS to determine what changes are being incorporated. It is a stand-alone document primarily intended for programmers, analysts, and spec writers. The Version 53 Summary includes 7 items of change, addressing the addition of new data elements (Percent Originating Usage, Uncompensated Mileage), several new phrase codes, and clarifications. Version 53 becomes effective September 2013.