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Defense Health Agency

"On October 1, 2013, the Department of Defense established the Defense Health Agency (DHA) to manage the activities of the Military Health System. These activities include those previously managed by TRICARE Management Activity (TMA), which was disestablished on the same date. During the next several months, all TMA websites will change to reflect the new DHA. We appreciate your patience during this transition."

Functional Specifications

DHCAPE is responsible for the Functional Specifications of the MHS Data Repository (MDR) and MHS Mart (M2). For each functional specification there may be two accessible versions at any one time. The Current System version documents the specific file as it currently exists. If present, the Future System version documents the file as it will be once proposed changes are implemented. Once those changes have been implemented, the Future System version will be reclassified as the Current System version.

Each specification is assigned a status that reflects its level of permanence. Preliminary is a draft designation that identifies a working document to which further changes are anticipated. Final is also a draft designation that indicates that the file is not likely to change.

The files available here are the most current versions of a document. The repository is updated as new versions are released. If you have any questions or need access to an older version of a specification, please email the functional specifications manager at

Select the link located to the left of the MHS system specification or ICD you'd like to view.

Data Dictionaries or Alerts
Select the link below for the MHS system data dictionary or alert you'd like to view.

M2 Alerts
M2 Data Dictionary
MDR Alerts
MDR Data Dictionary
MDR Users Guide
MDR Functional Guide

MDR Functional Specifications

M2 Functional Specifications

Interface Control Documents (ICDs)