The Special Edition of the Healthcare Analytics in Navy Medicine is an annual addition to each Volume that began in FY 2017 and provides a succinct and contextual overview of notable changes and implementations over the last fiscal year in Military Health System (MHS)/TRICARE policy, benefits, data, and analytic training offerings. The purpose of the Special Edition is to be a useful, but not exhaustive, resource to analysts and decision-makers who use MHS data for decision support, especially when providing trend analysis or conducting multiyear studies.